Program to take the inputs of both passive infrared (PIR) and photocell sensors and combine that data to "detect things moving in the dark", & turn on a light.

PIRsensor.py

import RPi.GPIO as GPIO, time, os

DEBUG = 1
GPIO.setmode(GPIO.BCM)

# Setting up port to use on Blue LED
BLUE_LED = 25
GPIO.setup(BLUE_LED, GPIO.OUT)

# Define GPIO port to use for PIR
GPIO_PIR = 23

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 user 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!"
            # Light up LED
            GPIO.output(BLUE_LED, True)
            # Record previous state
            Previous_State=1
        elif Current_State==0 and Previous_State==1:
            # PIT has returned to ready state
            print "  Ready"
            # Turn LED off
            GPIO.output(BLUE_LED, False)
            Previous_State=0
        # Wait for 10 milliseconds
        time.sleep(0.01)

Except KeyboardInterrupt:
    print "  Quit"
    # Reset GPIO settings
    GPIO.cleanup()

try: 
    while True:
        lightlevel = RCtime(18)
        print lightlevel
        if lightlevel > 1000: 
            GPIO.output(BLUE_LED, True)
        else:
            GPIO.output(BLUE_LED, False)

except KeyboardInterrupt:
    GPIO.cleanup()
    print "Clean program exit."