Water level sensor circuit - Basic electronics circuits

A simple water level sensor circuit was posted on electroschematics.com. The simple water level indicator circuit presented on electroschematics.com makes this system automatic, i.e. it switches on the pump when the water level in the overhead tank goes low and switches it off as soon as the water level reaches a pre-determined level. It also prevents ‘dry run’ of the pump in case the level in the underground tank goes below the suction level.