Simple Water Level Indicator

Project

In this project I will show you how to build a very simple water level indicator.

The circuit is made up of NPN transistors that get turned on when a small current is fed into the base of it. The circuit works by having pieces of wire that are at varying heights and what the water level reaches a set point a small amount of current will flow from the power supply though the water into the base of the transistor.

I have used 5 transistors but you could add as many as you like. You will need to use some wire to create the electrodes in the water and you can cut them to the height you want the LEDs to turn on at. Below is shown how the circuit is made. You don't have to use an LED you could use a buzzer or use it to trigger another circuit.

Once the circuit is complete the LEDs should turn on when the water level is high enough.

Acknowledgement

I thank PCBWay & LCSC Electronics for the partnership.

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Website

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