Ultrasonic sensor with Arduino - Complete Guide

Learn how to use the ultrasonic sensor (HC-SR04) with Arduino. This tutorial will teach you what it is, how to assemble the sensor on Arduino, and, at the end, you'll implement it into an alarm system project.

May 3, 2024

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GPL3+

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Devices & Components

Arduino Uno Rev3

Ultrasonic Sensor - HC-SR04

Active Buzzer 5V (HXD)

Breadboard 100x160

jumper wires for arduino

Software & Tools

Arduino IDE

Project description

Code

alarm-system-arduino.ino

cpp

Code of the Arduino alarm system project.

1const int buzzer = 8;
2const int trig_pin = 9;
3const int echo_pin = 10;
4float timing = 0.0;
5float distance = 0.0;
6
7void setup()
8{
9  pinMode(echo_pin, INPUT);
10  pinMode(trig_pin, OUTPUT);
11  pinMode(buzzer, OUTPUT);
12  
13  digitalWrite(trig_pin, LOW);
14  digitalWrite(buzzer, LOW);
15    
16  Serial.begin(9600);
17}
18
19void loop()
20{
21  digitalWrite(trig_pin, LOW);
22  delay(2);
23  
24  digitalWrite(trig_pin, HIGH);
25  delay(10);
26  digitalWrite(trig_pin, LOW);
27  
28  timing = pulseIn(echo_pin, HIGH);
29  distance = (timing * 0.034) / 2;
30  
31  Serial.print("Distance: ");
32  Serial.print(distance);
33  Serial.print("cm | ");
34  Serial.print(distance / 2.54);
35  Serial.println("in");
36  
37    
38  if (distance <= 50) {
39  	tone(buzzer, 500);
40  } else {
41  	noTone(buzzer);
42  }
43  
44  delay(100);
45}

const int buzzer = 8;
const int trig_pin = 9;
const int echo_pin = 10;
float timing = 0.0;
float distance = 0.0;

void setup()
{
  pinMode(echo_pin, INPUT);
  pinMode(trig_pin, OUTPUT);
  pinMode(buzzer, OUTPUT);
  
  digitalWrite(trig_pin, LOW);
  digitalWrite(buzzer, LOW);
    
  Serial.begin(9600);
}

void loop()
{
  digitalWrite(trig_pin, LOW);
  delay(2);
  
  digitalWrite(trig_pin, HIGH);
  delay(10);
  digitalWrite(trig_pin, LOW);
  
  timing = pulseIn(echo_pin, HIGH);
  distance = (timing * 0.034) / 2;
  
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print("cm | ");
  Serial.print(distance / 2.54);
  Serial.println("in");
  
    
  if (distance <= 50) {
  	tone(buzzer, 500);
  } else {
  	noTone(buzzer);
  }
  
  delay(100);
}

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lucasfernando

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