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mstrens / oXs_on_RP2040

version of openXsensor to be used on raspberry pi pico RP2040 (more protocols, more functionalities)
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Not an issue, just a request for more info #86

Closed Billy60 closed 10 months ago

Billy60 commented 1 year ago

Hi Michel I have made a few Arduino based penXvarios with some success. However, This version seems more simple to tune but could you please show a 'miki' kind of page ?

mstrens commented 1 year ago

The list of fields depends on the protocol being activated. It is explained in a file doc/fields_per_protocol.txt

For temperature you need a chip that produce a voltage based on the temperature like the TMP36. The relation between temperature and voltage has to be linear. So a NTC is not good. You can connect 1 or 2 chips (on Volt3 and Volt4 pins). You have to declare (via a USB command) the number or temperature to be measured. You also have to adjust scale and offset (for volt 3 /volt 4) according the chip you use).

For RPM, oXs has to get pulses. The voltage of the pulse has to vary from 0V (min) to 3.3V (max). If you have a module that already provide such pulses it is ok to use it. If not it is safe to make some filter with a capacitor, one resistor and 2 diodes (to avoid having to low or to high voltage on the pin)

Billy60 commented 1 year ago

Thank you Michel, The RPM pulses will enter on which type of pin ? would it be the PWM one ? Have a good day

mstrens commented 1 year ago

RPM is not PWM related. You can choose the pin you want for RPM. You do it entering a command via USB/serial just like you must do to select the protocol (or other pin functions). Defining a pin for RPM ( with another value than 255) means that oXs will define it as input, will count the pulses and will transmit a telemetry field with RPM.

Billy60 commented 1 year ago

Great, you are the best ! Thanks a lot for all your help and for those fantastic projects.

Billy60 commented 1 year ago

Good morning Michel I have uploaded your oxs.uf2 file and do get the green led flashing nicely. Hover whenever I try to get into it with Thonny, I get the following message: WARNING:root:Unexpected echo. Expected b'%Run -c $EDITOR_CONTENT\r\n', got b'processing cmd\r\n\r\nCmd to ' What is this error ?

Thanks a lot !

mstrens commented 1 year ago

It is not foreseen to use it with Thonny. It uses only vscode, C++ and the RP2040 SDK provided by Rapsberry. please read the Readme file. It contains a link to a site that explains how to install the tools on windows. For linux and mac there are some doc on the web too (on the rapsberry site I think)

Billy60 commented 1 year ago

Thanks Michel, however I still only want to use the device as it is and would never modify it. Only, I don't get into the normal configuration of the pin numbers etc. I only get this error message. Do I have to go through all this hardly understandable sdk install and all those steps which are far beyond my abilities ? I would be very happy to have it run the simple way !

mstrens commented 1 year ago

To upload the program into the RP2040, you just have to

The program will be automatically uploaded and flashed.

Then you have to adapt the setup to you need. Without pressing the boot button, connect the RP2040 to the PC via USB. Start on your pc a serial terminal program. It can be e.g. the one from arduino IDE or another one like candle. Set the com port to 115200 baud and send commands to the serial port. Press e.g. ? + enter (question mark and ENTER) The Pc should display the full list of command that are available. E.g. to change the protocol enter : protocol=E You can define the pins being (for baro, GPS, ...) used in the way.

Billy60 commented 1 year ago

Thank you a lot Michel I had done all those steps properly but was having a hard time with Terminal softwares. The only one which worked was Termite, all the Powershell, Arduino one, TerraTerm, Thonny did not work. And I still don't know why ... But now it is flying, thank you for your developments and help !!

very best regards

Guillaume

Le mar. 27 juin 2023 à 11:18, mstrens @.***> a écrit :

To upload the program into the RP2040, you just have to

  • press the boot button while you connect the rp2040 to the PC via USB (this will enter it bootloader mode)
  • a usb drive appear on your pc
  • do a drag and drop of oXs.uf2 file to this drive.

The program will be automatically uploaded and flashed.

Then you have to adapt the setup to you need. Without pressing the boot button, connect the RP2040 to the PC via USB. Start on your pc a serial terminal program. It can be e.g. the one from arduino IDE or another one like candle. Set the com port to 115200 baud and send commands to the serial port. Press e.g. ? + enter (question mark and ENTER) The Pc should display the full list of command that are available. E.g. to change the protocol enter : protocol=E You can define the pins being (for baro, GPS, ...) used in the way.

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