This is the repository that processes real-time sensor data on the Raspberry Pi Pico onboard the CLAMP device.

Setup

Repo setup

This repo uses a git submodule for the RP2040 SD SPI library. When cloning the repo, make sure to clone with --recurse-submodules like:

$ git clone --recurse-submodules -j8 git@github.com:lmlack/thermostation.git

or if you have already cloned and forgot about the submodules, just run

$ git submodule update --init --recursive

Build

This project, like all rpi pico C sdk projects, uses cmake to build. To build with cmake, create a directory for all the cmake outputs (usually called build) and run cmake while passing it the directory containing the CMakeLists.txt. Then make can be run on the generate makefile to build the project:

$ mkdir build && cd build
$ cmake ../
$ make

Flash

To flash on the firmware, there are many options. There are plenty of rpi pico flashing tutorials out there, but the simplest options are to reboot the pico while holding the boot button to put it into bootloader mode, and then copy the uf2 file created in build/ by the build process to the USB mass storage device for the pico that appears in bootloader mode, or install and use picotool:

$ make && picotool load hp_test.uf2 -f

Run python data streamer

The repo includes a python program that deserializes and plots the data in real time, using multiple processes to help ensure no dropped samples.

This serves as a good example of how to read and deserialize the data stream.

To run the plotting program, you'll need to install the following python package prerequisites:

• pyserial
• numpy
• matplotlib

Once that's done, run the program like any other python program, passing one positional command line arg, the path to the serial port:

$ python3 log_data.py /dev/ttyACM0