Introduction: Ultrasonic Sensor HC-SR04 With Arduino

Picture of Ultrasonic Sensor HC-SR04 With Arduino

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The HC-SR 04 is famous ultrasonic range sensor, and its very easy to use with many microcontrollers. This article will give you idea about to interface ultrasonic sensor with arduino board.

Step 1: Make Connections

Picture of Make Connections

Here the circuit constructed for to identify the range limit with warning beep sound. This circuit have minimum components such as arduino development board, ultrasonic sensor HC-SR 04 and a buzzer.

Step 2: Arduino Code

/*HC-SR04 Ping distance sensor

VCC to arduino 5v GND to arduino GND

Echo to Arduino pin 9

Trig to Arduino pin 8

Buzzer +ve to Arduino pin 13 and GND to GND

Original code sourced from

Some code and wiring inspired by


#define trigPin 8

#define echoPin 9

#define Buzzer 13

void setup()


Serial.begin (9600);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(Buzzer, OUTPUT);


void loop()


digitalWrite(trigPin, LOW);


digitalWrite(trigPin, HIGH);


digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance = (duration/2) / 29.1;

if (distance < 30)


digitalWrite(Buzzer,HIGH); //less than 30cm then buzzer will produce beep sound


else {



if (distance >= 200 || distance <= 0)


Serial.println("Out of range");


else {


Serial.println(" cm");




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