What is Ultrasonic Sensor?
An Ultrasonic Distance sensor is a sensor is used to measure distance. It uses ultrasound waves through ahead and receives reflected waves from the targeted object.

Physics behind distance measurement is in-between the time of sending and receiving of waves

It is used in various application in domestic as well as in industries.

How does Ultrasonic Sensor work?
The leaf-nosed bat uses sound waves & echoes a technique called echolocation to capture prey such as crickets. Bats are a fascinating group of animals. They are one of the few mammals that can use sound to navigate a trick called echolocation. 

Ultrasonic Sensor Pin Configuration

Pin NumberPin NameDescription
1VccThe Vcc pin powers the sensor, typically with +5V
2TriggerTrigger pin is an Input pin. This pin has to be kept high for 10us to initialize measurement by sending US wave.
3EchoEcho pin is an Output pin. This pin goes high for a period of time which will be equal to the time taken for the US wave to return back to the sensor.
4GroundThis pin is connected to the Ground of the system.

3D CAD file
http://grabcad.com/library/hc-sr04-ultrasonic-sensor

Projects using Ultrasonic Sensors


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