Heizungssteuerung mit Nachlauf

#!/usr/bin/env python3
import subprocess
import time
import queue
import threading
import tkinter as tk
from subprocess import call
from rpi_lcd import LCD
from signal import signal, SIGTERM, SIGHUP
from pathlib import Path
from RPi import GPIO

q = queue.Queue()


def EingabeFenster():   
    def button_start70():
        q.put(70)
    def button_start75():
        q.put(75)
    def button_start80():
        q.put(80)
    def button_start85():
        q.put(85)
        
    def button_stop():
        q.put(0)
        
    def button_sd():
        q.put(2)
        
    fenster = tk.Tk()
    fenster.attributes("-topmost", True)

    
    fenster.title("Bedampfersteuerung.")

    start_button70 = tk.Button(fenster, text="Start 70", bg='#6A5Acd', command=button_start70)
    start_button75 = tk.Button(fenster, text="Start 75", bg='#A020F0', command=button_start75)
    start_button80 = tk.Button(fenster, text="Start 80", bg='#912CEE', command=button_start80)
    start_button85 = tk.Button(fenster, text="Start 85", bg='#7D26CD', command=button_start85)
    stop_button = tk.Button(fenster, text="\n Stop \n",bg='red', command=button_stop)
    sd_button = tk.Button(fenster,text="Herunterfahren", command=button_sd)

    anweisungs_label = tk.Label(fenster, text="untere Soll Temperatur wählen")

    info_label = tk.Label(fenster, text="System Herunterfahren")

   
    anweisungs_label.grid(row=0, column=0, columnspan = 4, padx='5', pady='5', sticky='ew')
    start_button70.grid(row=1, column=0, padx='5', pady='5', sticky='ew')
    start_button75.grid(row=1, column=1, padx='5', pady='5', sticky='ew')
    start_button80.grid(row=2, column=0, padx='5', pady='5', sticky='ew')
    start_button85.grid(row=2, column=1, padx='5', pady='5', sticky='ew')
    stop_button.grid(row=1, column=3, rowspan =2, padx='5', pady='5', sticky='ew')
    info_label.grid(row=3, column=0, columnspan =4, padx='5', pady='5', sticky='ew')
    sd_button.grid(row=4, column=0, columnspan =4, padx='5', pady='5', sticky='ew')
    fenster.mainloop()
threading.Thread(target=EingabeFenster, daemon=True).start()

def safe_exit():
    exit(1)


TEMPERATURE_SENSOR_PATH = (
    min(Path("/sys/bus/w1/devices").glob("28*")) / "w1_slave"
)
BUTTON_PIN = 20
HEATING_PIN = 21
lcd = LCD()

def read_temperature_raw():
    with TEMPERATURE_SENSOR_PATH.open("r", encoding="utf-8") as file:
        return list(file)


def read_temperature():
    
    while True:
        try:
            lines = read_temperature_raw()
            if lines[0].strip().endswith("YES"):
                break
        except IndexError:
            lcd.text("IO Fehler",1)
        time.sleep(0.2)
    return float(lines[1][lines[1].index("t=") + 2 :]) / 1000


def main():
    subprocess.run(["modprobe", "w1-gpio"], check=True)
    subprocess.run(["modprobe", "w1-therm"], check=True)
    try:
        GPIO.setmode(GPIO.BCM)
        GPIO.setup(HEATING_PIN, GPIO.OUT)
        GPIO.setup(BUTTON_PIN, GPIO.IN)
        signal(SIGTERM, safe_exit)
        signal(SIGHUP, safe_exit)
        seconds = 0
        soll = 80
        while True:
            if GPIO.input(BUTTON_PIN):
                seconds = 1200
            if not q.empty(): 
                s = q.get()
                if s >= 65:
                    seconds = 1200
                    soll = s
                if s == 0:
                    seconds = 0
                if s == 2:
                    seconds =-20
            temperature = round(read_temperature(),1)
            if seconds == 0:
                    lcd.text("zum Satarten",1)
                    lcd.text("Taste drücken",2)
            if temperature > soll:
                seconds -= 1
                if seconds < 0:
                    lcd.text(f'{temperature}C', 1)
                    lcd.text("fertig   ", 2)
                else:
                    lcd.text(f'{temperature}C   {round(seconds)} s',1)
                    lcd.text("aufgeheizt", 2)
            if seconds >=1:
                GPIO.output(HEATING_PIN,GPIO.HIGH)
                if temperature <= soll:
                    lcd.text(f'{temperature}C aufheizen', 1)
                    lcd.text(f'Sollwert  {soll}C', 2)
    
            else:
                GPIO.output(HEATING_PIN,GPIO.LOW)
            if seconds <=-20:
                lcd.text("Netzstecker",1)
                lcd.text("zeihen fertig",2)
                GPIO.cleanup()
                time.sleep(1)
                call("sudo nohup shutdown -h now", shell=True)
    finally:
        GPIO.cleanup()
        

if __name__ == "__main__":
    main()