Arduino security alarm system

This project will detect any intruders and alarm you using the components of an LED, a buzzer, ultrasonic sensor, and a LCD display.

Dec 29, 2021

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3 respects

home automation

security

Components and supplies

Resistor 220 ohm

Buzzer

9V battery (generic)

Arduino UNO

Rotary potentiometer (generic)

Jumper wires (generic)

RGB LCD Shield Kit, 16x2 Character Display

Ultrasonic Sensor - HC-SR04 (Generic)

Bench Power Supply, DC Power Module

5 mm LED: Red

Apps and platforms

Arduino IDE

Project description

Code

The code

c_cpp

We are using this code to detect intruders and alarm you

1#include <LiquidCrystal.h>
2LiquidCrystal LCD(A0,A1,A2,A3,A4,A5); //  the pins for the lcd display
3#define trigPin 13 
4#define echoPin 12
5//for  the ultrasonic sensor
6const int buzzer = 11;
7const int ledPin = 10;
8//the  integers for the led and buzzer
9
10void setup()
11{
12  pinMode(trigPin, OUTPUT);
13  pinMode(echoPin, INPUT); 
14  pinMode(buzzer, OUTPUT);
15  pinMode(ledPin, OUTPUT);
16  LCD.begin(16,2); // contacting the lcd display
17  }
18
19void loop(){
20
21  
22 long duration, distance;
23 digitalWrite(trigPin, LOW);
24 delayMicroseconds(2);
25  digitalWrite(trigPin, HIGH);
26 delayMicroseconds(10);
27 digitalWrite(trigPin,  LOW);
28 duration = pulseIn(echoPin, HIGH);
29 distance = (duration/2) / 29.1;
30  delay(500);
31
32 LCD.setCursor(0,1);
33 LCD.print("                ");
34  LCD.setCursor(0,1);
35 LCD.print(distance);
36 LCD.print(" cm");
37 //to print  the distance the ultrasonic sensor is detecting when it finds an object
38
39  if (distance <= 40) {
40  LCD.setCursor(0,0);
41  LCD.print("Intruder       ");
42  digitalWrite(buzzer, HIGH);
43  digitalWrite(ledPin, HIGH);
44  //saying if  the device detects an object in a distance lower than 40 cm it will alarm you that  there is an inrtuder. The lcd display will say intruder.
45  }
46    else 
47  {
48    LCD.setCursor(0,0);
49    LCD.print("             ");
50    digitalWrite(buzzer,  LOW);
51    digitalWrite(ledPin, LOW); 
52    // and if there is no object in  a distance lower than 40 cm it will say to keep the buzzer and led blank. There  will also be no words printed on the lcd display
53  }

#include <LiquidCrystal.h>
LiquidCrystal LCD(A0,A1,A2,A3,A4,A5); //  the pins for the lcd display
#define trigPin 13 
#define echoPin 12
//for  the ultrasonic sensor
const int buzzer = 11;
const int ledPin = 10;
//the  integers for the led and buzzer

void setup()
{
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT); 
  pinMode(buzzer, OUTPUT);
  pinMode(ledPin, OUTPUT);
  LCD.begin(16,2); // contacting the lcd display
  }

void loop(){

  
 long duration, distance;
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigPin,  LOW);
 duration = pulseIn(echoPin, HIGH);
 distance = (duration/2) / 29.1;
  delay(500);

 LCD.setCursor(0,1);
 LCD.print("                ");
  LCD.setCursor(0,1);
 LCD.print(distance);
 LCD.print(" cm");
 //to print  the distance the ultrasonic sensor is detecting when it finds an object

  if (distance <= 40) {
  LCD.setCursor(0,0);
  LCD.print("Intruder       ");
  digitalWrite(buzzer, HIGH);
  digitalWrite(ledPin, HIGH);
  //saying if  the device detects an object in a distance lower than 40 cm it will alarm you that  there is an inrtuder. The lcd display will say intruder.
  }
    else 
  {
    LCD.setCursor(0,0);
    LCD.print("             ");
    digitalWrite(buzzer,  LOW);
    digitalWrite(ledPin, LOW); 
    // and if there is no object in  a distance lower than 40 cm it will say to keep the buzzer and led blank. There  will also be no words printed on the lcd display
  }

