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bigtreetech / BIGTREETECH-SKR-PRO-V1.1

Aiming at some problems existing in 3D printed motherboards in the market. Bigtree Technology Co., Ltd. launched a high performance 3D printer master board with STM32F407ZGT6 as the core controller, BIGTREETECH-SKR-PRO-V1.1.
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E3D Thermocoule E1 Thermal Runaway #23

Open hopeinformer opened 5 years ago

hopeinformer commented 5 years ago

I'm not sure if this is a bug or operator error. I have tried many combinations of setting up the thermocouple for the E3D V6 hotend on the Bigtreeteck MKR Pro board. I am using the thermocouple amplifier board and reassigned the pin for Temp Sensor 0 in the PINS.h to use one of the Expansion pins (PF8). I also tried to use the original sensor 0 pin (PF4) but none of these work. I followed the E3D instructions found here: https://reprap.org/wiki/ExtThermoCouple_1.0

AnHardt commented 5 years ago

Neither nor. This part of Marlin was never ported to 3.3V processors.

This module needs 5V to work - 3.3V is not enough. It also will produce up to 5V at its output. 5V is to much for the 3.3 processors and will destroy the processors ADC.

Using this Modules with 3.3V processors is not a good idea!

Even if we ignore that problem and never exceed 330°C and for that stay below 3.3V we do need an other table because now not 5V is 500°C == 1023ADC, but 3.3V is 330°C == 1023ADC.

Haschtl commented 5 years ago

I have the same Problem with my E3d Pt100 amplifier Board. I will supply this Board with 5V and add a voltage divider to the output, that the maximum output voltage is 3,3V. As I know, we wouldnt need to modify the LUT... But maybe i'm wrong. Anyway I will calibrate my thermistors manually and adjust the lookuptable, so thats Not a Real Problem for me

hopeinformer commented 5 years ago

Thank you for your comments AnHardt and Haschtl. Based on that feedback, I'll stick with the traditional thermistor and forget about the higher temperatures until this gets worked out.

evandene commented 5 years ago

I have the same Problem with my E3d Pt100 amplifier Board. I will supply this Board with 5V and add a voltage divider to the output, that the maximum output voltage is 3,3V. As I know, we wouldnt need to modify the LUT... But maybe i'm wrong. Anyway I will calibrate my thermistors manually and adjust the lookuptable, so thats Not a Real Problem for me

Dear Haschtl, I have the same problem but because I'm quite a hardware dummy, could you please explain how you installed the E3D PT100 sensors and the amplifier board to the SKR Pro v1.1? What pins are you using for hooking up the amplifier(s) I have two extruders and two hot-ends

tphan26363 commented 5 years ago

I did have the same problem with PT100 amp. How ever this happen to all other hardware as well since the rail voltages of all chips are not the same. For all 32 bit some of them max out and 3.2 V some of them is 3.25V ect. So the PT100 board can not really adapt to all of them. It just an analog amplification so it is not accurate to scale with an AD converter. I just use the 3.3V as the VCC for the PT100( it's ok the chip could works at much lower voltages) and compensate for the different of the AD voltage range(3.0 for some chip mine is 3.2V) by multiply the temperature table to a 3.2/3.3V ratio( you must look at the data sheet of your chip to find out max Voltage for you AD converter). Or you can use 100 ohm resistor reference to recalculate the table. Practically it is easier to use a buck converter to lower the 5V to 3.3V to PT100 board and adjust until you read correctly ADC values

hopeinformer commented 5 years ago

Thank you tphan26363. That's the most helpful information on these PT100 and amp board. I will use the buck converter. Which pins are best used for this on the Pro v1.1?

tphan26363 commented 5 years ago

Just use the existing pin for e0. it has a pull up resistor but should not affecting the PT100 much since the board should be able to dive much more current than that

On Sun, Oct 6, 2019 at 2:45 PM hopeinformer notifications@github.com wrote:

Thank you tphan26363. That's the most helpful information on these PT100 and amp board. I will use the buck converter. Which pins are best used for this on the Pro v1.1?

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evandene commented 5 years ago

For your information: I use MARLIN 2.0 from BIGTREE-TECH because of some pin and stepper corrections. https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1

It works, ... BUT do not connect the amplifier output signal with the thermistor input E1, E2, etc .. my board froze up.

I use E3D PT100 sensor and E3D amplifier. Will change this later by a Adafruit amplifier because of the 5V input and the 3.3V output signal of the board. T0 is responding on my E3D amplifier with PT100 sensor I use PF8 from EXTENSION1 as signal pin. I use GND and 3.3V from a free limit switch connector.

settings in configuration.h

define TEMP_SENSOR_0 20

define TEMP_SENSOR_1 20

PIN settings in: Amplifier signal pins

adafruit amplifier

tphan26363 commented 5 years ago

That does not sound right. Froze up when connect the amp to the T0 input? I think it can't froze up when connect the amp board to the T0 input. Unless your amp board is freaking weird. But I think it more like a firmware reaction to shutdown the board when it received weird temperature reading from the amp board. I have no problem with mine what so ever. The Adafruit look good to me because it does have a part number Max31865 and clear label to the board. That can help . But for me I think this board is totally different from the amp board mine you. This is actually is a A-D converter not an amp board. The T0 and T1 actually is a analog input so I don't know how you can configure it. But it probably that you have to change it to a digital input instead. Good luck.

On Mon, Oct 7, 2019 at 11:00 PM Ed van den Enden notifications@github.com wrote:

For your information: I use MARLIN 2.0 from BIGTREE-TECH because of some pin and stepper corrections. https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1

It works, ... BUT do not connect the amplifier output signal with the thermistor input E1, E2, etc .. my board froze up.

I use E3D PT100 sensor and E3D amplifier. Will change this later by a Adafruit amplifier because of the 5V input and the 3.3V output signal of the board. T0 is responding on my E3D amplifier with PT100 sensor I use PF8 from EXTENSION1 as signal pin. I use GND and 3.3V from a free limit switch connector Do not forget to change pin settings in the: [image: Amplifier signal pins] https://user-images.githubusercontent.com/8578321/66370509-d939e500-e9a0-11e9-90e7-655c2f4c5d98.JPG

[image: adafruit amplifier] https://user-images.githubusercontent.com/8578321/66370587-13a38200-e9a1-11e9-9bd9-9236b0a5f618.JPG

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evandene commented 5 years ago

T0 is NOT responding on my E3D amplifier with PT100 sensor I use PF8 from EXTENSION1 as signal pin. I use GND and 3.3V from a free limit switch connector. In pins_BIGTREE_SKR_PRO_V1.1.h re-asign the pin number(s) PF8

settings in configuration.h

define TEMP_SENSOR_0 20

define TEMP_SENSOR_1 20

ALL Works fine now. I installed also my second extruder and hot-end. I also have my WiFi working Good luck

emilhse commented 5 years ago

T0 is NOT responding on my E3D amplifier with PT100 sensor I use PF8 from EXTENSION1 as signal pin. I use GND and 3.3V from a free limit switch connector. In pins_BIGTREE_SKR_PRO_V1.1.h re-asign the pin number(s) PF8

settings in configuration.h

define TEMP_SENSOR_0 20

define TEMP_SENSOR_1 20

ALL Works fine now. I installed also my second extruder and hot-end. I also have my WiFi working Good luck

Can you please explain what changes you made in pins_BIGTREE_SKR_PRO_V1.1.h? What pins did you reassign?

