in the arduino library for the DHT humidity/temperature sensors, apart of the more common DHT11 and DHT22, also the DHT21 is listed, but I don't see any project using it.
From datasheet it seems to me that DHT 21 and DHT22 are pretty similar.
I happen to have one of these DHT21 sensors.
Can anyone please tell me if I can basically treat it the same as a DHT22 (except of course declare a different type in the Arduino setup code) ?
Why they are not mentioned together with the '22 type?