The RHT03 (also known by DHT-22) is a low cost humidity and temperature sensor with a single wire digital interface. The sensor is calibrated and doesn’t require extra components so you can get right to measuring relative humidity and temperature.
Posted by Unknown on 17th Jul 2015
I bought this DHT22 sensor to replace another one I had used out of doors with an Arduino logging system for about a year. The old one was probably reading slightly high for temperature, and far too dry (5 to 10%) for RH. With no changes to the software, the new one agrees better for temperature with another thermometer, and the RH values now lie in the more typical outside range of 50 to 80%. It could be that the old one had deteriorated, but in semi-rural air in a sheltered location that's not long. The specification of the sensor is much better than this, and is why I bought a DHT22 rather than the far cheaper DHT11.
The nice thing about this sensor is that it has a good open housing in white plastic, which at least looks like that some thought has been given to its exposure as an environmental sensor.
Posted by kannan on 6th Mar 2014
I would probably order the cased one next time as I didn't realise this is really meant to be PCB mounted... otherwise performs as specified and does the job!
Posted by Unknown on 11th Feb 2014
once I had sorted the arduino code directories on the PC, all went to plan, then ported to the Raspberry pi, and same again, care with directory structure, and all was well.
Posted by Chris on 6th Jan 2014
More stable than a TMP36 and with added humidity. I found the TMP36 had to be averaged out but this sensor is steady.
A great little sensor for those starting out Arduino or Raspberry Pi. Either upload the data or put on an LCD display.
A little pricey but worth it.
Posted by Hercules on 6th Jun 2012
very helpful company, excellent sales and tech team
Posted by Gareth Halfacree on 26th Sep 2011
The RHT03 (the actual product supplied, which is identical to the DHT22) is quick, accurate, and works on a single wire - but it's also pretty expensive.
There's a full review - plus a link to an Arduino library for communicating with it - over here:
All prices are in GBP.