emilhse commented 4 years ago

That does not sound right. Froze up when connect the amp to the T0 input? I think it can't froze up when connect the amp board to the T0 input. Unless your amp board is freaking weird. But I think it more like a firmware reaction to shutdown the board when it received weird temperature reading from the amp board. I have no problem with mine what so ever. The Adafruit look good to me because it does have a part number Max31865 and clear label to the board. That can help . But for me I think this board is totally different from the amp board mine you. This is actually is a A-D converter not an amp board. The T0 and T1 actually is a analog input so I don't know how you can configure it. But it probably that you have to change it to a digital input instead. Good luck. … On Mon, Oct 7, 2019 at 11:00 PM Ed van den Enden @.***> wrote: For your information: I use MARLIN 2.0 from BIGTREE-TECH because of some pin and stepper corrections. https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1 It works, ... BUT do not connect the amplifier output signal with the thermistor input E1, E2, etc .. my board froze up. I use E3D PT100 sensor and E3D amplifier. Will change this later by a Adafruit amplifier because of the 5V input and the 3.3V output signal of the board. T0 is responding on my E3D amplifier with PT100 sensor I use PF8 from EXTENSION1 as signal pin. I use GND and 3.3V from a free limit switch connector Do not forget to change pin settings in the: [image: Amplifier signal pins] https://user-images.githubusercontent.com/8578321/66370509-d939e500-e9a0-11e9-90e7-655c2f4c5d98.JPG [image: adafruit amplifier] https://user-images.githubusercontent.com/8578321/66370587-13a38200-e9a1-11e9-9bd9-9236b0a5f618.JPG — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#23?email_source=notifications&email_token=AMXYTRGFD4AJN67IWNNOJW3QNQOZDA5CNFSM4IJFILN2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEAS46NI#issuecomment-539348789>, or mute the thread https://github.com/notifications/unsubscribe-auth/AMXYTRDQ6Q3PZN2MKZSL24TQNQOZDANCNFSM4IJFILNQ .

Can you please share, what amplifier board you used, and which pins you used?

AnHardt commented 4 years ago

The Tx connectors are made for comparing a thermistors resistance to a on-board 4K7 pull-up resistor.

The E3d Pt100 amplifier Boards have an proportional to the temperature voltage at their output. You can connect them to the T connectors, but the measured temperature will be wrong because the pull up resistor changes the measured voltage. Better connect them to a ADC-pin with no pull-up resistor.

The MAX31865 are completely different and connected to a SPI-bus. They have an ADC on board.

evandene commented 4 years ago

The Adafruit PT100 board do work fine for me as well as the E3D Pt100 board

emilhse commented 4 years ago

Thank you very much guys. Did anyone tried connecting max31865? If yes how? I'm quite dummy in all of this .And which board is more accurate? The reason I'm asking because I have no choice, I have built pellet extruder which needs accurate and stable temperature. I can of course use external temperature regulator but I want to control directly from the board. Thanks in advance

emilhse commented 4 years ago

The Adafruit PT100 board do work fine for me as well as the E3D Pt100 board

What type of stepper drivers do you use , do you use spi for them at the same time?

evandene commented 4 years ago

The Adafruit PT100 board do work fine for me as well as the E3D Pt100 board

What type of stepper drivers do you use , do you use spi for them at the same time?

Okay, Please find my configuration file, my configuration_adv and my pins_BIGTREE_SKR_PRO_V1,1 file. I us TMC5160 drivers. The pins file need to be renamed as ........ V1.1

configuration.txt configuration_adv.txt pins_BIGTREE_SKR_PRO_V11.txt

emilhse commented 4 years ago

thank you very much sir. in your config file it says PF9 for temprature sensor. but in your comment it says PF8. that what i was wondering because in pins as per diagram for the board if Im not mistaken PF8 is spi pin.

emilhse commented 4 years ago

do i need to remove pull up resistor?

evandene commented 4 years ago

PF9 will be okay

emilhse commented 4 years ago

thanks

AnHardt commented 4 years ago

do i need to remove pull up resistor?

You could - but using any of these ADC-pins is much easier.

image

evandene commented 4 years ago

It's Extension 1 on the board For two PT100 boards I used PF8 and PF9 For Power module I used GND, 5V and PC9

EXTENSION 1 on the board

Power module SKR Pro v1 1 wirering configuration h pins_BIGTREE_PRO_V11

emilhse commented 4 years ago

thank you very much guys for great support

johnny49r commented 4 years ago

Hi, You can use the E3D PT100 board without modification on the BigTreeTech boards but should work for other 3.3V / 32 bit controllers. First you need to run the E3D board at 3.3V since the BTT analog inputs are not 5V tolerant. The E3D PT100 [INA826] amp will run fine down to 3V. Second you will need to compile the Marlin FW with the attached thermistor_22.h file. This has correct translation for 3.3V operation and also offset caused by the 4.7K pullup on the BTT thermistor inputs. Limitations: Due to the limited voltage swing of the amplifier at 3.3V the max temperature it can report is approx 360 C but I think that is useful for most folks. Please see the attached file for more details. You will need to change the file extension from .txt to .h. thermistor_22.txt

TheMiguelBi commented 4 years ago

Hi, You can use the E3D PT100 board without modification on the BigTreeTech boards but should work for other 3.3V / 32 bit controllers. First you need to run the E3D board at 3.3V since the BTT analog inputs are not 5V tolerant. The E3D PT100 [INA826] amp will run fine down to 3V. Second you will need to compile the Marlin FW with the attached thermistor_22.h file. This has correct translation for 3.3V operation and also offset caused by the 4.7K pullup on the BTT thermistor inputs. Limitations: Due to the limited voltage swing of the amplifier at 3.3V the max temperature it can report is approx 360 C but I think that is useful for most folks. Please see the attached file for more details. You will need to change the file extension from .txt to .h. thermistor_22.txt

Thanks for this info johnny49r ! I am trying to operate my PT100 amplifier. But I use another card, BTT GTR v1.0 The no-load measurement is 31°C, when it should measure 20-21°C. I am feeding the electronics with a powerbank via USB. The power supply of the amplifier is not 3.3v but slightly lower (3.25v).

Something escapes me .....

johnny49r commented 4 years ago

Hi,

Please verify that you are using this PT100 amplifier: https://wiki.e3d-online.com/E3D_PT100_Amplifier_Documentation#Schematic This works fine with the BTT V1.3/V1.4 boards.

I couldn't find a schematic for the BTT GTR board but the thermistor table calculation assumes that the thermistor analog input has a 4.7K ohm pullup to VCC (in your case 3.25V). If the pullup value is different this would account for the discrepancy.

I have attached the THERMISTOR_22.h file and it shows the calculations for the Marlin lookup table using a PT100 temperature vs resistance chart as described here: http://www.manoraz.com/_Uploads/dbsAttachedFiles/PT-100_Table.pdf

The Marlin lookup table has data points for every 10 degrees C associating raw ADC values for each point. Finer resolution is derived by interpolation. I hope this helps. Please let me know if you need further info.

John

On Mon, Apr 13, 2020 at 11:09 PM TheMiguelBi notifications@github.com wrote:

Hi, You can use the E3D PT100 board without modification on the BigTreeTech boards but should work for other 3.3V / 32 bit controllers. First you need to run the E3D board at 3.3V since the BTT analog inputs are not 5V tolerant. The E3D PT100 [INA826] amp will run fine down to 3V. Second you will need to compile the Marlin FW with the attached thermistor_22.h file. This has correct translation for 3.3V operation and also offset caused by the 4.7K pullup on the BTT thermistor inputs. Limitations: Due to the limited voltage swing of the amplifier at 3.3V the max temperature it can report is approx 360 C but I think that is useful for most folks. Please see the attached file for more details. You will need to change the file extension from .txt to .h. thermistor_22.txt https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1/files/4343517/thermistor_22.txt

Thanks for this info johnny49r ! I am trying to operate my PT100 amplifier. But I use another card, BTT GTR v1.0 The no-load measurement is 31°C, when it should measure 20-21°C. I am feeding the electronics with a powerbank via USB. The power supply of the amplifier is not 3.3v but slightly lower (3.25v).

