Watering unit sensor calibration

[gantini]

I am using the watering.ino example

https://github.com/m5stack/M5Stack/blob/master/examples/Unit/WATERING/WATERING.ino

How should I interpret the humidity sensor values? Is there a way to do a calibration? I get values ​​of about 2100 for the sensor in air, 1800 if wrapped in a wet rag and 1500 if immersed in water.

thanks

[ajb2k3]

@gantini The sensor is a capacitive sensor and so the higher the reading the lower the moisture level.
These are superior to the resistive sensors that rot easy but work the same way.