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  • Overall Rating: 4
  • Price: 5
  • Quality: 4
  • Ease Of Use: 4
  • Usefulness: 4
Not the most accurate – DHT11 Arduino Compatible Digital Temperature Humidity Sensor Module Reviews

posted by davet76 on 04/18/2013 Certified Owner

Involvement:Expert (understands the inner workings) - Ownership:more than 1 month

Pros:
Easy enough to wire up - the middle pin didnt appear to be labelled but S is signal and - is ground so the middle one must be power, I think it can take 3.3V or 5V in
Cons:
Poor accuracy at lower temperatures - seems to be reading about 5 degrees too high. Also I think the humidity might be out There was no documentation, but you can look it up There is a procedure to recalibrate the device through some extremes, I haven't tried this. With time the response deadens a bit
Other:
Good instructions on the web - they recommend putting a resistor to connect signal to ground (I think that was it) - I found this wasn't necessary but there was the occasional dropped data (check the serial monitor to see) There are also good tutorials on the web to set this up and connect to Cosm if you have Arduino wtih ethernet shield - put the data online
Bottomline:
Its okay but no the most accurate. Not sure if DHT22 is better.

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