Raspberry Pi "Knocker"

PI_Knock.py

import pifacedigitalio as pfio
import time,sys, threading

pifacedigital = pfio.PiFaceDigital()
pfio.init()

#Blink LED to let user know they can enter knock codes
def blink_LED(PIN):
	while 1:
		p = PIN
		pfio.digital_write(p, 1)
		time.sleep(.1)
		pfio.digital_write(p, 0)
		time.sleep(.1)

count = 0

#Blue LED
PIN = 4

#Blink Blue LED in a thread with its own timer
t = threading.Thread(target=blink_LED, args=(PIN,))
t.start()
print "DEVICE READY\n"
print "Please knock ONCE to enter a new code: "
one_knock = 0
while one_knock != 1:
	#Check for action on the Piezo Pad
	knock = pfio.digital_read(4,0)
	if knock == 1:
		one_knock = one_knock + 1
		print "KNOCK acknowledged!"
time.sleep(2)
print "Please enter your secret knock code: "

while True:
	######################################################################
      # !!! INTERPRET KNOCK DATA !!!
      ######################################################################
	try:
		#Check for action on the Piezo Pad
		knock = pfio.digital_read(4,0)
		
		#if a knock occurs....
		if knock == 1:
			
			print "KNOCK%d" % count 
			count = count + 1
			
			#GREEN LED ON
			pfio.digital_write(6, 1)
			#RED LED OFF
			pfio.digital_write(7, 0)
			#Solenoid LOW
			pfio.digital_write(5, 0)
			time.sleep(.25)	
		else:
			#RED LED ON
			pfio.digital_write(7, 1)
			#GREEN LED OFF
			pfio.digital_write(6, 0)
			#Solenoid HIGH
			pfio.digital_write(5, 1)
			
	except KeyboardInterrupt:
		#General Cleanup
		pfio.deinit() 
		sys.exit()