Arduino-based automatic water level indicator and controller project we are going to estimate the water level using ultrasonic sensors.
The concept we have used here in our project where the water motor pump is automatically turned on when the water level in the respective tank becomes low.
Ultrasonic sensor HC-SR04 is utilized to estimate distance in the range of 2cm-400cm with an accuracy of 3mm. The sensor module includes an ultrasonic transmitter, receiver as well as control circuit.
The signals after striking an obstacle it will return back and are captured with the help of the receiver.