pir2.py

import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO.BCM)
GPIO.setup(27, GPIO.OUT)
GPIO_PIR = 7
print "PIR Module Test (CTRL-C to exit)"  # Set pin as input
GPIO.setup(GPIO_PIR, GPIO.IN)
Current_State = 0
Previous_State = 0
try:
    print "Waiting for PIR to settle ..."
    # Loop until PIR output is 0
    while GPIO.input(GPIO_PIR) == 1:
        Current_State = 0
    print "  Ready"
             # Loop until users quits with CTRL-C
    while True:
        # Read PIR state
        Current_State = GPIO.input(GPIO_PIR)
        if Current_State == 1 and Previous_State == 0:
        # PIR is triggered
            print "  Motion detected!"
                   # Record previous state
            GPIO.output(27, GPIO.HIGH)
            GPIO.output(27, GPIO.LOW)
            Previous_State = 1
        elif Current_State == 0 and Previous_State == 1:
            # PIR has returned to ready state
            print "  Ready"
            Previous_State = 0
            # Wait for 10 milliseconds
            sleep(0.01)
    # clean up gpio pins when we exit the script 
except KeyboardInterrupt:
    print "  Quit"
    # Reset GPIO settings
    GPIO.cleanup()