Simple script to toggle display based off of PIR hooked up to sbc

wakeup

#!/bin/bash
# /etc/init.d/wakeup

### BEGIN INIT INFO
# Provides:          Wakeup for Display
# Required-Start:
# Required-Stop:
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start Wakeup at boot
# Description:       Start Wakeup at boot
### END INIT INFO

# If you want a command to always run, put it here
PATH=$PATH:/usr/local/bin

# Change this if necessary
MYPATH=/home/chip/MagicMirror

# Carry out specific functions when asked to by the system
case "$1" in
  start)
    echo "Starting Wakeup"
    # run application you want to start
    kill -9 $(ps aux | grep 'MagicMirror/wakeup.py' | awk '{print $2}')
    pushd $MYPATH/
    python $MYPATH/wakeup.py &
    popd
    ;;
  restart)
    echo "Restarting Wakeup"
    # run application you want to start
    kill -9 $(ps aux | grep 'MagicMirror/wakeup.py' | awk '{print $2}')
    pushd $MYPATH/
    python $MYPATH/wakeup.py &
    popd
    ;;
  stop)
    echo "Stopping Wakeup"
    # kill application you want to stop
    kill -9 $(ps aux | grep 'MagicMirror/wakeup.py' | awk '{print $2}')
    ;;
  *)
    echo "Usage: /etc/init.d/wakeup {start|stop|restart}"
    exit 1
    ;;
esac

exit 0

wakeup.py

#!/usr/bin/env python
import CHIP_IO.GPIO as GPIO
import subprocess
from subprocess import Popen, PIPE, STDOUT
import time


def display_power(enabled):
  command = ""

  if (enabled):
    print("Turning on display")
    command = "su -c 'DISPLAY=:0 xset dpms force on' chip"
  else:
    print("Turning off display")
    command = "su -c 'DISPLAY=:0 xset dpms force off' chip"

  subprocess.call(command, shell=True)


def check():
  enabled = GPIO.input("XIO-P1")

  check_display = """su -c "DISPLAY=:0 xset q | grep 'Monitor is'" chip"""
  p = Popen(check_display, shell=True, stdin=PIPE, stdout=PIPE, stderr=STDOUT, close_fds=True)

  if enabled and "Monitor is Off" in p.stdout.read():
    display_power(True)
  elif not enabled and "Monitor is On" in p.stdout.read():
    display_power(False)

try:
  GPIO.setup("XIO-P1", GPIO.IN)

  time.sleep(3)
  print("initial status: " + str(GPIO.input("XIO-P1")))

  while True:
    check()
    time.sleep(1)

except Exception as e:
  GPIO.cleanup()    # clean up GPIO on CTRL+C exit, or hopefully SIGEXIT
  print e
  print "Cleaning up forecfully"

print "Cleaning up normally"
GPIO.cleanup()      # clean up GPIO on normal exit

wakeup is the init.d (upstart) script and wakeup.py is the actual python script