Something escapes me .....

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johnny49r commented 4 years ago

Hi,

Sorry, one small detail I might have forgotten to mention: You need to add the following text to the thermistors.h file located in the Marlin/src/module/thermistor directory:

if ANY_THERMISTOR_IS(22) // Pt100 with E3D amp @ 3.3v w/4.7K pullup

(BigTreeTech, etc.). Abbycus 2020

include "thermistor_22.h"

endif

Also make sure the thermistor_22.h file is installed in that same directory.

Then recompile with the latest Marlin 2.0.x bugfix.

Good luck!

On Tue, Apr 14, 2020 at 8:52 AM John Hoeppner johncom2k@gmail.com wrote:

Hi,

Please verify that you are using this PT100 amplifier: https://wiki.e3d-online.com/E3D_PT100_Amplifier_Documentation#Schematic This works fine with the BTT V1.3/V1.4 boards.

I couldn't find a schematic for the BTT GTR board but the thermistor table calculation assumes that the thermistor analog input has a 4.7K ohm pullup to VCC (in your case 3.25V). If the pullup value is different this would account for the discrepancy.

I have attached the THERMISTOR_22.h file and it shows the calculations for the Marlin lookup table using a PT100 temperature vs resistance chart as described here: http://www.manoraz.com/_Uploads/dbsAttachedFiles/PT-100_Table.pdf

The Marlin lookup table has data points for every 10 degrees C associating raw ADC values for each point. Finer resolution is derived by interpolation. I hope this helps. Please let me know if you need further info.

John

On Mon, Apr 13, 2020 at 11:09 PM TheMiguelBi notifications@github.com wrote:

Hi, You can use the E3D PT100 board without modification on the BigTreeTech boards but should work for other 3.3V / 32 bit controllers. First you need to run the E3D board at 3.3V since the BTT analog inputs are not 5V tolerant. The E3D PT100 [INA826] amp will run fine down to 3V. Second you will need to compile the Marlin FW with the attached thermistor_22.h file. This has correct translation for 3.3V operation and also offset caused by the 4.7K pullup on the BTT thermistor inputs. Limitations: Due to the limited voltage swing of the amplifier at 3.3V the max temperature it can report is approx 360 C but I think that is useful for most folks. Please see the attached file for more details. You will need to change the file extension from .txt to .h. thermistor_22.txt https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1/files/4343517/thermistor_22.txt

Thanks for this info johnny49r ! I am trying to operate my PT100 amplifier. But I use another card, BTT GTR v1.0 The no-load measurement is 31°C, when it should measure 20-21°C. I am feeding the electronics with a powerbank via USB. The power supply of the amplifier is not 3.3v but slightly lower (3.25v).

Something escapes me .....

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1/issues/23#issuecomment-612965892, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEY4LQ3CS4JYMMLGC6CIGZTRMM2LVANCNFSM4IJFILNQ .

Symbyos83 commented 4 years ago

Hi, Sorry, one small detail I might have forgotten to mention: You need to add the following text to the thermistors.h file located in the Marlin/src/module/thermistor directory: #if ANY_THERMISTOR_IS(22) // Pt100 with E3D amp @ 3.3v w/4.7K pullup (BigTreeTech, etc.). Abbycus 2020 #include "thermistor_22.h" #endif Also make sure the thermistor_22.h file is installed in that same directory. Then recompile with the latest Marlin 2.0.x bugfix. Good luck! …

Hi johnny49r, I have found perhaps the problem that says TheMiguelBi, in the GTR wiring diagram there is a 22 ohm resistor in series, perhaps it is what creates temperature differences ...

Schermata 2020-04-14 alle 10 01 04
johnny49r commented 4 years ago

Hi symbyos83,

The 22 ohm shouldn't make any difference since it is connected to the ADC input which is high impedance. The 22 ohm resistor and the two diodes are there to protect the analog input from incorrect voltages that could damage the chip but normally there is almost no current flow through the resistor. Maybe TheMiguelBi might be using a different PT100 amplifier or perhaps he forgot to compile the firmware using my lookup table (thermistor_22.h). If the lookup table is wrong I can make another if I know what the PT100 amp circuit looks like.

Thanks, John

On Tue, Apr 14, 2020 at 3:02 PM Symbyos83 notifications@github.com wrote:

Hi, Sorry, one small detail I might have forgotten to mention: You need to add the following text to the thermistors.h file located in the Marlin/src/module/thermistor directory: #if ANY_THERMISTOR_IS(22) // Pt100 with E3D amp @ 3.3v w/4.7K pullup (BigTreeTech, etc.). Abbycus 2020

include "thermistor_22.h" #endif Also make sure the thermistor_22.h file

is installed in that same directory. Then recompile with the latest Marlin 2.0.x bugfix. Good luck! … <#m-3600559256599146838>

Hi johnny49r, I have found perhaps the problem that says TheMiguelBi, in the GTR wiring diagram there is a 22 ohm resistor in series, perhaps it is what creates temperature differences ... [image: Schermata 2020-04-14 alle 10 01 04] https://user-images.githubusercontent.com/31854600/79200528-e0055100-7e36-11ea-91fd-38745e3a4675.png

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tiros76 commented 4 years ago

@johnny49r

Man, a huge thanks to you for sharing this! I was initially having the same issue with my SKR1.4 Turbo as @TheMiguelBi was with my E3D pt100 board and your thermistor_22.h file and thermistor.h edit. I was consistently showing 7 degrees over ambient with the PT100 powered from the 3.3v rail. So per tphan's idea, I decided to use an adjustable buck converter connected to Vin to tune the supply voltage until I was getting correct temp. the PT100 board seems to be incredibly sensitive to variations in the 3.3v supply voltage.

I pulled Vin (in my case 12v) from one of the extra always-on fan headers on the SKR1.4. Connected the 12v supply to the input on the buck converter and output to the PT100 board. You will need to tune the converter before you wire it up to avoid torching the thermistor inputs. I my case I just attached the converter to a benchtop power supply (you can use Vin) and adjusted until I had exactly 3.3v on the output. From there I connected it up to the printer and tweaked in real time so that it matched ambient on the LCD. All it took was around 0.03v to bring it into spec.

Confirmed accuracy with a K-type thermocouple stuffed under the silicone sock. Compared and verified the temps from 80-220C to an identical hotend setup measured in the exact same fashion. The readings were spot on.

I got the adjustable buck converter from amazon. just search Mini MP1584EN DC-DC Buck Converter

Not sure if this is the safest setup considering the source of the 3.3 volts, although it seemed very steady on my meter. Perhaps someone else has a better idea for a cleaner power source for the PT100 board since the 3.3v from the SKR1.4 was not working.

Hopefully this provides something helpful. I will update when I get around to clearing out the PLA and testing to a higher temp with this setup.

panecki commented 4 years ago

Hi, does anyone have a working version 2.0.5.3(skr pro 1.1) with the MAX31865 amplifier? I've been working on the launch for several days and I'm still getting Err MAXTEMP: E1. I've also tested MAX31855 and MAX6675 I get the same error everywhere.

