In this video, I show you how I calibrate a lowcost capacitive sensor to measure the water content (as % of total potential water held by the media) of a hydroponic medium (in my test case, rice hulls mixed with river sand).

A blog post about this process https://scienceinhydroponics.com/2021...

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Arduino MKR Wifi 1010
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Capacitive moisture sensor sensor
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Scale building kit
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Beaker set
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Ribbon cable package
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