Arduino-Based Security Alarm

This security alarm is an easy-to-use, efficient product that can function anytime, and anywhere.

Aug 14, 2019

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data collection

robots

Devices & Components

5 mm LED: Green

Buzzer, Piezo

Rotary Potentiometer, 10 kohm

Alphanumeric LCD, 16 x 2

5 mm LED: Red

Ultrasonic Sensor - HC-SR04 (Generic)

Hardware & Tools

Premium Female/Male Extension Jumper Wires, 40 x 6" (150mm)

Servo Motor, Premium Male/Male Jumper Wires

Project description

Code

Arduino Security Alarm Code

c_cpp

Using this code, using various commands, I was able to code each sensor so that if the distance is 40 centimeters or lower, then the buzzer will sound along with the appearance of a red LED light. However, if the distance is greater than 40 centimeters, then the buzzer will not sound and then a green LED will show. I also displayed the distance on an LCD screen (also connected to the Arduino) to give the owner an insight of how far away the person is using this code.

1// The LiquidCrystal library works with LCD displays that are compatible.  For this project, I will be using a 16X2 LCD display.
2#include <LiquidCrystal.h>  
3// Initialize the library with the numbers of the pins connected to the LCD  Screen.
4LiquidCrystal lcd (12, 11, 5, 4, 3, 2); 
5
6// Declaring the integers  needed for this project
7// Setting trigPin (Ultrasonic Sensor) to Pin 9
8const  int trigPin = 9;
9// Setting echoPin (Ultrasonic Sensor) to Pin 10
10const int  echoPin = 10;
11// Declaring duration for the distance formula later on
12long  duration;
13// Declaring the distance in centimeters as well as the distance in  inches
14int distanceCm, distanceInch;
15// Setting buzzerPin (buzzer) to Pin  6
16const int buzzerPin = 6;
17// Setting greenPin (LED) to pin 13
18int greenPin  = 13;
19// Setting redPin (LED) to pin 7
20int redPin = 7;
21
22
23// Runs  once
24void setup() {
25
26// Configuring buzzerPin as an OUTPUT value
27  pinMode  (buzzerPin, OUTPUT);
28
29// Set up the LCD's number of columns and rows  
30lcd.begin  (16,2); 
31// Configuring trigPin as OUTPUT because the trigPin is sending out  the sound signal to the object detected.
32pinMode (trigPin, OUTPUT);
33// Configuring  echoPin as INPUT because the echoPin is recieving the signal from the object detected.
34pinMode  (echoPin, INPUT);
35
36// Configuring the greenPin as OUTPUT.
37pinMode (greenPin,  OUTPUT);
38// Configuring the redPin as OUTPUT.
39pinMode (redPin, OUTPUT);
40}
41
42//  Runs multiple times until the statement becomes false
43void loop() {
44  // Sets  the trigPin on a LOW state, as well as clearing the trigPin.
45digitalWrite (trigPin,  LOW);
46// This will last for 2 microseconds.
47delayMicroseconds(2);
48// The  trigPin will be on a HIGH state
49digitalWrite (trigPin, HIGH);
50// This will  last for 10 microseconds for the Ultrasonic Sensor to sense the object.
51delayMicroseconds(10);
52//  Then, after 10 microseconds, the trigPin will be set on a LOW state once more.
53digitalWrite  (trigPin, LOW);
54// The echoPin will be set on a HIGH state to receive the signal  and therefore be able to display the distance. 
55duration = pulseIn (echoPin,  HIGH);
56// Formula for calculating the distance in Centimeters.
57distanceCm  = duration*0.034/2;
58// Formula for calculating the distance in inches.
59distanceInch  = duration*0.0133/2;
60// Sets the LCD cursor to (0, 0), which is the top left  of the LCD Screen
61lcd.setCursor (0,0); 
62// The LCD screen will display "Distance:  "
63lcd.print ("Distance: ");
64// The LCD screen will display the distance,  in centimeters, which is being detected by the Ultrasonic Sensor.
65lcd.print (distanceCm);  
66// The LCD screen will display " cm"
67lcd.print (" cm");
68// There is  a delay of 0.01 seconds for the LCD screen to display the reading.
69delay (10);
70//  The LCD cursor will move on to the next column.
71lcd.setCursor (0,1);
72// The  LCD screen will display "Distance: "
73lcd.print ("Distance: ");
74// The  LCD screen will display the distance, in inches, which is being detected by the  Ultrasonic Sensor, as well. 
75lcd.print (distanceInch);
76// The LCD screen will  display " inch"
77lcd.print (" inch");
78// There is a delay of 0.01 seconds  once more for the LCD screen to display the reading. 
79delay (10);
80
81// This  is an if-else statement. If the distance (in centimeters) is less than 40, then  the red LED will turn on, the green LED will turn off, and the buzzer will sound.
82  if (distanceCm<=40){
83  digitalWrite (7, HIGH);
84  digitalWrite (13, LOW);
85  analogWrite (6, 255);
86  delay (0);
87  }
88  else{
89    // Otherwise, if  the distance is greater than 40 centimeters (if the above statement is false), then  the green LED will turn on, the red LED will turn off, and the buzzer will not sound.
90    digitalWrite (13, HIGH);
91    digitalWrite (7, LOW);
92    analogWrite (6,  0);
93    delay (0);
94  }
95}
96  
97      
98   
99  
100    
101  
102    
103

