Water Level Controller With Buzzer

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Here is a tutorial for a water-level controller circuit with a buzzer. This project is simple and useful, the circuit is completely automatic. It controls a water pump and provides an alarm through the help of a buzzer for a few seconds to indicate when the tank is full and closes the 220V or 110V pump automatically.

This circuit can help you overcome a lot of issues in your daily life like water spillage, wastage, or not getting the tanks full properly. It will not only stops the tanks from overflowing but makes sure that they are filled till you desire.

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Hardware Components

The following components are required to make Water Level Controller Circuit

S.no	Component	Value	Qty
1.	Input Supply DC	5-16 Volt
2.	Dual Bipolar Timer IC	NE556	1
3.	Resistor	390KΩ, 560KΩ, 220KΩ, 270KΩ, 470R	2, 1, 1, 1, 1
4.	Ceramic Capacitor	100nF, 10nF, 10µF	1, 1, 2
5.	Probes	–	3
6.	Photocoupler	PC817	1
7.	Piezo buzzer	–	1
8.	Relay	–	1
9.	Diode	1N4007	1

NE556 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of NE556

PC817 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of PC817

Water Level Controller Circuit

Working Explanation

The operating voltage of this circuit is 5 to 16 volts. You can operate it with more than 12 volts then change the 470R resistor with 820R. Three probes are used in this circuit to sense the level of the water, two probes are placed at the bottom of the tank, or at the level where you want the pump to switch on. The remaining probe is to be set at the level where you want the tank to stop filling and switch off the pump.

A 556 timer IC is used in this circuit which is the dual version of a 555 timer IC. The circuit is working on this IC, it is responsible to switch on and off the pump according to the probe sensing. The relay used in the circuit should have the same value as the operating voltage, the pump is connected with the relay at the output. When the tank gets full the buzzer is activated for a few seconds and this time period depends on the 10uF capacitor. You can change or increase the time period by changing this capacitor.