Arduino weather

Weather application that can show multiple locations with the current temperature for Arduino devices with connected LCD display.

The tool consists of a part that runs on the Arduino and another part that can run on any system that supports Python 3.7+

Required libraries:

• LiquidCrystal
• ArduinoJson
• arduino-timer

Setup

Setup the wiring like below. More images and be found in the images folder.

The weather.cpp needs to be loaded onto the Arduino, before the Python script can communicate with with it. You may need to adjust it to your configuration.

Usage

Arduino

Using arduino-cli

arduino-cli lib install LiquidCrystal ArduinoJson arduino-timer
arduino-cli compile -b arduino:avr:uno .
arduino-cli upload -p $SERIAL_DEVICE --fqbn arduino:avr:uno .

Serial host

poetry run python -m arduino_weather

Environment variables:

• OWM_API_KEY required, OpenWeatherMap API key
• LOCATIONS required, weather from locations to be shown, needs to be specified in the following format: London,GB;Zurich,CH;Munich,DE
• TIMEZONE optional, defaults to Europe/Zurich
• SERIAL_DEVICE optional, The port of your Arduino serial device, defaults to /dev/cu.usbmodem14301
• DRY_MODE optional, just show weather data without LCD connected, defaults to False

Systemd entry

To start this as a service, you can use this example systemd config:

[Unit]
Description=Arduino Weather service
After=network.target

[Service]
User=arduino-weather
ExecStart=/usr/local/bin/poetry run python -m arduino_weather
WorkingDirectory=/opt/arduino-weather
Environment="SERIAL_DEVICE=/dev/ttyACM0"
Environment="OWM_API_KEY=<example-key>"
Environment="LOCATIONS=London,GB;Zurich,CH;Munich,DE"
Restart=always
RestartSec=3

[Install]
WantedBy=default.target