GPIO-Projekt 11 – Sicherheitssystem mit Tastatur

import RPi.GPIO as GPIO
from time import sleep

# Pin-definities
RED_PIN = 17
GREEN_PIN = 27
BLUE_PIN = 22
BUZZER_PIN = 18

ROWS = [5, 6, 13, 19]  # GPIO-pinnen voor rijen
COLS = [12, 16, 20, 21]  # GPIO-pinnen voor kolommen

# Keypad lay-out
KEYS = [
    ['1', '2', '3', 'A'],
    ['4', '5', '6', 'B'],
    ['7', '8', '9', 'C'],
    ['*', '0', '#', 'D']
]

PINCODE = "1234"  # Stel de gewenste pincode in

# GPIO setup
GPIO.setmode(GPIO.BCM)
GPIO.setup([RED_PIN, GREEN_PIN, BLUE_PIN, BUZZER_PIN], GPIO.OUT)

for row_pin in ROWS:
    GPIO.setup(row_pin, GPIO.OUT)
    GPIO.output(row_pin, GPIO.LOW)

for col_pin in COLS:
    GPIO.setup(col_pin, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)

def set_color(r, g, b):
    """Stelt de kleur van de RGB LED in."""
    GPIO.output(RED_PIN, r)
    GPIO.output(GREEN_PIN, g)
    GPIO.output(BLUE_PIN, b)

def read_key():
    """Leest een toets van het 4x4 Keypad."""
    for row_num, row_pin in enumerate(ROWS):
        GPIO.output(row_pin, GPIO.HIGH)
        for col_num, col_pin in enumerate(COLS):
            if GPIO.input(col_pin) == GPIO.HIGH:
                GPIO.output(row_pin, GPIO.LOW)
                return KEYS[row_num][col_num]
        GPIO.output(row_pin, GPIO.LOW)
    return None

try:
    while True:
        print("Voer de pincode in:")
        input_code = ""  # Variabele wordt hier correct gedefinieerd als lege string

        # Lees de pincode van het keypad
        while len(input_code) < len(PINCODE):
            key = read_key()
            if key:
                print(f"Toets ingedrukt: {key}")
                if key in ['*', '#', 'A', 'B', 'C', 'D']:
                    print("Speciale toets genegeerd.")
                    continue
                input_code += key  # Voeg de toets toe aan de pincode
                sleep(0.3)  # Voor debounce

        # Controleer de ingevoerde code
        if input_code == PINCODE:
            print("Correcte pincode!")
            set_color(0, 1, 0)  # Groen
        else:
            print("Foute pincode!")
            set_color(1, 0, 0)  # Rood
            GPIO.output(BUZZER_PIN, GPIO.HIGH)
            sleep(0.5)
            GPIO.output(BUZZER_PIN, GPIO.LOW)
        
        sleep(2)
        set_color(0, 0, 0)  # LED uit
except KeyboardInterrupt:
    print("Programma gestopt.")
finally:
    GPIO.cleanup()