Ultrasonic Distance Sensor Project

The HC-SR04 ultrasonic sensor is perfect for measuring distances from 2cm to 400cm. This tutorial will show you how to interface it with Arduino.

Components Needed

Arduino Uno
HC-SR04 ultrasonic sensor
Jumper wires
Breadboard

How It Works

The sensor sends out ultrasonic sound waves and measures the time it takes for the echo to return. Using the speed of sound, we can calculate the distance.

Code Example

const int trigPin = 9;
const int echoPin = 10;

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);
  
  long duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2;
  
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(500);
}

Arduino Ultrasonic Distance Sensor

Ultrasonic Distance Sensor Project

Components Needed

How It Works

Code Example

Tutorial Resources

Video Tutorial

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