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December 5, 2010
about 5 years ago
It does’t exsit RHT03 or DHT22 version. RHT03 and DHT22 are two different names for one same product.
We have three names for this product, the names are RHT03 DHT22 AM2302. So, be noted that you are using the same product.
I have asked our engineer to recheck if RHT03/DHTT22 could work under 3.3V DC this morning, the answer is RHT03/DHT22 could work properly under power supply of 3.3V DC.
I think you have to check if the power supply at RHT03’s power pin is >=3.3V DC.
Why not use C51 or AVR microcomputer to collect signal from DHT22, it’s more simple.
Thanks for your kind advice, fellows.
I have modified the spacing to 2.54mm in the datasheet, our engineer overlook this detail, thanks.
Customers can download new datasheet at
Regarding the pins, DHT22(RHT03) is designed to be soldered on circuit board, so the pins are flat. Connection with female header was not under considered when our engineer designed DHT22(RHT03).
So we can’t change the pins now.
I think you have to reset intervals from 1 s to 2 s at least, then it will be all right.
If you want to download better datasheet, please click this website to download
I have optimized the datasheet. The model RHT03 and DHT22 are for one same product.
By the way, please buy from Sparkfun.
Yes, DHT22 could be used outside. But it needs a cover to protect it from rain & exposure to sunshine.
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