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blakadder 2019-11-08 18:28:30 +01:00
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Honeywell-HIH.md

@ -59,3 +59,5 @@ The go-to humidity sensor for the DIY Arduino/ESP8266 community is the DHT22. U
After looking at several options, I found the Honeywell HIHxxxx sensors. Different models of the HIH line have different features and work over different ranges of humidity, but most of them use the same I2C protocol, which is now supported in Tasmota. Check the [datasheets](https://sensing.honeywell.com/sensors/humidity-sensors) to compare sensors. One of the most critical features to look for is a hydrophobic filter which allows humid air through, but blocks water droplets from entering the sensor. This is listed on the datasheets as "with filter,condensation resistant". Also keep in mind the humidity range you'll be measuring.
For my purposes (bathroom humidity sensor), there was a clear choice in the HIH7121-021 ([datasheet](https://www.mouser.com/datasheet/2/187/honeywell-sensing-humidicon-hih7000-series-product-1140774.pdf), [non-affiliate direct link to product on Mouser](https://www.mouser.com/ProductDetail/Honeywell/HIH7121-021-001?qs=sGAEpiMZZMsrQJTAfdCBRHqyplkhxKu6kqHzVrlY%2FZM%3D), which works over a range of 0-100% RH, supports I2C, is accurate to within 3%, and has a hydrophobic filter. The article focuses on that sensor, but I suspect much of the information will be applicable to other HIHxxxx sensors.
by [@thepotoo](https://github.com/thepotoo)