Offline/online raspberry DHT22 every second


i have a raspberry and i installed a DHT22
i receive values normally but the device keep connecting/disconnecting all the time…
can someone help?
because of this problem i cannot control any other GPIO from the panel!!..
i run the default code :

import paho.mqtt.client as mqtt
import time
import sys
import Adafruit_DHT

time.sleep(30) #Sleep to allow wireless to connect before starting MQTT

username = ""
password = ""
clientid = ""

mqttc = mqtt.Client(client_id=clientid)
mqttc.username_pw_set(username, password=password)
mqttc.connect("", port=1883, keepalive=60)

topic_dht22_temp = "v1/" + username + "/things/" + clientid + "/data/3"
topic_dht22_humidity = "v1/" + username + "/things/" + clientid + "/data/4"

while True:
        humidity22, temp22 = Adafruit_DHT.read_retry(22, 04)

        if temp22 is not None:
            temp22 = "temp,c=" + str(temp22)
            mqttc.publish(topic_dht22_temp, payload=temp22, retain=True)
        if humidity22 is not None:
            humidity22 = "rel_hum,p=" + str(humidity22)
            mqttc.publish(topic_dht22_humidity, payload=humidity22, retain=True)
    except (EOFError, SystemExit, KeyboardInterrupt):


you can use the cayenne python library in case of the above to send DHT data to cayenne.


Hi Shramik.
I use this library already…
Do you see any issues concerning the timers of my script?
do you see any other issues concerning the code?


i am not sure why your code is disconnecting. it would be better if you could provide some log. is the disconnect still happening with cayenne python library code?


Looks like he is using the code from my project. If I had to guess @raceableability has another device using the same MQTT credentials. Try making a new device and using those.