I'm making a python script for a 4x4 keypad that's connected to a raspberry pi where the user enters a 4 pin code and the program tells the user whether or not it's correct. In order to take in the input from the keypad I'm using this python library called pad4pi(python 3 version) and it's almost done except for one part, I want to implement a timeout function so that if the user doesn't press any buttons on the keypad within a certain time frame(ie 5 seconds), the program resets the code variable which stores all the numbers the user enters from the keypad and starts over with the pin code entering process.
Here is the code:
from pad4pi import rpi_gpio import time # Setup Keypad KEYPAD = [ ["1","2","3","A"], ["4","5","6","B"], ["7","8","9","C"], ["*","0","#","D"] ] # same as calling: factory.create_4_by_4_keypad, still we put here fyi: ROW_PINS = [11, 9, 0, 5] # BCM numbering COL_PINS = [6, 13, 19, 26] # BCM numbering factory = rpi_gpio.KeypadFactory() keypad = factory.create_keypad(keypad=KEYPAD, row_pins=ROW_PINS, col_pins=COL_PINS) code=""#the numbers that user enters will be appended to this variable pin="0126"#this is the correct pin code, the code variable is compared to this variable def doKey(key): global code global pin code += key if (len(code) == len(pin)): if(code == pin): print('correct code') code="" else: print("Invalid code") code="" # doKey will be called each time a keypad button is pressed keypad.registerKeyPressHandler(doKey) try: while(True): time.sleep(0.2) except: keypad.cleanup() 