GadgetAngel commented 4 years ago

Hi, does anyone have a working version 2.0.5.3(skr pro 1.1) with the MAX31865 amplifier? I've been working on the launch for several days and I'm still getting Err MAXTEMP: E1. I've also tested MAX31855 and MAX6675 I get the same error everywhere.

I would like this information also

GadgetAngel commented 4 years ago

When using 21 as the setting for TEMP_SENSOR_0 in Configuration.h for Marlin 2.0.x, is the 4.7K ohm resistor on the T1 (E0) port taken into account when using this table at 3.3VDC (with PT100 and PT100 amplifier board)?

johnny49r commented 4 years ago

Hi,

Please check here: https://github.com/johnny49r/BigTreeTech

The calculated table is for the E3D PT100 amp using the INA826 which has a diff gain of 10. You can modify the calculations to create your own thermistor table. Please let me know if you need help. John H

On Tue, Jul 28, 2020 at 12:07 PM GadgetAngel notifications@github.com wrote:

When using 21 as the setting for TEMP_SENSOR_0 in Configuration.h for Marlin 2.0.x, is the 4.7K ohm resistor on the T1 (E0) port taken into account when using this table at 3.3VDC (with PT100 and PT100 amplifier board)?

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GadgetAngel commented 4 years ago

Hi, Please check here: https://github.com/johnny49r/BigTreeTech The calculated table is for the E3D PT100 amp using the INA826 which has a diff gain of 10. You can modify the calculations to create your own thermistor table. Please let me know if you need help. John H … On Tue, Jul 28, 2020 at 12:07 PM GadgetAngel @.***> wrote: When using 21 as the setting for TEMP_SENSOR_0 in Configuration.h for Marlin 2.0.x, is the 4.7K ohm resistor on the T1 (E0) port taken into account when using this table at 3.3VDC (with PT100 and PT100 amplifier board)? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEY4LQ4U2BDRZZTHZZYVOYDR5ZMKPANCNFSM4IJFILNQ .

@johnny49r In the newest version of Marlin 2.0.6 they added new temperature sensor tables to the firmware. You use table number 22 when setting up your table. Why not change your table number to 222?

Marlin version 2.0.6's definitions for PT100:

Newest edition to temperature sensor tables (but these do not affect PT100 sensor they just use number 22 and 23 and are for 100k Thermistor sensors):

BUT, Is my current understanding of these tables correct?

This is my current understanding:

Why doesn't Marlin make another table number, which is permanently installed in Marlin, for those of us that have spare analog input pins that are ONLY 3.3VDC tolerant and have a 4.7k Ohm pull up resistor wired to the MCU's port? To create your own table and install it in Marlin is somewhat advanced for most Marlin users.

For SKR PRO V1.1 board I have see four option in the current version of Marlin for attaching PT100 sensor to the 32-bit MCU:

Does this make sense? or am I totally wrong on this information? If I am wrong please someone point out why I am wrong.

Please assume I know that I have to change the TEMP_SENSOR_0 marlin variable and the TEMP_0_PIN in the pins file of the MCU.

Also please assume that I know I need to add the following to the pins file if I chose to use the MAX31865 amplifier board:

// For Software SPI on SKR PRO V1.1 board
// TEMP_0_PIN set to PE2 and TEMP_SENSOR_0 set to -5
#ifndef MAX31865_CS_PIN
  #define MAX31865_CS_PIN TEMP_0_PIN
  #define MAX6675_SS_PIN MAX31865_CS_PIN   
  #define MAX31865_MOSI_PIN PD2
  #define MAX31865_MISO_PIN PD5
  #define MAX31865_SCK_PIN PE0
#endif
johnny49r commented 4 years ago

Hi GadgetAngel,

The project I put on Github describes using the E3D PT100 amplifier with the BTT board. This is a bit different than using the MAX31865 board. The E3D PT100 amplifier has an analog output and is read by the ADC on the BTT board whereas the MAX31865 provides temperature information digitally through the SPI serial bus. It seems that Marlin firmware has a 'thermistor' option for the MAX31865 board which I believe is -5. I'm not sure how to wire the MAX31865 to the BTT board but there is an SPI bus available on the EXP2 connector. I hope this helps. John

On Thu, Jul 30, 2020 at 2:01 AM GadgetAngel notifications@github.com wrote:

Hi, Please check here: https://github.com/johnny49r/BigTreeTech The calculated table is for the E3D PT100 amp using the INA826 which has a diff gain of 10. You can modify the calculations to create your own thermistor table. Please let me know if you need help. John H … <#m5539978699344400732> On Tue, Jul 28, 2020 at 12:07 PM GadgetAngel @.***> wrote: When using 21 as the setting for TEMP_SENSOR_0 in Configuration.h for Marlin 2.0.x, is the 4.7K ohm resistor on the T1 (E0) port taken into account when using this table at 3.3VDC (with PT100 and PT100 amplifier board)? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23 (comment) https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1/issues/23#issuecomment-664779528>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEY4LQ4U2BDRZZTHZZYVOYDR5ZMKPANCNFSM4IJFILNQ .

@johnny49r https://github.com/johnny49r In the newest version of Marlin 2.0.6 they added new temperature sensor tables to the firmware. You use table number 22 when setting up your table. Why not change your table number to 222?

Marlin version 2.0.6's definitions for PT100:

  • -5 : PT100 / PT1000 with MAX31865 (only for sensors 0-1)
  • 20 : Pt100 with circuit in the Ultimainboard V2.x with 5v excitation (AVR)
  • 21 : Pt100 with circuit in the Ultimainboard V2.x with 3.3v excitation (STM32 \ LPC176x....)
  • 201 : Pt100 with circuit in Overlord, similar to Ultimainboard V2.x
  • 147 : Pt100 with 4k7 pullup
  • 110 : Pt100 with 1k pullup (non standard)

Newest edition to temperature sensor tables (but these do not affect PT100 sensor they just use number 22 and 23 and are for 100k Thermistor sensors):

  • 22 : 100k (hotend) with 4.7k pullup to 3.3V and 220R to analog input (as in GTM32 Pro vB)
  • 23 : 100k (bed) with 4.7k pullup to 3.3v and 220R to analog input (as in GTM32 Pro vB)

BUT, I am confused, what are the differences between table 20, table 21, table 201, table 147 and table 110 beyond the obvious pull-up resistors? What is table 201 used for?? What does "with circuit in Overlord" mean? This is my current understanding:

  • I should use table -5 if I am using a PT100 sensor attached to the MAX31865 board and the SPI bus.
  • I should use table 20 when I use a PT100 sensor attached to a PT100 amplifier board that use 5VDC as its input voltage and is wired up to an 8-bit MCU's analog input PIN which is 5VDC tolerant and has 0 Ohm pull-up resistor in the MCU's connected port.
  • I should use table 21 when I use a PT100 sensor attached to a PT100 amplifier board that uses 3.3VDC as its input voltage and is wired up to a 32-bit MCU's analog input PIN which is 3.3VDC tolerant and has 0 Ohm pull-up resistor in the MCU's connected port.
  • I use table 147 when I use a PT100 sensor attached to a PT100 amplifier board that uses 5VDC as its input voltage and is wired up to an 8-bit MCU's analog input PIN which is 5VDC tolerant and has a 4.7k pull-up resistor in the MCU's connected port.
  • I use table 110 when I use a PT100 sensor attached to a PT100 amplifier board that use 5VDC as it input voltage and is wired up to an 8-bit MCU analog input PIN which is 5VDC tolerant and has a 1k Ohm pull-up resistor in the MCU's connected port.
  • I use a table I created, say number 222 (@johnny49r https://github.com/johnny49r suggestion), if I use a PT100 sensor attached to a PT100 amplifier board that uses 3.3 VDC as it input voltage and is wired up to a 32-bit MCU analog input PIN which is 3.3VDC tolerant and has a 4.7K pull-up resistor in the MCU's connected port.

