import RPi.GPIO as GPIO
import time

# photo sensor on PIN 5
PIN_SENSOR = 5

# LED on PIN 22
PIN_LED = 22

GPIO.setmode(GPIO.BCM)
GPIO.setup(PIN_SENSOR, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(PIN_LED, GPIO.OUT)
GPIO.output(PIN_LED, GPIO.LOW)



try:
    while True:
        print('Wait for photo sensor')
        GPIO.wait_for_edge(PIN_SENSOR, GPIO.RISING)
        
        print('Photo sensor active, activating light')
        
        # turn LED on
        GPIO.output(PIN_LED, GPIO.HIGH)
        time.sleep(1)
        GPIO.output(PIN_LED, GPIO.LOW)
        
        # wait until sensor is not blocked anymore (v1)
        while (GPIO.input(PIN_SENSOR) == GPIO.HIGH):
            print('blocked')
            time.sleep(1)
            

# Exit when Ctrl-C is pressed
except KeyboardInterrupt:
    print('Shutdown')
    
finally:
    print('Reset GPIO configuration and close')
    GPIO.cleanup()