Hi. I’m trying to get my photon to publish the temp and hum from my DHT22 to the cloud. It’s publishing values of temperature of 0 and humidity of 6553%. It’s not cold or raining where the device is. Here’s the code: // This #include statement was automatically added by the Particle IDE. #include <…

Hi again! Changing the library from <Adafruit_DHT.h> to <Adafruit_DHT_Particle.h> fixed my problem with the DHT22 AM2302 sensor. I hope this works for you as well! Regards

@ctmorrison , the DHT22 is on a board which has the pull-up on it and it is definitely required.

@peekay123 , I’m confused by your comment. You appear to be disputing my comment about the need for an external pull-up. However, from Adafruit’s product description: “Comes with a 4.7K - 10K resistor, which you will want to use as a pullup from the data pin to VCC.”

@ctmorrison , LOL. I agree that a pull-up is needed but the OP’s DHT22 module comes with on built-in :wink:

@peekay123 Serial.print statements have never worked for me. Looked into it and it’s probably something to do with the photon driver (which I don’t think I can manage because I only have a work computer and no privileges to make the changes). I’ve put in some delays between the Particle.publish() st…

It was this version of the board that influenced my purchase - I have little experience in electronics. It only has 3 pins: +ive, out, -ve:

Hi Ashley( @Blacksmithash ), I have the same problem as you. Did you ever manage to solve this? B

I have found the DHT22 can be a bit erratic on both the first cycle in the loop or if you poll it to regularly. I tend to check with 1 minute plus intervals. Even then I still get the odd rogue value so I sometimes check the value is not too different from the previous one and within sensible thresh…

I have gone to using the SHT31 because of unreliable readings from DHT22. It has been very reliable for me.

Hi @BenHadman and @Blacksmithash . I too have exactly the same problem with my DHT22 AM2302 sensor. Do any of you manage to fix this? I tried my DHT11 sensor and had a similar problem. It only returned hum = 255% and temp = 0. Regards

DHT22 returns temp = 0, hum = 6553

Hardware

funman1 November 7, 2021, 8:07pm 32

Update: This is what solved my issue for now

Topic		Replies	Views
[SOLVED] DHT22 issue with Photon Troubleshooting	34	17537	July 19, 2016
Updated 2.2.0 and now all my DHT Sensors no longer work Just read 0 and 6553 [SOLVED] Libraries photon	5	723	November 7, 2021
Publish DHT22 to Cloud [SOLVED] Troubleshooting	10	3631	January 22, 2016
PLEASE do not use the idDHT22 library Libraries	17	5137	October 25, 2015
DHT22 w/ Particle Photon Education	6	1760	April 14, 2021

DHT22 returns temp = 0, hum = 6553

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