seeed studio Grove Temperature Humidity Sensor Pro Module(AM2302/DHT22) Digital Interface 3.3/5V, Sensor for Temp(-40~80℃) Humi(0~99.9% RH) Monitor Compatible with Board Arduino/Raspberry Pi

This is easily in the top 5 worst shopping/customer service/return experiences I've ever encountered. They have this product line "Grove". This would indicate to you that there's pretty good cross-compatibility, right? Wrong! They're so turned around and confused that they have multiple compatibility matrices that conflict with one another. Just go check their website and look at all of their temperature sensor products alone. Go to their Wiki page where they list some compatibility. Oh this sensor only works with this hat and this board, but not if you have our latest and greatest hat. Oh, it also only works with this language. Trying to work within this ecosystem is like trying to put together a 2,000 piece jigsaw puzzle of a barcode of all 1's. I've spent hundreds of dollars and dozens of hours looking at this ecosystem and trying to get it to work to no avail. Any reader of this review should take away 2 important things: 1. Do no less than 50 hours of research of YOUR board and the sensors YOU want. I'd bet you won't be able to do it 2. Buy EVERYTHING on Amazon. Seeed's return policy is absolutely ridiculous and inconsistent. 5 days, can't be opened. Well what if a pin was bent in shipping and you didn't notice it? Tough! Oh and you have to pay "any additional fees" on top of return shipping. Vague, right? Hope this review saves someone else many dollars and much time. I'm going to end up buying raw sensors not tied to this terrible, non-compatible ecosystem.

As far as working it does. Example code can be found at the Grove website and also adafruit's. Reliablity, well that's another thing. For some reason the sensor drops to 32.0 deg. It's not in the code as I've used different code i.e. python, c, java and does the same at different intervals. Can't find any reason why this happens. just does. Set delays in reading from .2 to 4 seconds and still does it. Documentation states need 2 sec delay but no joy.

I bought 4 and they are all 10% below my w digital references devices.