How do I calibrate my STEMMA Soil Sensor to return volumetric water content (VWC)?

You can't. This soil sensor provides only a capacitive measurement. You could try to calibrate it against a known source, but this is NOT guaranteed to work.

What are the seesaw registers for the soil moisture value?

This is only needed if you are not using the Arduino or CircuitPython library. See the seesaw guide for general information on reading seesaw registers. The STEMMA Soil Sensor's reading is the capacitive measurement on channel 0. Base register = 0x0F and Function Register = 0x10.

This guide was first published on Nov 21, 2018. It was last updated on May 24, 2024.

This page (FAQ) was last updated on Mar 08, 2024.

Text editor powered by tinymce.