Fairytale Phone

phone.py

#!/usr/bin/python
import RPi.GPIO as GPIO


IO_PIN_DIAL = 18
IO_PIN_NUMBER = 23

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.setup(IO_PIN_DIAL, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(IO_PIN_NUMBER, GPIO.IN, pull_up_down=GPIO.PUD_UP)

counter=0
last = 1

def count(pin):
        global counter
        counter += 1

GPIO.add_event_detect(IO_PIN_DIAL, GPIO.BOTH)

while True:
        try:
                if GPIO.event_detected(IO_PIN_DIAL):

                        current = GPIO.input(IO_PIN_DIAL)

                        if(last != current):
                                if(current == 0):
                                        GPIO.add_event_detect(IO_PIN_NUMBER, GPIO.BOTH, callback=count, bouncetime=5)
                                else:
                                        GPIO.remove_event_detect(IO_PIN_NUMBER)
                                        number = (counter/2 + 1) % 10
                                        print number
                                        counter=0
                                last = GPIO.input(IO_PIN_DIAL)
        except KeyboardInterrupt:
                break