Hello, I have same problem. I use Arduino nano board and DHT22 senzor with 4,7k pull up resistor. I try several library but i still get 1% of humidity. Pls can someone help to me ???
Moderator: split of your topic as a thread on its own.
wrt your problem:
- try to calibrate the sensor?
- If you use my DHTstable library and you still get too low readings the sensor is broken.
Can you post the code you use? Maybe there is a programming error.
I used test program from GitHub - adafruit/DHT-sensor-library: Arduino library for DHT11, DHT22, etc Temperature & Humidity Sensors but i try other lib and unchangend test programs with same result. I bought it new from ebay it can be damaged. I try to order newone from different seller so I will see.
What calibration is need to do ?
Thanks
I use Arduino nano board and DHT22 senzor with 4,7k pull up resistor
I used 4 DHT22 (AM2302) from Ebay : all have an internal pull-up.
What's going on if you remove the pull-up 4,7K ?
I used test program from GitHub - adafruit/DHT-sensor-library: Arduino library for DHT11, DHT22, etc Temperature & Humidity Sensors
Although I use my own realisation because I prefer to read the directly microcontroler registers DDRX, PORTX and PINX , Rob's library is the best of those using Arduino functions.
Rob's library return error code,
Have you tried to display them.
I bought it new from ebay it can be damaged
I doubt.
Except big stresses due to cabling or powering mistakes, it is too easy to blame the hardware especially when it comes from Ebay.
FYI my DHT lib with error codes can be found here...
The temperature is okay ? it can go up and down ? and the humidity is always 1% ? That is a very strange error, but I guess the humidity part inside the DHT22 could be broken. Or perhaps it was a batch from the factory that was not calibrated. Try another one from another seller.
