Water Level Indicator with alarm using IC CD4066

What is water level indicator: Water level indicator is a device which is used to measure the level of water or any other conductive liquid in a container. By following a very simple circuit this device can be implemented . Along with indicating the water level it will also give you a alarm when the tank becomes full.

How it works: This device works simply by closing the circuit with the conductivity of liquid . As you see in below given circuit when the container will be empty the circuit will be open hence the resistor implemented will makes the switch open and hence LED will go off. Similarly when liquid will comes up to the first installed probe it will close the circuit between base probe and first probe so the LED will glow on indicating the water level. 

Requirement : To implement this project you will require

• a 6 V supply
• 4 no. of LEDs
• 4 no. of 330 ohm resistors
• 4 no. of 180K resistors
• 1 no. of 2.2K resistor
• 4 no. of switches (IC CD4066)
• a piezoelectric buzzer
• a SPST on/off switch
• a Transistor BC148

Circuit Diagram:

When the tank got full the base of the transistor will go high which actually will saturate the transistor and the SPST switch will go on and alarming the buzzer.

If you want a water level indicator along with controller than go for this Water level Controller Circuit. This will makes your pump on and off according to water in your tank.