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Raspberry Pi Shutdown Button
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| #!/usr/bin/env python | |
| import RPi.GPIO as GPIO | |
| import subprocess | |
| import time | |
| GPIO.setmode(GPIO.BCM) | |
| GPIO.setup(3, GPIO.IN, pull_up_down=GPIO.PUD_UP) | |
| while True: | |
| GPIO.wait_for_edge(3, GPIO.FALLING, bouncetime=100) | |
| if GPIO.wait_for_edge(3, GPIO.RISING, timeout=2900) is None: | |
| subprocess.call(['wall.sh', "THE SYSTEM IS SHUTTING DOWN"], shell=False) | |
| time.sleep(3) | |
| subprocess.call(['shutdown', '-h', 'now'], shell=False) |
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| #!/bin/sh | |
| for f in /dev/pts/[0-9]* | |
| do | |
| echo "Broadcast message from $(whoami)@$(hostname) ($(date +'%a %b %d %H:%M:%S %Y')):" > $f | |
| echo $* > $f | |
| done |
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This modification is made on this article https://howchoo.com/g/mwnlytk3zmm/how-to-add-a-power-button-to-your-raspberry-pi , in order to require the button to be pressed for 3 seconds and broadcast the message to the virtual terminals on GUI before shutting down.