Sensor DHT22 on modul A16

[twostar]

Yes, there are different types of sensor sold as DHT22, the four-lead one is just the raw sensor while the three-lead ones have internal pullups and possibly other circuitry as well, which may be why it works at 3V rather than 5V.  Doing a search for ones on sale in my country, about 75% of them are the three-lead ones with pullups, only 25% are the four-lead ones without pullups.  I've ordered one of the four-lead ones and will report results when it arrives.