Raspberry Pi Light Sensor
Required Raspberry Pi Ethernet Cord or Wifi dongle Light sensor (LDR Sensor) 1uF Capacitor #!/usr/local/bin/python import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BOARD) #define the pin that goes to the circuit pin_to_circuit = 7 def rc_time (pin_to_circuit): count = 0 #Output on the pin for GPIO.setup(pin_to_circuit, GPIO.OUT) GPIO.output(pin_to_circuit, GPIO.LOW) time.sleep(0.1) #Change the pin back to input GPIO.setup(pin_to_circuit, GPIO.IN) #Count until the pin goes high while (GPIO.input(pin_to_circuit) == GPIO.LOW): count += 1 return count #Catch when script is interrupted, cleanup correctly try: # Main loop while True: print rc_time(pin_to_circuit) except KeyboardInterrupt: pass finally: GPIO.cleanup() http://pimylifeup.com/raspberry-pi-light-sensor/