Objective:

         To measure the distance of the object present

Components Required

• Arduino Uno
• Ultrasound Sensor

Connection Diagram

Program

int trigPin = 2, echoPin = 3;

long duration;

int distance;

void setup()

{

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

Serial.begin(9600);

}

void loop()

{

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance= duration*0.034/2;

Serial.print(“Distance: “);

Serial.print(distance);

Serial.println(” cm”);

delay(1000);

}

Working

         The ultrasound sensor has a Transmitter and a Receiver. The transmitter transmits the ultrasound wave and the receiver used to receive the  wave reflected by the object in front of it. The time difference between the Transmitted and the Received wave is calculated and also the velocity of the sound wave is 340 m/s. So that the distance of the object can be easily calculated using the formulae

Distance = Velocity x Time

Output

Distance of the object : 100