The one I got here works well. The difference between the AM2301/DHT21 and AM2302/DHT22 seems to be that the AM2301 is rated for a 3.3V supply. The DHT22 is rated for 3.5V and up.
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The one I got here works well. The difference between the AM2301/DHT21 and AM2302/DHT22 seems to be that the AM2301 is rated for a 3.3V supply. The DHT22 is rated for 3.5V and up.