As I await my replacements parts I figured I’d try a few ideas to attempt a recovery of the defective DHT22.
The first thing I decided to do was to remove the DHT22 from its partial enclosure. (Sensor part was exposed)
Reconnected the sensor node and …. it’s still stuck at 99% humidity.
I blew on it and the temperature changed but not the humidity.
Now that the sensor was out of the enclosure I figured I’d try to put more air past it. Using a blow dryer on cool setting I set it on the DHT22 for a little bit. Nothing.
Okay. Does it need to be reset I thought to myself? It did die when as it’s been out for so long. Perhaps the relative humidity sensor is out of calibration.
I wonder if calibration could be edited in the nodemcu.
In any case I decided to try the blow dryer with the heat setting on as it would reduce the Relative Humidity dramatically.
Which it did very nicely. About a minute.
Feels like 190c. ^_^
Ok so the humidity sensor does move. Surely it just needs recalibration.
There is a sunny break and no rain at the moment in this almost 19day cloudy streak.
Both google and Apple report about 64-65% humidity.
What does the DHT22 report?
Let’s try again
I guess waiting for the replacements is the only thing left to do. Unless it’s possible to recalibrate.
**Just had a quick look online. It would seem as though this sensor is self calibrating. Which means that my experience was/is with broken DHT22s.