Over Head Tank Water Level Indicator and Motor Protector
The above circuit has been presented on request from one of my followers, Prateek. The A to E wire ends of the circuit are placed in the shown order inside the overhead tank. The level of the water is indicated by the LEDs, which light up as the water climbs inside the overhead tank.
The couple of terminals at F should be placed at the point where water enters the motor pump, located beside the underground tank. The terminal pair must be secured at least an inch apart over a plastic strip, making sure no residual water gets accumulated across these two points when actual water supply is over.
The gates are all from the IC 4049, the input resistors across the input of the gates and the positive are all 1M, rest of the resistors are 1K, the transistor is BC547, relay is 12 V, 400 Ohms, SPDT type.
The supply to the circuit can be made through a 12 volt DC adapter or a transformer, bridge, capacitor network.