emonTH v1 DHT22 self heating?

[Jon (Jon Murphy)]

there a good comparison on this website:

Testing and Comparing Low Cost Hygrometers

Compare DHT22, AM2302, AM2320, AM2321, SHT71, HTU21D, Si7021, BME280

 

The bottom line is the DHT22 wasn’t as accurate as hoped and was updated:

HTU21D / SI7021 Temperature and Humidity sensor, possible DHT22 replacement?

I’ve been evaluating the HTU21D temperature and humidity sensor made by Measurement Specialties as a possible DHT22 replacement for the emonTH. This is quite a new sensor, released in 2013. The Si7021 is also a possiblity with an identical pin-out. OctoPart list Datasheet Farnell item DFM footprint Digital, pre-clibrated I2C The metrics speak for themselves: [image] *Assuming 1 sample per min and sleeping in between samples, 1440 min per day = 86400s per day. See HTU21D testing repo a [su…