Is my understanding correct? If so, why doesn't Marlin make another table number that is permanently installed in Marlin for those of us that have moved over to 32-bit MCUs who's spare analog input pins are ONLY 3.3VDC tolerant and have 4.7k pull up resistor on the thermistor ports? To create your own table and install it in Marlin is somewhat advanced for most Marlin users. For 32-bit MCU's I have see four option in the current version of Marlin for attaching PT100 sensor to the 32-bit MCU:

  • Option number 1: Use table 21 and attached the PT100 amplifier board to a spare analog pin, but wire up 3.3VDC referenced to the MCU's digital ground (GND) to power the PT100 amplifier board and use GND to ground the PT100 amplifier board.
  • Option number 2: Use table -5 an attached the PT100 sensor to the MAX31865 board which uses the SPI bus. But this type of connection tends to be noisier compared to the analog connection via the ADC input.
  • Option number 3: Use table 21 and attach the PT100 amplifier board to the hacked thermistor port. The hack would mean I removed the thermistor port's resistor and capacitor and tapped into the 3.3VDC side of the thermistor's port resistor to gain access to the 3.3VDC that is reference to the 32-bit MCU's analog ground (Analog_GND). Now I use the 3.3VDC referenced to Analog_GND to power my PT100 amplifier and wire the thermistor port's Analog_GND PIN to the PT100 amplifier board. Now I do not have a ground loop problem and I have noise immunity.
  • Option number 4: I create a new table called number 222 and follow @johnny49r https://github.com/johnny49r instructions for adding this new 222 table to Marlin. But this time I do not need to hack the thermistor port. This new table 222 would allow me to wire up the PT100 sensor to a PT100 amplifier board and attach the PT100 amplifier board to a thermistor port which has a 4.7k Ohm pull-up resistor. I must still use the 3.3VDC from another location on the MCU board to power my PT100 amplifier board (this 3.3VDC would NOT be reference to Analog_GND). Also, I must use the GND connection (NOT Analog_GND) on the MCU to ground my PT100 amplifier board. This type of connection can still be noisier than the option number 3 above.

Does this make sense? or am I totally wrong on this information? If I am wrong please someone point out why I am wrong. Please assume I know that I have to change the TEMP_SENSOR_0 marlin variable and the TEMP_0_PIN in the pins file of the MCU. Also please assume that I know I need to add the following to the pins file if I chose to use the MAX31865 amplifier board:

ifndef MAX31865_CS_PIN

define MAX31865_CS_PIN TEMP_0_PIN

define MAX6675_SS_PIN MAX31865_CS_PIN

define MAX31865_MOSI_PIN TMC_SW_MOSI

define MAX31865_MISO_PIN TMC_SW_MISO

define MAX31865_SCK_PIN TMC_SW_SCK

endif

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GadgetAngel commented 4 years ago

@johnny49r Thanks for the input.

EDIT: Since SPI is not working with analog ADC inputs (it is completely digital) whether or not the I/O line has a resistor in series with the I/O line is not a concern. I write these things out to keep them straight in my own mind.

You could use it on the thermistor port. You would then use the thermistor port pin name as TEMP_0_PIN. Set TEMP_SENSOR_0 to -5 and set in configuration_adv.h enable TMC_USE_SW_SPI line. Then include the following in your pins_file for your processor (this way uses Software SPI): 

 #ifndef MAX31865_CS_PIN
    #define MAX31865_CS_PIN TEMP_0_PIN
    #define MAX6675_SS_PIN MAX31865_CS_PIN
    #define MAX31865_MOSI_PIN TMC_SW_MOSI
    #define MAX31865_MISO_PIN TMC_SW_MISO
    #define MAX31865_SCK_PIN TMC_SW_SCK
#endif

If you want Hardware SPI you would have to use the true SPI CLK pin, SPI MOSI pin, SPI MISO pin (on EXP2 connector) and set the thermistor port pin name as TEMP_0_PIN. Set TEMP_SENSOR_0 to -5 and then include the following in your pins_file for your processor (this way uses Hardware SPI):

 #ifndef MAX31865_CS_PIN
  #define MAX31865_CS_PIN TEMP_0_PIN
  #define MAX6675_SS_PIN MAX31865_CS_PIN
#endif

What I am trying to figure out now is why would I use the hardware SPI over the Software SPI on a 3D printer?

@johnny49r, Yes, I see your point about the SKR V1.4 board. You would be hard pressed to find 4 free I/O lines on the SKR V1.4 board to use for Software SPI. So on the SKR V1.3/SKR V1.4/SKR V1.4 Turbo making a custom cable to the EXP2 port would be your only reasonable option. But for the SKR PRO V1.1 board you have EXTENSION-1 and EXTENSION-2 headers which give you more than enough free I/O pins so setting up Software SPI would be the easier option.

johnny49r commented 4 years ago

Hi GadgetAngel,

I had a quick look at the BTT SKR 1.4 schematic and it looks like EXP2 is the only choice for connecting any external SPI devices. If you are using a display you would need to make a custom cable that would break out the SPI signals from the EXP2 connector. The SPI bus on the EXP2 is one of two hardware SPI buses from the CPU and hopefully Marlin firmware can resolve which is which. Also, software bit-banging isn't needed since the SPI bus on EXP2 is a hardware SPI bus.

Another option you might consider is to use a standard thermistor but if you need temperatures greater than about 270C they won't work for you. Yet another choice would be to use an analog PT100 amplifier (like the E3D board) and deal with making an analog thermistor lookup table. This was the option I chose, mainly because I already had the E3D board. Keep in mind that absolute accuracy of temperature measurement isn't all that important to 3D printing. What is important is consistent and stable measurement.

BTT documentation is poor (understatement?) and things like PT100 support isn't on their radar.

Regards, John

On Fri, Jul 31, 2020 at 2:25 PM GadgetAngel notifications@github.com wrote:

@johnny49r https://github.com/johnny49r Thanks for the input. What I am trying to figure out now is why would I use the hardware SPI over the Software SPI on a 3D printer?

  • I have searched with google about MAX31855 (thermocouple amplifier via SPI) and MAX31865 (PT100 amplifier via SPI) and a lot of users are using the hardware SPI option to connect up their amplifier boards. Why?

I tell myself this: "The rise in temperature on a 3D printer is not faster than the 32-bit processor so SPI protocol implemented by software (bit-banging) is good enough".

-

With the hardware SPI option you MUST find the SPI MISO, SPI MOSI, and SPI CLK lines for the SPI bus (to tap into). Like you said you could use the EXP2 port. But, if you are using the EXP2 port for a display you will now have to create a custom cable for the EXP2 port so you can still get access to the SPI CLK line and SPI MOSI and SPI MISO lines.

But if you use Software SPI you can use any free digital I/O pins and assign them to be the SPI CLK, SPI MOSI, SPI MISO lines and the CS line. Software SPI will not run as fast as the hardware SPI but the change in temperature does not occur in less than a second. On a 32-bit processor slow is really not that slow anymore.

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johnny49r commented 4 years ago

Hi,

Maybe it's a typo? They might mean "circuit in overload" which doesn't make a lot of sense either. Sorry but I can't be much help there.

