DHT22 alternatives that can plug directly into the EmonTH?

I have about 25 sets of EmonTH running for about 1.5 years so far.  The set that I use for sensing outdoor air (tropical climate, but sheltered from direct sun and rain), has gone through 2 pieces of DHT22, each one surviving about half a year. I have received spare DHT22 in the mail from OpenEnergyMonitor after explaining my situation.  However, many of the other 25 sets of EmonTH show definite signs of RH% drifting, their temp readings are relatively stable.

It would seem that DHT22 cannot be relied upon for reliable long-term humidity monitoring.

There is a thread here where people have confirmed DHT44 (aka RHT05), a long-wire-type-sensor as a direct replacement, but I don't know if that's going to do better in long-term reliability than DHT22. 

Does anyone know which Sensiron SHTxx products will be a drop-in replacement in emonTH?  SHT71 has 4 legs at 1.27mm pitch, and can use a header to adapt to the 2.54mm pin pitch matching DHT22.  But the output signalling of SHT71 is given as "digital (2-wire Interface)".

Some info: www.kandrsmith.org/RJS/Misc/calib_dht22_dht11_sht71.html

jvda's picture

Re: DHT22 alternatives that can plug directly into the EmonTH?


I am also interested in replacing my DHT22 sensor of my emonTH with a better one as I am also suffering from poor RH% readings.

I have also found this forum thread: https://community.openenergymonitor.org/t/htu21d-temperature-and-humidity-sensor-possible-dht22-replacement/1106

This thread speaks about candidate replacement sensors, but doesn't mention yet which one(s) can be used as actual replacement in emonTH and how the replacement should be done.


Robert Wall's picture

Re: DHT22 alternatives that can plug directly into the EmonTH?

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