tripwire.py

import RPi.GPIO as GPIO
import subprocess
import datetime
import os
import time
import signal
import threading

# set PIN 2 (mode BCM) sebagai input
GPIO.setmode(GPIO.BCM)
CHANNEL = 2
GPIO.setup(CHANNEL, GPIO.IN)

is_playing = False

# Mengeksekusi perintah dalam interval waktu tertentu. Jika interval sudah dilewati, eksekusi perintah tsb dimatikan
def timeout_cmd(command, timeout):
    global is_playing
    cmd = command.split(" ")
    start = datetime.datetime.now()
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

    is_playing = True

    while proc.poll() is None:
        time.sleep(0.1)
        now = datetime.datetime.now()

        if (now-start).seconds > timeout:
            os.kill(prod.pid, signal.SIGKILL)
            os.waitpid(-1, os.WNOHANG)
            is_playing = False
        return None

while 1:
    if GPIO.input(CHANNEL):
        if not is_playing:
            timeout_cmd("omxplayer /home/pi/video/blablabla.mp4", 15)