Codes

# Input Check:

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(21,GPIO.OUT)
GPIO.setup(19, GPIO.IN, pull_up_down=GPIO.PUD_UP)

while True:
    input_state = GPIO.input(19)
    if input_state == True:
        GPIO.output(21,GPIO.HIGH)
    else:
        GPIO.output(21,GPIO.LOW)
        time.sleep(0.2)

# LCD Display:

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

# Zuordnung der GPIO Pins (ggf. anpassen)
LCD_RS = 4
LCD_E  = 17
LCD_DATA4 = 18
LCD_DATA5 = 22
LCD_DATA6 = 23
LCD_DATA7 = 24

LCD_WIDTH = 16      # Zeichen je Zeile
LCD_LINE_1 = 0x80   # Adresse der ersten Display Zeile
LCD_LINE_2 = 0xC0   # Adresse der zweiten Display Zeile
LCD_CHR = GPIO.HIGH
LCD_CMD = GPIO.LOW
E_PULSE = 0.0005
E_DELAY = 0.0005

def lcd_send_byte(bits, mode):
    # Pins auf LOW setzen
    GPIO.output(LCD_RS, mode)
    GPIO.output(LCD_DATA4, GPIO.LOW)
    GPIO.output(LCD_DATA5, GPIO.LOW)
    GPIO.output(LCD_DATA6, GPIO.LOW)
    GPIO.output(LCD_DATA7, GPIO.LOW)
    if bits & 0x10 == 0x10:
      GPIO.output(LCD_DATA4, GPIO.HIGH)
    if bits & 0x20 == 0x20:
      GPIO.output(LCD_DATA5, GPIO.HIGH)
    if bits & 0x40 == 0x40:
      GPIO.output(LCD_DATA6, GPIO.HIGH)
    if bits & 0x80 == 0x80:
      GPIO.output(LCD_DATA7, GPIO.HIGH)
    time.sleep(E_DELAY)
    GPIO.output(LCD_E, GPIO.HIGH)
    time.sleep(E_PULSE)
    GPIO.output(LCD_E, GPIO.LOW)
    time.sleep(E_DELAY)
    GPIO.output(LCD_DATA4, GPIO.LOW)
    GPIO.output(LCD_DATA5, GPIO.LOW)
    GPIO.output(LCD_DATA6, GPIO.LOW)
    GPIO.output(LCD_DATA7, GPIO.LOW)
    if bits&0x01==0x01:
      GPIO.output(LCD_DATA4, GPIO.HIGH)
    if bits&0x02==0x02:
      GPIO.output(LCD_DATA5, GPIO.HIGH)
    if bits&0x04==0x04:
      GPIO.output(LCD_DATA6, GPIO.HIGH)
    if bits&0x08==0x08:
      GPIO.output(LCD_DATA7, GPIO.HIGH)
    time.sleep(E_DELAY)
    GPIO.output(LCD_E, GPIO.HIGH)
    time.sleep(E_PULSE)
    GPIO.output(LCD_E, GPIO.LOW)
    time.sleep(E_DELAY)

def display_init():
    lcd_send_byte(0x33, LCD_CMD)
    lcd_send_byte(0x32, LCD_CMD)
    lcd_send_byte(0x28, LCD_CMD)
    lcd_send_byte(0x0C, LCD_CMD)
    lcd_send_byte(0x06, LCD_CMD)
    lcd_send_byte(0x01, LCD_CMD)

def lcd_message(message):
    message = message.ljust(LCD_WIDTH," ")
    for i in range(LCD_WIDTH):
      lcd_send_byte(ord(message[i]),LCD_CHR)

if __name__ == '__main__':
    # initialisieren
    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)
    GPIO.setup(LCD_E, GPIO.OUT)
    GPIO.setup(LCD_RS, GPIO.OUT)
    GPIO.setup(LCD_DATA4, GPIO.OUT)
    GPIO.setup(LCD_DATA5, GPIO.OUT)
    GPIO.setup(LCD_DATA6, GPIO.OUT)
    GPIO.setup(LCD_DATA7, GPIO.OUT)

    display_init()


    lcd_send_byte(LCD_LINE_1, LCD_CMD)
    lcd_message("Die Alarmanlage")
    lcd_send_byte(LCD_LINE_2, LCD_CMD)
    lcd_message("wurde ausgeloest")

    time.sleep(4)

    GPIO.cleanup()