Initial commit

raspberry-pi/gpio-shutdown.py

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+#!/usr/bin/python
+#
+# Watch board pin number 5 for level changes and initiate a power-off
+# when this pin goes low.
+#
+from RPi import GPIO
+from subprocess import call
+
+# https://pinout.xyz/pinout/i2c
+pin = 5  # a.k.a BCM 3 a.k.a SCL
+
+GPIO.setmode(GPIO.BOARD)
+GPIO.setup(pin, GPIO.IN)
+GPIO.wait_for_edge(pin, GPIO.FALLING)
+print('Board pin number 5 dropped to low, initiating poweroff')
+call(["/bin/systemctl","poweroff","--force"])

raspberry-pi/gpio-shutdown.service

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+[Unit]
+Description=Shutdown Pi when GPIO 5 is tied to ground
+After=network.target
+
+[Service]
+ExecStart=/home/pi/lamatrix/raspberry-pi/gpio-shutdown.py
+User=pi
+Group=pi
+
+[Install]
+WantedBy=basic.target

raspberry-pi/lamatrix.service

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+[Unit]
+Description=Run LaMatrix main loop
+After=network.target
+
+[Service]
+ExecStart=/usr/bin/env python /home/pi/lamatrix/main.py
+WorkingDirectory=/home/pi/lamatrix
+StandardOutput=null
+Restart=on-failure
+RestartSec=60s
+User=pi
+Group=pi
+
+[Install]
+WantedBy=basic.target