John

On Fri, Jul 31, 2020 at 8:54 PM GadgetAngel notifications@github.com wrote:

Marlin version 2.0.6's definitions for PT100:

  • -5 : PT100 / PT1000 with MAX31865 (only for sensors 0-1)
  • 20 : Pt100 with circuit in the Ultimainboard V2.x with 5v excitation (AVR)
  • 21 : Pt100 with circuit in the Ultimainboard V2.x with 3.3v excitation (STM32 \ LPC176x....)
  • 201 : Pt100 with circuit in Overlord, similar to Ultimainboard V2.x
  • 147 : Pt100 with 4k7 pullup
  • 110 : Pt100 with 1k pullup (non standard)

What is table 201 used for? What does "with circuit in Overlord" mean?

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GadgetAngel commented 4 years ago

Hi, Maybe it's a typo? They might mean "circuit in overload" which doesn't make a lot of sense either. Sorry but I can't be much help there. John … On Fri, Jul 31, 2020 at 8:54 PM GadgetAngel @.***> wrote: Marlin version 2.0.6's definitions for PT100: - -5 : PT100 / PT1000 with MAX31865 (only for sensors 0-1) - 20 : Pt100 with circuit in the Ultimainboard V2.x with 5v excitation (AVR) - 21 : Pt100 with circuit in the Ultimainboard V2.x with 3.3v excitation (STM32 \ LPC176x....) - 201 : Pt100 with circuit in Overlord, similar to Ultimainboard V2.x - 147 : Pt100 with 4k7 pullup - 110 : Pt100 with 1k pullup (non standard) What is table 201 used for? What does "with circuit in Overlord" mean? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEY4LQZ5VZKI2GOBSYMWWBLR6LEJXANCNFSM4IJFILNQ .

I found out ---- table 201 you use it when I have a PT100 sensor attached to a PT100 amplifier board that uses LMV324 amp (used by the 3D printer Overlord V1.1)

GadgetAngel commented 4 years ago

Hi GadgetAngel, I had a quick look at the BTT SKR 1.4 schematic and it looks like EXP2 is the only choice for connecting any external SPI devices. If you are using a display you would need to make a custom cable that would break out the SPI signals from the EXP2 connector. The SPI bus on the EXP2 is one of two hardware SPI buses from the CPU and hopefully Marlin firmware can resolve which is which. Also, software bit-banging isn't needed since the SPI bus on EXP2 is a hardware SPI bus. Another option you might consider is to use a standard thermistor but if you need temperatures greater than about 270C they won't work for you. Yet another choice would be to use an analog PT100 amplifier (like the E3D board) and deal with making an analog thermistor lookup table. This was the option I chose, mainly because I already had the E3D board. Keep in mind that absolute accuracy of temperature measurement isn't all that important to 3D printing. What is important is consistent and stable measurement. BTT documentation is poor (understatement?) and things like PT100 support isn't on their radar. Regards, John … On Fri, Jul 31, 2020 at 2:25 PM GadgetAngel @.***> wrote: @johnny49r https://github.com/johnny49r Thanks for the input. What I am trying to figure out now is why would I use the hardware SPI over the Software SPI on a 3D printer? - I have searched with google about MAX31855 (thermocouple amplifier via SPI) and MAX31865 (PT100 amplifier via SPI) and a lot of users are using the hardware SPI option to connect up their amplifier boards. Why? I tell myself this: "The rise in temperature on a 3D printer is not faster than the 32-bit processor so SPI protocol implemented by software (bit-banging) is good enough". - With the hardware SPI option you MUST find the SPI MISO, SPI MOSI, and SPI CLK lines for the SPI bus (to tap into). Like you said you could use the EXP2 port. But, if you are using the EXP2 port for a display you will now have to create a custom cable for the EXP2 port so you can still get access to the SPI CLK line and SPI MOSI and SPI MISO lines. - But if you use Software SPI you can use any free digital I/O pins and assign them to be the SPI CLK, SPI MOSI, SPI MISO lines and the CS line. Software SPI will not run as fast as the hardware SPI but the change in temperature does not occur in less than a second. On a 32-bit processor slow is really not that slow anymore. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23 (comment)>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEY4LQ2PVPC3JSR5ZXRGYTTR6JWWPANCNFSM4IJFILNQ .

@johnny49r I tried your method last night. I followed your instructions and your thermistor_22.h table will not compile in the latest version of Marlin (Marlin-2.0.6).

The array "const short" is no longer supported its needs to be "const temp_entry_t" array and the two dimensional array will not work. The array has to be one dimensional. 

const short temptable_22[][2] PROGMEM = {
changes to 
const temp_entry_t temptable_22[] PROGMEM = {

Plus the

#define REVERSE_TEMP_SENSOR_RANGE flag needs to be changed to 
#define REVERSE_TEMP_SENSOR_RANGE_22 1

If you adjust your table or create another table thermistor_22.h for Marlin-2.0.6 with the above adjustments your instruction will work.

johnny49r commented 4 years ago

Hi,

I appreciate the heads up. I haven't installed 2.0.6 yet but I will do that soon.

Thanks, John

On Sat, Aug 1, 2020 at 8:02 PM GadgetAngel notifications@github.com wrote:

Hi GadgetAngel, I had a quick look at the BTT SKR 1.4 schematic and it looks like EXP2 is the only choice for connecting any external SPI devices. If you are using a display you would need to make a custom cable that would break out the SPI signals from the EXP2 connector. The SPI bus on the EXP2 is one of two hardware SPI buses from the CPU and hopefully Marlin firmware can resolve which is which. Also, software bit-banging isn't needed since the SPI bus on EXP2 is a hardware SPI bus. Another option you might consider is to use a standard thermistor but if you need temperatures greater than about 270C they won't work for you. Yet another choice would be to use an analog PT100 amplifier (like the E3D board) and deal with making an analog thermistor lookup table. This was the option I chose, mainly because I already had the E3D board. Keep in mind that absolute accuracy of temperature measurement isn't all that important to 3D printing. What is important is consistent and stable measurement. BTT documentation is poor (understatement?) and things like PT100 support isn't on their radar. Regards, John … <#m-7554804213983055194> On Fri, Jul 31, 2020 at 2:25 PM GadgetAngel @.***> wrote: @johnny49r https://github.com/johnny49r https://github.com/johnny49r Thanks for the input. What I am trying to figure out now is why would I use the hardware SPI over the Software SPI on a 3D printer? - I have searched with google about MAX31855 (thermocouple amplifier via SPI) and MAX31865 (PT100 amplifier via SPI) and a lot of users are using the hardware SPI option to connect up their amplifier boards. Why? I tell myself this: "The rise in temperature on a 3D printer is not faster than the 32-bit processor so SPI protocol implemented by software (bit-banging) is good enough". - With the hardware SPI option you MUST find the SPI MISO, SPI MOSI, and SPI CLK lines for the SPI bus (to tap into). Like you said you could use the EXP2 port. But, if you are using the EXP2 port for a display you will now have to create a custom cable for the EXP2 port so you can still get access to the SPI CLK line and SPI MOSI and SPI MISO lines. - But if you use Software SPI you can use any free digital I/O pins and assign them to be the SPI CLK, SPI MOSI, SPI MISO lines and the CS line. Software SPI will not run as fast as the hardware SPI but the change in temperature does not occur in less than a second. On a 32-bit processor slow is really not that slow anymore. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#23 (comment) https://github.com/bigtreetech/BIGTREETECH-SKR-PRO-V1.1/issues/23#issuecomment-666976371>, or unsubscribe https://github.com/notifications/unsubscribe-auth/AEY4LQ2PVPC3JSR5ZXRGYTTR6JWWPANCNFSM4IJFILNQ .

