from machine import ADC, Pin   
import time                    
import math

sensor = ADC(Pin(26))

led_rot   = Pin(15, Pin.OUT)
led_gruen = Pin(14, Pin.OUT)

MIN_TEMP = 20 
MAX_TEMP = 30  
              
def temperatur_lesen():
    rohwert = sensor.read_u16()

    spannung = rohwert / 65535

    widerstand = 10000 * spannung / (1 - spannung)

    temp_kelvin = 1 / (math.log(widerstand / 10000) / 3950 + 1 / 298.15)

    temp_celsius = temp_kelvin - 273.15

    return temp_celsius

#------------Hauptprogramm--------------
print("Programm gestartet!")

while True:  

    temp = temperatur_lesen()

    print("Aktuelle Temperatur:", round(temp, 1), "°C")

    if temp < MIN_TEMP or temp > MAX_TEMP:
        led_rot.on()      
        led_gruen.off()    
        print("→ Rote LED leuchtet (zu kalt oder zu warm)")

    else:
        led_rot.off()      
        led_gruen.on()     
        print("→ Grüne LED leuchtet (Temperatur OK)")

    time.sleep(1)