Operatiing Principle of Ultrasonic Sensor

As the name indicates, ultrasonic sensorsmeasure distance by using ultrasonic waves. The sensor head emits an ultrasonic wave and receives the wave reflected back from the target. Ultrasonic Sensors measure the distance to the target by measuring the time between the emissionand reception. The distance can be calculated with the following formula: DistanceL = 12 × T × C where L is the distance, T is the time between the emission andreception, and C is the sonic speed. (The value is multiplied by 12 because Tis the time for go-and-return distance.)

Arduino Project with Ultrasonic Sensor

Ultrasonic Sensor HC-SR04 is inexpensive andeasy to use since we will be using a Library specifically designed for thissensor. To use it with Arduinoyou would need an UNO R3 controller board.

Technical Specification

Power Supply :+5V DC

Quiescent Current : 2mA

Working Current: 15mA

Effectual Angle: 15°

Ranging Distance : 2cm - 400 cm 1″ - 13ft

Resolution : 0.3 cm

Measuring Angle: 30 degree

Trigger Input Pulse width: 10uS

Dimension: 45mm x 20mm x 15mm

Package Including

5 HC-SR04 Ultrasonic Sensors

10 Female-Male Dupont Cables

10 Female-Female Dupont Cables