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bigtreetech / EBB

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PT1000/TH0 mislabeling/clarification? #61

Open shoikan opened 1 year ago

shoikan commented 1 year ago

On the circuitboard of the EBB36 v1.2 a 2-pin header left of the center, bottom row of connectors is labeled 'PT1000'. On the wiring/pinout diagram that header is labeled TH0. There's also a header to the far right, bottom row of connectors without any markings on the pcb, right below the bank of microswitches, that's labeled PT100/PT1000 on the diagram.

Can you provide clarification which is to be used for which situation, and the correct pinout for the 4-pin connector? I think the PT1000 labeled 2-pin is for the emulated PT1000 sensor (like on the M5P board), and the unmarked 4-pin for the header that is connected to the MAX31865 chip, but it is not clear at all from the documentation.

Additionally, the pins to be used for a 2-pin sensor via the 4-pin connector are not specified. From other sources on the web I think those need to be connected to the center 2 pins, but it would be nice to get clarification here.

fryc88 commented 1 year ago

Yep, i just got to that stage today and i've noticed there's no pins described in PT1000 connector...Pretty common with BTT and other china manufacturers manuals/pinouts, so looks like we need to guess

shoikan commented 1 year ago

I have it figured out, it's just not very clear. The two pin header marked PT1000 is only necessary if you use the two pin thermistor header TH0 and have a PT1000 sensor connected to it. In that case there's a resistor needed, which you enable by bridging these pins with a jumper. The board then uses a software emulation to estimate the temperatures. It's apparently very inaccurate at low temperatures (according to other sources, and some hints in the manual too). This is explained on page 9 of the EBB36 english manual.

On page 10 of the manual there's a very summary drawing of the wiring of 2 wire and 4 wire PT1000 sensors, when you've got an EBB that has got an MAX31865. Basically: if you have a 2 wire version, wire the mid two pins. Because the drawing had no text next to it whatsoever I missed it on looking for it in the manual before.

@bigtreetech the info is apparently in the doc (as I found it), but it could definitely do with some clarification.

fryc88 commented 1 year ago

I've already found it too, that i need to use two middle pins, but on diagram available right in their github you can see every connector described with pinout except of pt1000...

Fuergrissa1 commented 9 months ago

So which pin do you use with for 2 wire sensors on the 4-pin connector. eg PA1, etc.. this doesn't seem to be labeled anywhere but must be set in klipper config.

appleimperio commented 9 months ago

@Fuergrissa1 are you using a Max amplifier?

Drew3164 commented 7 months ago

Does anyone know what I'm doing wrong I can get my 2 wire PT1000 to work with with the Max31865 EBB2209

[extruder] step_pin: EBBCan: PD0 dir_pin: !EBBCan: PD1 enable_pin: !EBBCan: PD2 microsteps: 16 rotation_distance: 33.500 nozzle_diameter: 0.400 filament_diameter: 1.750 heater_pin: EBBCan: PB13

sensor_type: EPCOS 100K B57560G104F

sensor_pin: EBBCan: PA3

sensor_type: MAX31865 sensor_pin: EBBCan: PA4 spi_bus: spi1 rtd_nominal_r: 1000 rtd_reference_r: 4300 rtd_num_of_wires: 2 control: pid pid_Kp: 21.527 pid_Ki: 1.063 pid_Kd: 108.982 min_temp: 0 max_temp: 250