Sensor – Transducer – Detector Projects

Automatic Water Level Indicator and Controller using Arduino

In this Arduino based automatic water level indicator and controller project we are going to measure the water level by using ultrasonic sensors. Basic principal of ultrasonic distance measurement is based on ECHO. When sound waves are transmitted in environment then they return back to the origin as ECHO after striking on any obstacle. So we have to only calculate its traveling time of both sounds means outgoing time and returning time to origin after striking on any obstacle. And after some calculation we can get a result that is the distance. This concept is used in our water controller project where the water motor pump is automatically turned on when water level in the tank becomes low. You can also check this simple water level indicator circuit for a simpler version of this project.

Automatic Water Level Indicator and Controller using Arduino


  1. Arduino Uno
  2. Ultrasonic sensor Module
  3. 16×2 LCD
  4. Relay 6 Volt
  5. ULN2003
  6. 7806
  7. PVT
  8. Copper wire
  9. 9 volt battery or 12 Voltadaptor
  10. Connecting wires

Ultrasonic Sensor Module

Ultrasonic Sensor Module Automatic Water Level Indicator and Controller using Arduino

Ultrasonic sensor HC-SR04 is used to measure distance in range of 2cm-400cm with accuracy of 3mm. The sensor module consists of ultrasonic transmitter, receiver and the control circuit.

Circuit Automatic Water Level Indicator and Controller using Arduino

The ultrasonic sensor module works on the natural phenomenon of ECHO of sound. A pulse is sent for about 10us to trigger the module. After which the module automatically sends 8 cycles of 40 KHz ultrasound signal and checks its echo. The signal after striking with an obstacle returns back and is captured by the receiver. Thus the distance of the obstacle from the sensor is simply calculated by the formula given as

            Distance= (time x speed)/2.

Here we have divided the product of speed and time by 2 because the time is the total time it took to reach the obstacle and return back. Thus the time to reach obstacle is just half the total time taken.

Working of Automatic Water Level Controller

Working of this project is very simple we have used Ultrasonic sensor module which sends the sound waves in the water tank and detects reflection of sound waves that is ECHO. First of all we needs to trigger the ultrasonic sensor module to transmit signal by using Arduino and then wait to receive ECHO. Arduino reads the time between triggering and received ECHO.  We know that speed of sound is around 340 m/s. so we can calculate distance by using given formula:

Distance= (travel time/2) * speed of sound

Where speed of sound is approximately 340m per second.

By using this methods we gets distance from sensor to water surface. After it we need to calculate water level.

Now we need to calculate the total length of water tank. As we know the length of water tank then we can calculate the water level by subtracting resulting distance coming from ultrasonic from total length of tank. And we will get the water level distance. Now we can convert this water level in to the percent of water, and can display it on LCD. The working of the complete water level indicator project is shown in below block diagram.

Diagram Automatic Water Level Indicator and Controller using Arduino

Circuit Diagram and Explanation

As shown in the water level controller circuit given below, Ultrasonic sensor module’s “trigger” and “echo” pins are directly connected to pin 10 and 11 of arduino. A 16×2 LCD is connected with arduino in 4-bit mode. Control pin RS, RW and En are directly connected to arduino pin 7, GND and 6. And data pin D4-D7 is connected to 5, 4, 3 and 2 of arduino, and buzzer is connected at pin 12. 6 Volt relay is also connected at pin 8 of arduino through ULN2003 for turning on or turning off the water motor pump.

For More Details: Automatic Water Level Indicator and Controller using Arduino


Related Articles

Leave a Reply

Your email address will not be published.

Back to top button