Turn a Raspberry PI HDMI screen on/off using a PIR
This service can be used for any Raspberry PI project which has an HDMI monitor and a PIR; the monitor is switched on when movement is detected and turned off afer a configurable timeout.
| File | Purpose |
|---|---|
| INSTALL | A script which installs pirhdmi as a service |
| pirhdmi | The service which is run |
| pirhdmi.service | The systemd configuration |
| traceit.sh | Run the script tracing the execution, useful for debugging |
The timer is set to two minutes, to change that edit pirhdi and change the global variable ON_TIME to the number of seconds for the screen to stay on once activated.
The script is written in python3 and a full install of Raspbian is needed to run it.
Add this to /etc/xdg/lxsession/LXDE-pi/autostart
unclutter -idle 0.5 -root &
xhost + local:
/usr/bin/chromium-browser --noerrdialogs --disable-infobars --kiosk --app=<DAKBoard GUID>
Use raspi-config to enable the overlay file system to protect the SD card.
Screen blanking must be on in raspi-config
Connect the PIR power to pin 2, ground to pin 6 and signal to pin 7