Interfacing Ultrasonic Sensor with Arduino

Learn how to use an HC-SR04 ultrasonic sensor to measure distance with an Arduino.

This sensor is normally used to measure the obstacle and the sensor, It normaly uses trigger and Echo.

Step 1: Gather Components

Arduino Uno
Ultrasonic Sensor (HC-SR04)
Jumper Wires
Breadboard
Arduino cable
Battery or using Laptop

Step 2: Wiring the Sensor

Connect the ultrasonic sensor to the Arduino:

VCC to Arduino 5V
GND to Arduino GND
Trig Pin to Arduino Pin 9
Echo Pin to Arduino Pin 10

Step 3: Arduino Code

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

Step 4: Upload and Monitor

Upload the code to the Arduino and open the Serial Monitor to see the measured distance.