@johnny49r https://github.com/johnny49r I tried your method last night. I followed your instructions and your thermistor_22.h table will not compile in the latest version of Marlin (Marlin-2.0.6).

The array "const short" is no longer supported its needs to be "const temp_entry_t" array and the two dimensional array will not work. The array has to be one dimensional.

const short temptable_22[][2] PROGMEM = {

changes to

const temp_entry_t temptable_22[] PROGMEM = {

Plus the

define REVERSE_TEMP_SENSOR_RANGE flag needs to be changed to

define REVERSE_TEMP_SENSOR_RANGE_22 1

If you adjust your table or create another table thermistor_22.h for Marlin-2.0.6 with the above adjustments your instruction will work.

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codyrickman commented 4 years ago

Hello All,

I am using the MAX31855 which is very similar to the MAX31865 with the BigTreeTech V1.4 Turbo. This issue seems to be the only one I can find regarding how to wire an SPI thermopile amp to the Turbo, and im not sure if my configs are correct.

As soon as I set #define TEMP_SENSOR_0 -3 and define my pin P0_17, the board just hangs and does not show as a serial port or SD Card drive. I have no LCD on the printer yet so I don't know if it is stuck in a loop or what.

Current Config:

Configuration.h

define TEMP_SENSOR_0 -3

From @GadgetAngel s suggestions above

pins_BTT_SKR_V1_4_TURBO.h

ifndef MAX31865_CS_PIN

define TEMP_0_PIN P0_17

define MAX31865_CS_PIN TEMP_0_PIN

define MAX6675_SS_PIN MAX31865_CS_PIN

endif

This is my current wiring: MAX31855 -> SKR 1.4 Turbo Vin -> ZMIN +5v GRND -> ZMIN GRND DO -> P0_17 (EXP 2)(0.17) CS -> P0_16 (EXP 2)(SD_SS)(0.16) CLK -> P0_15 (EXP 2)(MISO)(SCK)(0.15)

johnny49r commented 4 years ago

When Marlin firmware detects overtemp it goes into shutdown and goes offline without any warning. I think you can disable this by commenting out the "#define THERMAL_PROTECTION_HOTENDS" in configure.h. This should allow you to troubleshoot your hot end temp sensor but don't forget to restore this after you have resolved the issue. John

On Sun, Aug 9, 2020 at 11:23 PM codyrickman notifications@github.com wrote:

Hello All,

I am using the MAX31855 which is very similar to the MAX31865 with the BigTreeTech V1.4 Turbo. This issue seems to be the only one I can find regarding how to wire an SPI thermopile amp to the Turbo, and im not sure if my configs are correct.

As soon as I set #define TEMP_SENSOR_0 -3 and define my pin P0_17, the board just hangs and does not show as a serial port or SD Card drive. I have no LCD on the printer yet so I don't know if it is stuck in a loop or what.

Current Config: Configuration.h

define TEMP_SENSOR_0 -3

pins_BTT_SKR_V1_4_TURBO.h

ifndef MAX31865_CS_PIN

define TEMP_0_PIN P0_17

define MAX31865_CS_PIN TEMP_0_PIN

define MAX6675_SS_PIN MAX31865_CS_PIN

endif

This is my current wiring: MAX31855 -> SKR 1.4 Turbo Vin -> ZMAX +5v GRND -> ZMAX GRND DO -> P0_17 (EXP 2)(0.17) CS -> P0_16 (EXP 2)(SD_SS)(0.16) CLK -> P0_15 (EXP 2)(MISO)(SCK)(0.15)

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codyrickman commented 4 years ago

Thank you @johnny49r

I commented out the line "#define THERMAL_PROTECTION_HOTENDS" But unfortunately the board still wont boot/connect to serial, even if I disconnect the MAX31855. The only way I can get it up and running again is setting the -3 back to 1 for the thermistor type.

Is there any documentation out there that shows how to use the MAX31855 to the SPI bus and configure it properly as a hotend thermistor?

code505 commented 4 years ago

@johnny49r Thanks for the input.

EDIT: Since SPI is not working with analog ADC inputs (it is completely digital) whether or not the I/O line has a resistor in series with the I/O line is not a concern. I write these things out to keep them straight in my own mind.

You could use it on the thermistor port. You would then use the thermistor port pin name as TEMP_0_PIN. Set TEMP_SENSOR_0 to -5 and set in configuration_adv.h enable TMC_USE_SW_SPI line. Then include the following in your pins_file for your processor (this way uses Software SPI):

 #ifndef MAX31865_CS_PIN
    #define MAX31865_CS_PIN TEMP_0_PIN
    #define MAX6675_SS_PIN MAX31865_CS_PIN
    #define MAX31865_MOSI_PIN TMC_SW_MOSI
    #define MAX31865_MISO_PIN TMC_SW_MISO
    #define MAX31865_SCK_PIN TMC_SW_SCK
#endif

If you want Hardware SPI you would have to use the true SPI CLK pin, SPI MOSI pin, SPI MISO pin (on EXP2 connector) and set the thermistor port pin name as TEMP_0_PIN. Set TEMP_SENSOR_0 to -5 and then include the following in your pins_file for your processor (this way uses Hardware SPI):

 #ifndef MAX31865_CS_PIN
  #define MAX31865_CS_PIN TEMP_0_PIN
  #define MAX6675_SS_PIN MAX31865_CS_PIN
#endif

What I am trying to figure out now is why would I use the hardware SPI over the Software SPI on a 3D printer?

  • I have searched with google about MAX31855 (thermocouple amplifier via SPI) and MAX31865 (PT100 amplifier via SPI) and a lot of users are using the hardware SPI option to connect up their amplifier boards. Why?

I tell myself this: "It takes more than 1 second for a 3D printer to change temperature on the extruder, therefore the 32-bit processor can keep up with the change in temperature without any issues (process the interrupts) so SPI protocol implemented by software (bit-banging) is good enough".

  • With the hardware SPI option you MUST find the SPI MISO, SPI MOSI, and SPI CLK lines for the SPI bus (to tap into). Like you said you could use the EXP2 port. But, if you are using the EXP2 port for a display you will now have to create a custom cable for the EXP2 port so you can still get access to the SPI CLK line and SPI MOSI and SPI MISO lines.
  • But if you use Software SPI you can use any free digital I/O pins and assign them to be the SPI CLK, SPI MOSI, SPI MISO lines and the CS line. Software SPI will not run as fast as the hardware SPI but the change in temperature does not occur in less than a second. On a 32-bit processor slow is really not that slow anymore.

@johnny49r, Yes, I see your point about the SKR V1.4 board. You would be hard pressed to find 4 free I/O lines on the SKR V1.4 board to use for Software SPI. So on the SKR V1.3/SKR V1.4/SKR V1.4 Turbo making a custom cable to the EXP2 port would be your only reasonable option. But for the SKR PRO V1.1 board you have EXTENSION-1 and EXTENSION-2 headers which give you more than enough free I/O pins so setting up Software SPI would be the easier option.

