Hi, I purchased a 4 x 4 keyboard like in the picture. I want to use it in a codesys project. I'm using this cheat: import RPi.GPIO as GPIO import time L1 = 16 L2 = 20 L3 = 21 L4 = 26 C1 = 5 C2 = 6 C3 = 13 C4 = 19 GPIO.setwarnings (False) GPIO.setmode (GPIO.BCM) GPIO.setup (L1, GPIO.OUT) GPIO.setup (L2, GPIO.OUT) GPIO.setup (L3, GPIO.OUT) GPIO.setup (L4, GPIO.OUT) GPIO.setup (C1, GPIO.IN, pull_up_down = GPIO.PUD_DOWN) GPIO.setup (C2, GPIO.IN, pull_up_down = GPIO.PUD_DOWN) GPIO.setup (C3, GPIO.IN,...