joghurt.py

import time
import Adafruit_DHT
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM) # GPIO Nummern statt Board Nummern
sensor = Adafruit_DHT.DHT22
pin = 4
RELAIS_1_GPIO = 17
GPIO.setup(RELAIS_1_GPIO, GPIO.OUT)

counter=0
mintemp=float(43.0)
maxtemp=float(44.0)

szeit=time.time() # startzeit
lzeit=25200 #laufzeit 7 std
while time.time() < szeit+lzeit:
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
    temp= round(temperature,1)
    if temp>maxtemp:
        GPIO.output(RELAIS_1_GPIO, GPIO.LOW)
    if temp<mintemp:
        GPIO.output(RELAIS_1_GPIO, GPIO.HIGH)

    # Nur für Testlauf
    # counter=counter+1
    # print "durchgang", counter
    # print "vergangene zeit", (time.time()-szeit)/60.0, "min"
    # print "restzeit", (szeit+lzeit-time.time())/60.0, "min"
    # print "temperatur:", temp
    # print "tempmesswert:", temperature
    time.sleep(30)
GPIO.output(RELAIS_1_GPIO, GPIO.LOW)

GPIO.cleanup()