Hello, I'm complete newbie here :) I have SKR pro v1.1, pt100 and MAX31865 Board I would like to connect MAX31865 using hardware SPI, I'm using tmc5160, so I'm I'll be using EXP2 to connect MAX31865, I figured out how to connect the board to MISO, MOSI and CLK to EXP2, and what I understand from your post, is that I should connect CS of the board to thermistor pin in my board (pin PF4) AND copy this to pins_BTT_SKR_PRO_V1_1.h

  #ifndef MAX31865_CS_PIN
  #define MAX31865_CS_PIN TEMP_0_PIN
   #define MAX6675_SS_PIN MAX31865_CS_PIN
 #endif

and that's it, please correct me If I'm wrong?? Thanks in advance

GadgetAngel commented 4 years ago

Hello All,

I am using the MAX31855 which is very similar to the MAX31865 with the BigTreeTech V1.4 Turbo. This issue seems to be the only one I can find regarding how to wire an SPI thermopile amp to the Turbo, and im not sure if my configs are correct.

As soon as I set #define TEMP_SENSOR_0 -3 and define my pin P0_17, the board just hangs and does not show as a serial port or SD Card drive. I have no LCD on the printer yet so I don't know if it is stuck in a loop or what.

Current Config:

Configuration.h

define TEMP_SENSOR_0 -3

From @GadgetAngel s suggestions above

pins_BTT_SKR_V1_4_TURBO.h

ifndef MAX31865_CS_PIN

define TEMP_0_PIN P0_17

define MAX31865_CS_PIN TEMP_0_PIN

define MAX6675_SS_PIN MAX31865_CS_PIN

endif

This is my current wiring: MAX31855 -> SKR 1.4 Turbo Vin -> ZMIN +5v GRND -> ZMIN GRND DO -> P0_17 (EXP 2)(0.17) CS -> P0_16 (EXP 2)(SD_SS)(0.16) CLK -> P0_15 (EXP 2)(MISO)(SCK)(0.15)

@codyrickman Try this:

SKR V1 4 hookup to MAX31855 board for HARDWARE SPI_v2

@codyrickman IGNORE the above diagram, Please use this one instead, I hope it helps:

SKR V1 4 hookup to MAX31855 board for HARDWARE SPI_v3-UPDATED

GadgetAngel commented 4 years ago

@johnny49r Thanks for the input.

EDIT: Since SPI is not working with analog ADC inputs (it is completely digital) whether or not the I/O line has a resistor in series with the I/O line is not a concern. I write these things out to keep them straight in my own mind.

You could use it on the thermistor port. You would then use the thermistor port pin name as TEMP_0_PIN. Set TEMP_SENSOR_0 to -5 and set in configuration_adv.h enable TMC_USE_SW_SPI line. Then include the following in your pins_file for your processor (this way uses Software SPI):

 #ifndef MAX31865_CS_PIN
    #define MAX31865_CS_PIN TEMP_0_PIN
    #define MAX6675_SS_PIN MAX31865_CS_PIN
    #define MAX31865_MOSI_PIN TMC_SW_MOSI
    #define MAX31865_MISO_PIN TMC_SW_MISO
    #define MAX31865_SCK_PIN TMC_SW_SCK
#endif

If you want Hardware SPI you would have to use the true SPI CLK pin, SPI MOSI pin, SPI MISO pin (on EXP2 connector) and set the thermistor port pin name as TEMP_0_PIN. Set TEMP_SENSOR_0 to -5 and then include the following in your pins_file for your processor (this way uses Hardware SPI):

 #ifndef MAX31865_CS_PIN
  #define MAX31865_CS_PIN TEMP_0_PIN
  #define MAX6675_SS_PIN MAX31865_CS_PIN
#endif

What I am trying to figure out now is why would I use the hardware SPI over the Software SPI on a 3D printer?

  • I have searched with google about MAX31855 (thermocouple amplifier via SPI) and MAX31865 (PT100 amplifier via SPI) and a lot of users are using the hardware SPI option to connect up their amplifier boards. Why?

I tell myself this: "It takes more than 1 second for a 3D printer to change temperature on the extruder, therefore the 32-bit processor can keep up with the change in temperature without any issues (process the interrupts) so SPI protocol implemented by software (bit-banging) is good enough".

  • With the hardware SPI option you MUST find the SPI MISO, SPI MOSI, and SPI CLK lines for the SPI bus (to tap into). Like you said you could use the EXP2 port. But, if you are using the EXP2 port for a display you will now have to create a custom cable for the EXP2 port so you can still get access to the SPI CLK line and SPI MOSI and SPI MISO lines.
  • But if you use Software SPI you can use any free digital I/O pins and assign them to be the SPI CLK, SPI MOSI, SPI MISO lines and the CS line. Software SPI will not run as fast as the hardware SPI but the change in temperature does not occur in less than a second. On a 32-bit processor slow is really not that slow anymore.

@johnny49r, Yes, I see your point about the SKR V1.4 board. You would be hard pressed to find 4 free I/O lines on the SKR V1.4 board to use for Software SPI. So on the SKR V1.3/SKR V1.4/SKR V1.4 Turbo making a custom cable to the EXP2 port would be your only reasonable option. But for the SKR PRO V1.1 board you have EXTENSION-1 and EXTENSION-2 headers which give you more than enough free I/O pins so setting up Software SPI would be the easier option.

Hello, I'm complete newbie here :) I have SKR pro v1.1, pt100 and MAX31865 Board I would like to connect MAX31865 using hardware SPI, I'm using tmc5160, so I'm I'll be using EXP2 to connect MAX31865, I figured out how to connect the board to MISO, MOSI and CLK to EXP2, and what I understand from your post, is that I should connect CS of the board to thermistor pin in my board (pin PF4) AND copy this to pins_BTT_SKR_PRO_V1_1.h

 #ifndef MAX31865_CS_PIN
 #define MAX31865_CS_PIN TEMP_0_PIN
  #define MAX6675_SS_PIN MAX31865_CS_PIN
#endif

and that's it, please correct me If I'm wrong?? Thanks in advance

@code505 ,

Why make this harder on yourself? You do not have to splice into the ribbon cable of the EXP2 port on the SKR PRO V1.1 board. If you must use HARDWARE SPI instead of SOFTWARE SPI use the SPI header on the SKR PRO V1.1 board. Since you will be using Digital I/O to get your temperature sensor data you DO NOT want to use the thermistor port. You want to use a spare Digital I/O pin and it so happens that the Extension-1 or Extension-2 headers have a lot of free ones.

Here is a PT100 Guide for SKR PRO V1.1 via the SPI bus: https://drive.google.com/file/d/1zOky07F_R_DO_-XxZx6C3xULqhuxYMOi/view?usp=sharing

May be this guide will help you. You can download the PDF and let me know how it goes. I get you to review my document you get help with your problem. We both win.

FYI, the SPI header on the SKR PRO V1.1 has a X_CS pin, PLEASE, PLEASE DO NOT USE this as your CS pin. It belongs to the X Driver Socket. Most 3D Printers have an X-Axis in use and you do not want to override the X Axis. So, use another free Digital I/O Pin on the Extension-1 or Extension-2 headers. It's OK to use the X socket SPI lines for SCK, MOSI and MISO but again do not use the X_CS PIN on the SPI header of the SKR PRO V1.1 board!

code505 commented 4 years ago

Thank you so much bro for this detailed workup, you are the best MAN.

However now I'm facing a problems, once I changed TEMP_SENSOR_0 to -5, My BTT TFT3.5 is showing no printer attached.

I have tried every thing I could find with no luck, once I return TEMP_SENSOR_0 to 1, it work flawlessly, compiling is showing no error

regarding the MAX31865, I have decided to go the easier route with software SPI, as I'm using TMC5160, and I think I can't use the SPI expansion while using TMC driver in SPI mode