Simple Water Level Indicator Circuit

DIY Projects | Water Level Warning Alarm Circuit

A Water Level Indicator Circuits is an electronic circuit which indicates the various levels of water inside a tank.

This happens when rising or dropping water levels come in contact with the respective water sensors arranged step wise inside the water tank at different depths.

Utilizing Water's Conductivity

We know that un-distilled water conducts electricity, although with some resistance. The resistance may be anywhere from 100K to 500K, depending on the purity level of the water. This property can be effectively used for switching transistors ON/OFF. We use this characteristic of water to switch the base of a series of BJTs sequentially as the water level goes up and down across the sensors attached with the respective transistor bases.

How Water Level Indicator Circuit works

In this Water Level Indicator Circuits project we used very simple idea The Negative terminal of the supply can be seen immersed at the lowest level of the tank, so that water is in contact with this Negative even at the lowest level.

The bases of the respective transistors are arranged sequentially across the water tank depth, such that when the water fills the tank, it sequentially connects the positive supply with the relevant BJT bases through the rising water level. When this happens, the transistors begin getting biased one by one, illuminating the collector LEDs in the same sequence. When the water reaches the full level, the buzzer is immediately sounded by the topmost transistor T4. This helps the user to get a clear idea of the water level, and also when the water has reached the overflowing level.

Water Level Indicator on the Breadboard

Before finalizing your water level indicator circuit, it's advisable, especially for beginners and students, to first build and assemble it on a breadboard. This step ensures an easy and practical testing phase, allowing for adjustments and improvements before moving on to the final configuration. How to build this project on the breadboard you can visit this link

Water Level Indicator on the Veroboard

Once you've completed your project on the breadboard, transitioning to a more permanent setup on the veroboard is a practical and straightforward approach. This step ensures a more stable and durable configuration for your project.

Water Level Indicator on the PCB

If you're familiar with PCB design, building the water level circuit on a PCB is an excellent practice. Simply follow the detailed diagram to create your custom PCB, allowing for a more polished and permanent implementation of the water level sensing system.

Water Level Indicator Component Layout PCB

Water Level Indicator PCB

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