DIY Project:

Water pump operated by water level sensor

(Using two copper rods)

Today I want share the simple idea how to building water pump for tank using two copper rod as

water level sensor. This project is suitable to operated 12 Vdc motor pumps. For example like as

aquarium pump. I have used two cooper rods to detect the water level position which it working

as the sensor or switch. Initial stage, the two copper is operated as open circuit and pump is start

to running. When both of copper sense the water through it, it will operated as short circuit. That

signal from copper will send to pump for make it stop to operate.

For build this project, we need to integrate two circuits. The circuits are H-bridge circuit and

comparator circuit. I have use L293D for build H-bridge circuit and use LM324 for build

comparator circuit.

Component of my project:

1. L293D

2. LM324

3. Potentiometer 10KΩ

4. Resistor 4.7kΩ

5. Resistor 10kΩ

6. PCB board

7. Screw terminal 3 way

8. Screw terminal 2 way

I have attached my circuit for we share together.

L293D

To Motor

LM324

To copper rod

5V

0V

12V

This PCB circuit for this project: