In the water level sensor schematic, the common probes connecting the underground tank and the overhead tank to +9V supply are marked ‘C’. The other probe in underground tank, which is slightly above ...

The XBee can detect the water level by testing for a closed circuit between the two electrodes of any sensor module. The water acts as a sort of switch that closes the circuit.

🔹 Circuit Diagram. The system is designed to interface the soil moisture sensor with the 8051 microcontroller. The relay module controls the water pump, which is powered ON/OFF based on sensor ...