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I know that BME280 measures pressure using the piezoresistive effect, I suppose it uses the thermoresistive effect to measure the temperature. How about humidity? Any advice would be appreciated, even starting points for a little Google-fu.

Datasheet: https://www.bosch-sensortec.com/products/environmental-sensors/humidity-sensors-bme280/#documents

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  • \$\begingroup\$ There are several types of humidity sensor in existence; without a datasheet (and possibly even with one) we can't tell which type the BME280 uses. \$\endgroup\$
    – Hearth
    Commented Mar 29, 2020 at 16:38
  • \$\begingroup\$ Seems the datasheet does not say. Why does it matter? \$\endgroup\$
    – skvery
    Commented Mar 29, 2020 at 16:50
  • \$\begingroup\$ @skvery - Schoolwork... But I already got a decent answer (with a reference, at that). Thank you for your time, anyway! \$\endgroup\$
    – Lukas O.
    Commented Mar 29, 2020 at 16:52

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Typically low cost RH sensors use capacitance measurement with a hygroscopic polymer layer.

See, for example, O’Dowd, J., Callanan, A., & Banarie, G. (n.d.). Capacitive Sensor Interfacing Using Sigma-Delta Techniques. IEEE Sensors, 2005. doi:10.1109/icsens.2005.1597858

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    \$\begingroup\$ Precisely what I was searching for! Thanks a ton :) \$\endgroup\$
    – Lukas O.
    Commented Mar 29, 2020 at 16:51
  • \$\begingroup\$ You might want to wait 24h before accepting the answer, in case something better comes along. \$\endgroup\$
    – Spehro 'speff' Pefhany
    Commented Mar 29, 2020 at 16:53
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    \$\begingroup\$ Wise advice. Cheers. \$\endgroup\$
    – Lukas O.
    Commented Mar 29, 2020 at 16:54

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