ESP8266 with DHT22: sometimes no values received

[freijn]

Old post new 'results'

After having a summer season running error free , last week the sensor did start erroring again #$%#$%@@$#

Difference ???

Due to autumn start we turned on heating. The thermostat leads are in the same cable as the DHT22. Apperantly the input of the ESP doesn't like the switching of the thermostat ( 24 volt on off).
I think I will make a separate cable for the thermostat and keep the DHT22 in the shielded cat3 cable. Will also connect the shielding to earth now.

I thought mentioning this might help others with similair issues.

Cheers,
Frank

[grovkillen]

Great feedback! Thanks.

[TD-er]

You could also try to twist the cable.
Just like the cabling in CAT5 ethernet cables.

[litris]

Hi there,

I'm having the same issue when reading a DHT22 sensor from one ESP8266 with EasyESP 2.0 version flashed. I only get valid readings 1 out of 5 measures (aprox). Other's just get a "No Readings!" reply.
I'm using a pull-up resistor and the sampling period is 60 seconds. I've also tried to increase a bit the 3V3 power voltage, and to decrease the sampling frequency but with the same results.

I think it can be related with this topic:
https://github.com/adafruit/DHT-sensor- ... /issues/48

Does anybody know if this improvements have been updated to the EasyESP code? Or any rule to pull-down the line when signaling stars?

Thanks in advance,
Regards

New update.

I've downgraded the firmware to R120. The sensor is working fine, and all readings are collected.
So, it seem's to be a bug in the 2.0 release.

[litris]

Update.

I've downgraded the firmware to R120. The sensor is working fine, and all readings are collected.
So, it seem's to be a bug in the 2.0 release.

[TD-er]

Can you add an issue on Github for it, with as much information as you have. (e.g. logs from ESPeasy)

[litris]

Issue added:

https://github.com/letscontrolit/ESPEasy/issues/899