In this Arduino based automatic water level indicator and controller project we are going to measure the water level by using ultrasonic sensors. The basic principal of ultrasonic distance measurement is based on ECHO. When sound waves are transmitted in the environment This concept is used in our water controller project where the water motor pump is automatically turned on when the water level in the tank becomes low. You can also check this simple water level indicator circuit for a simpler version of this project.
Video Link- https://youtu.be/07G1xSvs0s8