Capacitive soil moisture sensors are very sensitive to salt content unless the frequency is high (> 50 MHz). This design appears to operate at 0.5 MHz. I experimented with a sensor like this for ...

Posted in green hacks Tagged capacitance, capacitive, houseplant, moisture, plant, sensor, soil, stm32, water Post navigation ← A Foot Pedal To Supplement Your Keyboard ...

We use the built in capacitive touch measurement system built into the ATSAMD10 chip, which will give you a reading ranging from about 200 (very dry) to 2000 (very wet).

Yongkun, Madhur, and Anupam's work on biodegradable soil moisture sensors was published in ACS Sustainable Chemistry and Engineering! ... Controlled Biodegradation of an Additively Fabricated ...