Description: 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.
Based on 4 ratings:
2 of 2 found this helpful:
I’ve purchased 40-50 of these over a couple years and don’t remember any failures. Some have been outside through the summer, some not. I’ll post an update if I notice any.
1 of 1 found this helpful:
Have been using one of these for some months now, measuring humidity and temp in a environment with great fluctuations. Works perfect.
This is a great part and will yield a high quality temperature and humidity reading with none of the typical problems associated with analog readings, because you don’t read analog. It communicates over a single wire interface to the CPU. Unless you want to write a driver for the communications and data parsing, you need to get one to use this part. Sadly, as I’ve found with a lot of the stuff sold by Sparkfun, their software is often incomplete and the support is tough to work with. I have some notable “Shelfware”, such as the WiFly shield which I spend lots of time with and never got working correctly because Sparkfun did not release or support a working library for it, and when pressed, told me they would not support the library on GitHub that they refer you to. Coding a whole WiFi solutions was more than I bargained for when purchasing the part. Beware, just cause they show you a video of a working example does not mean that you will be able to download working code!
In the case of this RHT03, Arduino to the rescue. As I’ve found on other occasions, the quality of software available on the Arduino website is superior. There is a driver and application note for this part. Copy and paste the code, follow the instructions, wire it up and you’ll be getting nice readings.
Seriously Sparkfun, I’ve been down this road before. As founder of Measurement Computing (sold to NI in 2005), I understand electronics and support. It is just suicide to offer a product and represent that you support it, and that means having working software, then not do so. I suspect you are losing a lot of follow-on business from customers who can’t solve their problem with your buggy software, or move on and solve it with someone else, like I have with the WiFi. The folks at Spark Labs solved the arduino/wifi problem with a 100% supported and working solution, and that’s where I buy them.
Sparkufn, I like your variety and the quality of the hardware is always great, but the software… You need to do a better job, especially after the sale.
Thanks for the feedback. We are working to release more example code and hookup guides for our products. There are some products with holes in the code base. This can be caused by a number of factors. We do try to correct this when possible. Thanks and happy hacking.
The Temperature readings seem fine, but the Humidity values are always 98-100% after 6 month of use.