Republic of the Philippines Department of Education

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3 LEDs Green, Yellow, Red

Light-emitting diode (LED) is a two-lead semiconductor light source that emits light when activated upon a certain program. The LEDs come in three colors: red, green and yellow. This signals the water level or distance detected by the ultrasonic sensor.


Functions to reduce the current flow, adjust signal levels, and terminate transmission lines.

Rechargeable Sealed 12v Lead Acid Battery

A low cost external power source able to provide high currents to power large appliances. The battery is mainly used by the water pump and is wired to a relay to regulate the energy consumption of the water pump.

Activated Carbon

It is a form of carbon consisting of small, black beads. It is used in water filters to remove dissolved impurities and removing organic compounds from the water. Activated carbon is mainly used in the filtration process of the drainage and filtration system.

Gravels and Sand

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