Water Level Indicator Using IC

Busy This Device For Full Control

Water Level Indicator

AliExpress.com Product – Electronic Temperature Sensor Liquid Depth Indicator Time Alarm Transmitter Measuring Tools Ultrasonic Water Tank Level Meter

Water level indicator is a system which gets the information about the water level in tanks which is used in homes and public places. We can control overflow of water tanks by using the tank level indicator. As every body know When the water is stored in the tank, nobody can identify the actual level of water in the water tank. That is way mostly water tank overflow and its great loss of water as well as electricity.

Water level indicator

In this simple water level indicator project we have used a Switching IC ULN 2003  to indicate the water in the tank. Now a days many projects on water indicator are available such as slope indicator water level meter, Digital water level indicator, Water level indicator using transistors,water level indicator alarm and etc.

Water Level Indicator Using IC ULN 2003


In this circuit we are using switching IC ULN 2003 commonly used switching IC. Components used in this Projects are as:

  • ULN2003 is a high current and high voltage Darling-ton array IC. It consists of seven open collector darling-ton pairs with common emitters. Darling-ton pair is an arrangement of two bipolar transistors. It is a relay driver IC other types of similar ICa are high side toggle switch, low side toggle switch, Darlington transistor, bipolar NPN transistor, N-channel MOSFET, ULN2003 driver IC etc.
  • LED s this ic has 7 output pins that is way we are going to use 7 LEDs as water Level indicator in the tank. These LED s will glow according to the Level of water in the tank.
  • Battery: A DC supply of 9V is given through a  battery to power up the circuit or you can use 9 to 12v DC supply as power.
  • Resistor 220 ohm resistors are used in this circuit to protect the LEDs because we are using 9 volts to 12 volts power supply.

Circuit Diagram of final projects

Water Tank Level Indicator

I this following animated circuit diagram we have cleared all components with their connection you can use long wires according to the distance of your tank to electric board.

Water Level Indicator Using Alarm

We can also use alarm with this circuit. It will Alert you that now the tank is full and you should turn off the water pump.


Tank Level Indicator Auto Powered off

We can also use a Cut off Relay with this circuit, When the Tank will be full relay will cut off the power automatically.

Water Tank level indicator

In this circuit given about we have cleared all connections with auto cut off water pump When tank will be full water Pump will auto turn off because a relay is connected with 7th output of ic.

ULN2003 Pin Description

Pin No
Functions of all Pins 
Input for 1st channel (envirementalb.com))
Input 1
Input for 2nd channel
Input 2
Input for 3rd channel
Input 3
Input for 4th channel
Input 4
Input for 5th channel
Input 5
Input for 6th channel
Input 6
Input for 7th channel
Input 7
Ground (0V)
Common free wheeling diodes
Output for 7th channel
Output 7
Output for 6th channel
Output 6
Output for 5th channel
Output 5
Output for 4th channel
Output 4
Output for 3rd channel
Output 3
Output for 2nd channel
Output 2
Output for 1st channel
Output 1

Thanx for visiting our post if you want to ask any question about the electronics projects you can freely ask………

More  Electronics Projects

Water Level Indicator using Transistors



39 thoughts on “Water Level Indicator Using IC”

        1. Take a piece of water paip and attache sensor wires on this paip
          After attaching wires put this paip in your water tank

    1. good day, I hope you are well, hey I liked your design, I occupy 2, one for my tank and another for my elevated tank, I would like to occupy them, but connecting them to the electricity supply, here in Mexico is 110 Volts.
      Can you support me with the manufacture of them and what would cost per piece, with everything and shipping?
      I occupy the cables that go to the water of 10 meters. I here, I would cut them at the distance desired according to the size of the tank.
      Thank you ..!!

    1. dear just take an ic ULN2003 from electronics shop and 7 leds any color and pieces of wire (length from water tank to your board) and then reply me i will guide you in detail

  1. Please make a Video how to use relay and which relay should be used to control motor? Another question is coming in my mind. Motor is 240v and circuit is 9v then is it possible to control the motor.

  2. how is the calculation of volts, if the box of water is very large, and the electronic plate is very distant from the box of water?

  3. Please send me your WhatsApp number because I ask you something about Water level indicator I am very confused…??

      1. Mujhe relay ka bilkul samjh nahi aya ma buzzer ki jagah relay attach karna chata ho jis se water pump auto off ho Jay mujhe full circuit samjh a gya ha bas ye bta do k kon si relay use ho gi or kis tarha relay ki motor k sath wiring ho gi ?

      2. Or relay k sath kuch lagy ga to nahi relay direct lagi gi Bhai mujhe easy way me ye samjha do bas?

  4. Hello Sir!!! Nice job!!!!!! What about more sensors? I like to measure more than 6-7 water levels points for more accuracy. can be used 2 IC in “some cascade” mode? Could you show me how to do that or give some advisory and/or where to look?
    Thanks a lot in advanced!!

  5. I found a fault in this circuit. The fault is that when tank will full then pump will automatically off but when the water level will little bit low then pump will again On and start to full the tank, this will have been done continuously.

    1. sorry for late ans
      yes if you use full circuit as tank will be full water pump will be shut down through relay
      plz what is fault in this circuit inform me and what you want to do….?

Leave a Reply