import sys

import RPIO

def main():
	# Use the BCM addressing scheme
	RPIO.setmode(RPIO.BCM)

	# Setup all five outputs
	RPIO.setup(22, RPIO.IN)

	RPIO.add_interrupt_callback(22, switch_callback, edge='both', 
								pull_up_down=RPIO.PUD_DOWN, threaded_callback=False, 
								debounce_timeout_ms=300)

	print 'Okay, waiting for interrupts...'
	while True:
		RPIO.wait_for_interrupts()

def switch_callback(gpio_id, val):
	print 'Switch activated!  %s --- %s' % (gpio_id, val)


if __name__ == '__main__':
	sys.exit(main())