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http://www.theorycircuit.com/interface-ultrasonic-sensor-hc-sr-04-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

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 theorycircuit.com

Some code and wiring inspired by arduino.cc

*/

#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);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

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 {

digitalWrite(Buzzer,LOW);

}

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

{

Serial.println("Out of range");

}

else {

Serial.print(distance);

Serial.println(" cm");

}

delay(500);

}

/* See more at: http://www.theorycircuit.com/DoItYourself/Electro...

*/

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