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I use a wemos D1 with a loose DHT22 to measure humidity. I connect the dht22 with a 10K resistance. Pin 3 (NC) is not connected. I use GPIO 14 for data. I also have tried different esp megabuilds. I also tried to power the dht22 with 5V and 3,3V. I nothing change to the part 'hardware' in esp. Everything I try results in the same problem: within a couple of hours I get 'nan' as value. I googled on this problem but I don't see a clear solution. I am about to give up but maybe someone here have a solution?
Please have a look at the more recent discussions about this in the GitHub issues list: https://github.com/letscontrolit/ESPEas ... open+dht22
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