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DAS Wireless Sensor Modules

Wireless sensor firmware based on MicroPython.

Getting Started

For an overview of the wireless module usage from a user's view, see the Notion manual.

Set up development environment

Make sure to use Visual Studio Code for the best development experience.

# Install the required tools
pipenv install
pipenv shell

# Configure VS-Code auto-completion for micropython
micropy stubs add esp32-micropython-1.12.0
micropy

You will need to create a local version of config.py (cp src/config.example.py src/config.py) and change some settings.

Name Description
MQTT_BROKER IP address of the MQTT broker
ESSID Name of WiFi network to connect to
PASSWORD WiFi password

Flashing MicroPython to the ESP32

The ESP32 needs to be flashed with the base micropython firmware. This only needs to be done once. See the MicroPython ESP32 Getting Started guide for detailed instructions. At this point, version v1.13 of micropython (esp32-idf3-20200902-v1.13.bin) is required to run the modules. You can download the firmware here.

Uploading Code

The upload.sh file in middle_module folder can be used to upload all relevant files on the ESP32.

# Change this to the serial port of the ESP32
./upload.sh --port /dev/ttyUSB0

Running code on the ESP32

If using picocom:

  1. Open terminal and connect the ESP32 to your computer
  2. Run picocom <insert_device_port_number> -b 115200. This would run boot.py and then main.py.
  3. Use mosquitto to interact with ESP32 (see this)
  4. If you find that the board is not publishing to the mqtt topic or is not running, try the next few steps.
  5. Use Control-C to open REPL
  6. To explicitly run a file, say main.py on the board use import main.py or import main, depending on your ESP32 version. Note: This only works once in a picocom session, after that you'll need to close picocom and repeat from step 5.

Use Control-A and then Control-X to terminate picocom.