Raspberry Pi & Arduino Projects

Projects for the Raspberry Pi or Arduino's I have sitting around.

Projects

Temperature Logger

temperature_logger.py

Dashboard

Logs the current temperature in the room and sends it to the Adafruit IO service.

Uses a Enviro-phat by Pimoroni sat on a Raspberry Pi Zero.

Useful Repositories & Links

• Raspberry Pi Webcam by Jeff Geerling
  • https://github.com/geerlingguy/pi-webcam

Helpful Things

Installing a Script as a Service

For something to run, and keep running when it inevitably crashes, we can use the built in Linux process systemd to manage it.

To get this working:

• Make sure it has the Python shebang at the top of the file #!usr/bin/python3
  • This may be different for you, try which python or which python3 to get the location on your system
• Make the script executable chmod a+x your_script_filename.py
• Create the service file:
  • cd /etc/systemd/system
  • sudo touch your_service_name.service
  • sudo nano your_service_name.service
  • Then that file needs to contain something like this:

[Unit]
Description=My service description here

[Service]
User=pi
WorkingDirectory=/home/pi
ExecStart=/path/to/your/script.py
Restart=always

[Install]
WantedBy=multi-user.target

• Then CTRL + X to exit, hitting Y to save
• You can start the service using sudo systemctl start your_service_name.service
• Then check on the service using sudo systemctl status your_service_name.service
• To get it "installed" so it runs on boot sudo systemctl enable your_service_name.service
  • To "uninstall" sudo systemctl disable your_service_name.service

That should be it and it runs on boot. Using the journalctl should allow to check on it and the log output

journalctl -u your_service_name -e