The code

c_cpp

We are using this code to detect intruders and alarm you

1#include <LiquidCrystal.h>
2LiquidCrystal LCD(A0,A1,A2,A3,A4,A5); //   the pins for the lcd display
3#define trigPin 13 
4#define echoPin 12
5//for   the ultrasonic sensor
6const int buzzer = 11;
7const int ledPin = 10;
8//the   integers for the led and buzzer
9
10void setup()
11{
12  pinMode(trigPin, OUTPUT);
13   pinMode(echoPin, INPUT); 
14  pinMode(buzzer, OUTPUT);
15  pinMode(ledPin, OUTPUT);
16   LCD.begin(16,2); // contacting the lcd display
17  }
18
19void loop(){
20
21   
22 long duration, distance;
23 digitalWrite(trigPin, LOW);
24 delayMicroseconds(2);
25   digitalWrite(trigPin, HIGH);
26 delayMicroseconds(10);
27 digitalWrite(trigPin,   LOW);
28 duration = pulseIn(echoPin, HIGH);
29 distance = (duration/2) / 29.1;
30   delay(500);
31
32 LCD.setCursor(0,1);
33 LCD.print("                ");
34   LCD.setCursor(0,1);
35 LCD.print(distance);
36 LCD.print(" cm");
37 //to print   the distance the ultrasonic sensor is detecting when it finds an object
38
39   if (distance <= 40) {
40  LCD.setCursor(0,0);
41  LCD.print("Intruder       ");
42   digitalWrite(buzzer, HIGH);
43  digitalWrite(ledPin, HIGH);
44  //saying if   the device detects an object in a distance lower than 40 cm it will alarm you that   there is an inrtuder. The lcd display will say intruder.
45  }
46    else 
47   {
48    LCD.setCursor(0,0);
49    LCD.print("             ");
50    digitalWrite(buzzer,   LOW);
51    digitalWrite(ledPin, LOW); 
52    // and if there is no object in   a distance lower than 40 cm it will say to keep the buzzer and led blank. There   will also be no words printed on the lcd display
53  }

#include <LiquidCrystal.h>
LiquidCrystal LCD(A0,A1,A2,A3,A4,A5); //   the pins for the lcd display
#define trigPin 13 
#define echoPin 12
//for   the ultrasonic sensor
const int buzzer = 11;
const int ledPin = 10;
//the   integers for the led and buzzer

void setup()
{
  pinMode(trigPin, OUTPUT);
   pinMode(echoPin, INPUT); 
  pinMode(buzzer, OUTPUT);
  pinMode(ledPin, OUTPUT);
   LCD.begin(16,2); // contacting the lcd display
  }

void loop(){

   
 long duration, distance;
 digitalWrite(trigPin, LOW);
 delayMicroseconds(2);
   digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);
 digitalWrite(trigPin,   LOW);
 duration = pulseIn(echoPin, HIGH);
 distance = (duration/2) / 29.1;
   delay(500);

 LCD.setCursor(0,1);
 LCD.print("                ");
   LCD.setCursor(0,1);
 LCD.print(distance);
 LCD.print(" cm");
 //to print   the distance the ultrasonic sensor is detecting when it finds an object

   if (distance <= 40) {
  LCD.setCursor(0,0);
  LCD.print("Intruder       ");
   digitalWrite(buzzer, HIGH);
  digitalWrite(ledPin, HIGH);
  //saying if   the device detects an object in a distance lower than 40 cm it will alarm you that   there is an inrtuder. The lcd display will say intruder.
  }
    else 
   {
    LCD.setCursor(0,0);
    LCD.print("             ");
    digitalWrite(buzzer,   LOW);
    digitalWrite(ledPin, LOW); 
    // and if there is no object in   a distance lower than 40 cm it will say to keep the buzzer and led blank. There   will also be no words printed on the lcd display
  }

Downloadable files

Circuit diagram

screenshot_(5)_EET0j3sVwd.png

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