DTH22 Freeze from 8 to 14h of run

[seb42fr]

Hello,
I have buy 3 DHT22 ESP8266 module.

Capture d’écran du 2022-12-31 14-30-31.png (139.57 KiB) Viewed 1251 times

I have same problems on these modules.
After many hours of run, the value of DHT22 probe read by ESP is freeze. I have make some test, but nothing work :
- Disable the Serial port in Tools/Advanced
- Decrease the I2C speed
- The reboot the ESP with Web interface is not unlocking it
- The hard reset of ESP8266 is not unlocking it
- The unplug and plug the ESP of header block is not unlocking it
I must make a power-off and a power-on of the module and the measurement come back ... for some hours

Any Idea ?

The device page:

Capture d’écran du 2022-12-31 14-15-21.png (72.83 KiB) Viewed 1251 times

The domoticz measurement of three equipment who was started at same time:

Capture d’écran du 2022-12-31 14-27-21.png (47.76 KiB) Viewed 1251 times

Capture d’écran du 2022-12-31 14-23-21.png (52.91 KiB) Viewed 1251 times

Capture d’écran du 2022-12-31 14-26-28.png (52.6 KiB) Viewed 1251 times

Thank you
Seb

[Ath]

What exact .bin file do you have installed on the ESP?

[Bert'Ridder]

Hello,

These ESP-shields do I als use, but a few of them have the same issue.

t is in my case a hardware-problem of the Powersupply-chip on the board.

Please check, with an ".bin" that has the VCC on it and then check the system-variable %vcc%.
In my cases the result was that the VCC as about 3,6 V. The 8266 can only accept about max 3.5 V and then after some time working with an too high Voltage the 8266 freeses.

Also try to extend the Task - Interval from 2 seconds to at least 10 or even 30 Seconds. This also can freese the DHT22

[TD-er]

DHTxx sensors tend to do this.
The DHT11 even more than the DHT22.

Just google on them.
For example the first hit when searching for "DHT22 freeze": https://discourse.nodered.org/t/dht22-f ... on/20174/2