The two rods coming out of the IC are 1mm diameter carbon fiber (often used in model airplanes for lightweight structural support/control surface actuation). The carbon fiber acts as a rust proof version of the normally steel/aluminum resistive soil moisture sensors commonly sold online
The two rods coming out of the IC are 1mm diameter carbon fiber (often used in model airplanes for lightweight structural support/control surface actuation). The carbon fiber acts as a rust proof version of the normally steel/aluminum resistive soil moisture sensors commonly sold online
why not use capacitive sensing instead ?