Hi,
I have a few DHT22’s but am not happy with them, they all seem to report at least 2 degree’s higher than the real temp! Is there a more accurate alternative for monitoring temp?
Im running them from a nodemcu and thought it was the heat from generated from this that was causing the issue but even if I mount them outside the enclosure I have the same problem
As the saying goes : if you have one watch, you know the time. If you have two, you don’t. Same goes for thermometers. However, these are pretty accurate, using a ESP32 to read them out.
How do you know what the “real” temp is? What are you using that is more accurate?
A genuine DS18B20 should be more accurate for temperature (+/- 0.5 as opposed to +/-1.0 for DHT22).
[edit] If you need humitidy as well try the Si72021.
How do you find the update rate on those francis?
I found the CGG1 pretty woeful: Temperature and Humidity Sensor - UK
The script I use on the esp32 reads ( at the moment) 4 of them, one every 30 seconds.
Thanks I might revisit using these sensors again.
The DHT22(AM2302) is =/- 0.5°C
There’s a round up of readily available sensors here
Unfortunately it’s almost useless for determining absolute accuracy as they had no standard to measure against.
