# Link to circuit Diagram
# https://www.cl.cam.ac.uk/projects/raspberrypi/tutorials/robot/buttons_and_switches/
import RPi.GPIO as GPIO
import time

GPIO.cleanup()

GPIO.setmode(GPIO.BCM)

GPIO.setup(25, GPIO.IN)

buttonDown = False

while True:
	time.sleep(.1)
	input =	GPIO.input(25)
	if input:
		if not buttonDown:
			buttonDown = True
			print("button pushed")
			startTime = time.time()
	else:
		if buttonDown:
			elapsedTime = time.time() - startTime
			print(elapsedTime)
		buttonDown = False

GPIO.cleanup()