![]() If the signal is received, then it is through high level.The module sends eight 40 KHz signals automatically, and then detects whether pulse is received or not. ![]() High level signal is sent for 10us using Trigger.The working principle of ultrasonic sensor is as follows: The sensor module consists of an ultrasonic transmitter, receiver and control circuit. There are many types of Arduino distance sensors, but in this project we have used the HC-SR04 to measure distance in range of 2cm-400cm with an accuracy of 3mm. We are going to use this same technique for this Arduino distance measurement project, so let's get started. As the speed of the sound is known to us, after some calculation we can calculate the distance. So we only need to calculate the traveling time of both sounds means outgoing time and returning time to origin after striking on the obstacle. When sound waves are transmitted in the environment then waves return back to the origin as ECHO after striking on the obstacle. The basic principle of ultrasonic distance measurement is based on ECHO. In this project, we have used the HC-SR04 Ultrasonic Sensor with Arduino to determine the distance of an obstacle from the sensor. This is an efficient way to measure small distances precisely. Previously we have also build many Ultrasonic Sensor projects like water level detecting, Ultrasonic Radar etc . It is used in several applications, like in measuring liquid level, checking proximity and even more popularly in automobiles to assist in self-parking or anti-collision systems. Ultrasonic sensors are great tools to measure distance and detect objects without any actual contact with the physical world.
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