Electronics notes/humidity sensing: Difference between revisions
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Simple humidity sensors are often resistive or capacitive sensor | Simple humidity sensors are often resistive or capacitive sensor | ||
'''Resistive humidity sensors''' | '''Resistive humidity sensors''' | ||
* less sensitive than capacitive | * less sensitive than capacitive | ||
* tend to also vary with temperature, needing correction by a closeby temperature sensor | * tend to also vary with temperature, needing correction by a closeby temperature sensor | ||
'''Capacitive humidity sensor''' | '''Capacitive humidity sensor''' | ||
* more sensitive than resistive | * more sensitive than resistive | ||
* e.g. [[Electronics_notes/Temperature_sensing#DHT11.2C_DHT22|DHT11]] | * e.g. [[Electronics_notes/Temperature_sensing#DHT11.2C_DHT22|DHT11]], quoted at 5% | ||
It seems hard to push humidity accuracy below 5%, but whether any one sensor is actually +=10% or ''mostly'' += 3% or so varies | |||
https://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html | |||
Expect the capacitive to perform a little better than capcitive. | |||
sors) | |||
DHT11 | |||
DHT22 (AM2302) | |||
AM2302 (DHT22) | |||
AM2320 / AM2321 | |||
Si7021 | |||
HTU21D | |||
BME280 | |||
DHT22, AM2302, AM2320, AM2321, SHT71, HTU21D, Si7021, BME280 | |||
https://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html | |||
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There are also '''dewpoint detectors''', often | There are also '''dewpoint detectors''', often chilled mirror hygrometers | ||
http://en.wikipedia.org/wiki/Hygrometer | http://en.wikipedia.org/wiki/Hygrometer | ||
Revision as of 14:32, 9 August 2023
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
There are also dewpoint detectors, often chilled mirror hygrometers
http://en.wikipedia.org/wiki/Hygrometer
See also Humidity