Ultrasonic Sensor

HC-SR04

An Ultrasonic sensor is a device that can measure the distance to an object by using sound waves. It measures distance by sending out a sound wave at a specific frequency and listening for that sound wave to bounce back. It is important to understand that some objects might not be detected by ultrasonic sensors.

The Ultrasonic Sensor sends out a high-frequency sound pulse and then times how long it takes for the echo of the sound to reflect back. The sensor has 2 openings on its front. One opening transmits ultrasonic waves, (like a tiny speaker), the other receives them, (like a tiny microphone).

ultrasonic sensor

Hardware Connections

-->  Vcc to 5V

-->  Gnd to Gnd

-->  Trig to digital pin 13

-->  Echo to digital pin 12

Specifications

Board Size 43 x 20 x 15 mm
Working voltage 5V DC
Operating voltage 5V DC
Working Frequency 40Hz
Range 2 cm to 400 cm (4 m)
Measuring Angle 15 degree
Trigger Input Signal 10 μs TTL pulse
Echo Output Signal Input TTL lever signal and the range in proportion

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