Overview
Story

Introduction
Hardware Required
Connections: HC-SR04 Sensor
Buzzer and LED

Published July 28, 2017 © GPL3+

Distance Alarm System

A simple device that will trigger an alarm when objects come too close to the Ultrasonic sensor.

BeginnerFull instructions provided1 hour4,678

Story

Introduction

Mabuhay!

Darwin here. In this project, I make a device that can calculate distance and set off an alarm when objects are too close to the sensor. The buzzer will buzz and a LED light will trigger to light.

Materials Needed

Hardware:

Software:

Arduino IDE

Hardware Required

Arduino UNO

Ultrasonic Sensor

Capacitor, Active Buzzer and Led Light

Breadboards

Male to Male Jumper Wires

Connections: HC-SR04 Sensor

Attach the HC-SR04 sensor to the Breadboard

1 / 2

The Sensor VCC connect to the Arduino Board +5V
The Sensor GND connect to the Arduino Board GND
The Sensor Trig connect to the Arduino Board Digital I/O 9
The Sensor Echo connect to the Arduino Board Digital I/O 10

Buzzer and LED

1 / 2 • Not Working State

The Buzzer attach to the Breadboard
The Buzzer long leg (+) connect to the Arduino Board Digital 11
The Buzzer short leg (-) connect to the Arduino Board GND
The LED attach to the Breadboard
The Resistor connect to the LED long leg (+)
The Resistor other leg (from LED's long leg) connect to the Arduino Board Digital 13
The LED short leg (-) connect to the Arduino Board GND

......................................................

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Code

Distance Alarm System

const int trigPin = 9;
const int echoPin = 10;
const int buzzer = 11;
const int ledPin = 13;
long duration;
int distance;
int safetyDistance;
void setup() {
pinMode(trigPin, OUTPUT); 
pinMode(echoPin, INPUT); 
pinMode(buzzer, OUTPUT);
pinMode(ledPin, OUTPUT);
Serial.begin(9600); 
}
void loop() {
// Clears the trigPin
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance= duration*0.034/2;
safetyDistance = distance;
if (safetyDistance <= 5){
digitalWrite(buzzer, HIGH);
digitalWrite(ledPin, HIGH);
}
else{
digitalWrite(buzzer, LOW);
digitalWrite(ledPin, LOW);
}
Serial.print("Distance: ");
Serial.println(distance);
}

Credits

Darwin Dela Cruz

6 projects • 34 followers

Mabuhay! I'm a Filipino that's enthusiastically incline in technology development.