HTU21D-F Humidity Breakout Board reading off

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FloatGeek
 
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HTU21D-F Humidity Breakout Board reading off

Post by FloatGeek »

Hey there I recently purchased a second HTU21D-F board and I noticed that the humidity reading was off by about 10% compared to the other HTU21D-F I have and some hygrometers I have lying around. Is there a way to calibrate this or do I need a new one?

Thanks much!!

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adafruit_support_mike
 
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Re: HTU21D-F Humidity Breakout Board reading off

Post by adafruit_support_mike »

Are the readings high or low?

Humidity sensors work by absorbing water vapor into a capacitor.. water is about 80 times stronger than air as a dielectric medium, so it's easy to measure small changes.. and sometimes the capacitor can get saturated. You can recondition a saturated sensor by baking it at 120C for an hour then letting it set at 25C and 70% humidity for 24 hours.

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FloatGeek
 
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Re: HTU21D-F Humidity Breakout Board reading off

Post by FloatGeek »

Yep the readings were high. Thanks for the response!

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