Hall effect sensor as Toilet Tank Refiller

  
The 12 Volt power in my application comes from a small solar power system, it may also be provided by a suitable wall-wart DC power supply. The cistern is located below the toilet tank, the pump moves the water up to the toilet`s tank. The pump is switched on when the toilet tank is empty, it is switched off when the tank has filled.
Hall effect sensor as Toilet Tank Refiller - schematic

The Panasonic hall effect sensor is the heart of the system. The hall effect sensor`s output pulls to ground when in the presence of a relatively strong magnetic field. When the magnet is pulled away from the hall effect sensor, the output goes high



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