Detect 4-pin push switch presses with Raspberry Pi's GPIO pins

push_switch.py

# Code stolen shamelessly from
# https://www.raspberrypi.org/forums/viewtopic.php?p=876947&sid=44c21629719b08f74de2b3b465db8d5c#p876947
# I merely modified some bits

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
pin = 4

GPIO.setup(pin, GPIO.IN, pull_up_down=GPIO.PUD_UP)
presses = 1

def my_callback(channel):
    global presses
    print("callback called " + str(presses) + " times")
    presses += 1

GPIO.add_event_detect(pin, GPIO.FALLING, callback=my_callback, bouncetime=500)

print("Waiting")
while True:
    try:
        time.sleep(5)
    except KeyboardInterrupt:
        GPIO.cleanup()
        break