Ultrasonic Sensor HC-SR04

Overview

Ultrasonic Transducers are those transducers which converts ultrasound waves into electrical signals and also vice versa. Ultrasonic transducers work on a principle similar to that of transducers used in radar and sonar systems, which evaluate attributes of a target by interpreting the echoes from radio or sound waves, respectively. Two types of ultrasonic sensors are available in market.  Active ultrasonic sensors generate high frequency sound waves and evaluate the echo which is received back by the sensor. While the Passive ultrasonic sensors are basically microphones that detect ultrasonic noise near them. Pin Configuration: Ultrasonic sensore available in market has 4 pins, which are:

1. VCC
2. TRIG
3. ECHO
4. GND

Capabilities: Ultrasonic transducers possess the following capabilities.

1. Used to measure wind speed and direction.
2. Speed through air or water.
3. Can generate sound waves of 18kHz.
4. Capable of detecting what is coming towards you.

Industrial Applications:

1. To detect movements of targets.
2. To measure distance between you and target.
3. Automotive parking technology.
4. Ultrasonic people detection.
5. Autonomous UAV Navigation.
6. For clear label detection.
7. Liquid level measurement.