It emits an ultrasound at 40 000 Hz which travels through the air and if there is an object or obstacle on its path It will bounce back to the module. Considering the travel time and the speed of the ...

This is a simple guide on how to make a distance detector using an Arduino, a HC-SRO4 Ultrasonic Sensor,LED's.The ultimate goal of this tutorial is to use the LED's to display how far the object is ...