Passive Infrared Sensor code for a Raspberry Pi

pir.py

import RPi.GPIO as GPIO
import time
import os

GPIO.setmode(GPIO.BCM)
PIR_PIN = 25
GPIO.setup(PIR_PIN, GPIO.IN)

def MOTION(PIR_PIN):
               print 'Motion Detected! ' + time.ctime()

print 'PIR Module Test (CTRL+C to exit)'
time.sleep(2)
print 'Ready'

try:
               GPIO.add_event_detect(PIR_PIN, GPIO.RISING, callback=MOTION)
               while 1:
                              time.sleep(100)
except KeyboardInterrupt:
               print ' Quit'
               GPIO.cleanup()