// The LiquidCrystal library works with LCD displays that are compatible.  For this project, I will be using a 16X2 LCD display.
#include <LiquidCrystal.h>  
// Initialize the library with the numbers of the pins connected to the LCD  Screen.
LiquidCrystal lcd (12, 11, 5, 4, 3, 2); 

// Declaring the integers  needed for this project
// Setting trigPin (Ultrasonic Sensor) to Pin 9
const  int trigPin = 9;
// Setting echoPin (Ultrasonic Sensor) to Pin 10
const int  echoPin = 10;
// Declaring duration for the distance formula later on
long  duration;
// Declaring the distance in centimeters as well as the distance in  inches
int distanceCm, distanceInch;
// Setting buzzerPin (buzzer) to Pin  6
const int buzzerPin = 6;
// Setting greenPin (LED) to pin 13
int greenPin  = 13;
// Setting redPin (LED) to pin 7
int redPin = 7;


// Runs  once
void setup() {

// Configuring buzzerPin as an OUTPUT value
  pinMode  (buzzerPin, OUTPUT);

// Set up the LCD's number of columns and rows  
lcd.begin  (16,2); 
// Configuring trigPin as OUTPUT because the trigPin is sending out  the sound signal to the object detected.
pinMode (trigPin, OUTPUT);
// Configuring  echoPin as INPUT because the echoPin is recieving the signal from the object detected.
pinMode  (echoPin, INPUT);

// Configuring the greenPin as OUTPUT.
pinMode (greenPin,  OUTPUT);
// Configuring the redPin as OUTPUT.
pinMode (redPin, OUTPUT);
}

//  Runs multiple times until the statement becomes false
void loop() {
  // Sets  the trigPin on a LOW state, as well as clearing the trigPin.
digitalWrite (trigPin,  LOW);
// This will last for 2 microseconds.
delayMicroseconds(2);
// The  trigPin will be on a HIGH state
digitalWrite (trigPin, HIGH);
// This will  last for 10 microseconds for the Ultrasonic Sensor to sense the object.
delayMicroseconds(10);
//  Then, after 10 microseconds, the trigPin will be set on a LOW state once more.
digitalWrite  (trigPin, LOW);
// The echoPin will be set on a HIGH state to receive the signal  and therefore be able to display the distance. 
duration = pulseIn (echoPin,  HIGH);
// Formula for calculating the distance in Centimeters.
distanceCm  = duration*0.034/2;
// Formula for calculating the distance in inches.
distanceInch  = duration*0.0133/2;
// Sets the LCD cursor to (0, 0), which is the top left  of the LCD Screen
lcd.setCursor (0,0); 
// The LCD screen will display "Distance:  "
lcd.print ("Distance: ");
// The LCD screen will display the distance,  in centimeters, which is being detected by the Ultrasonic Sensor.
lcd.print (distanceCm);  
// The LCD screen will display " cm"
lcd.print (" cm");
// There is  a delay of 0.01 seconds for the LCD screen to display the reading.
delay (10);
//  The LCD cursor will move on to the next column.
lcd.setCursor (0,1);
// The  LCD screen will display "Distance: "
lcd.print ("Distance: ");
// The  LCD screen will display the distance, in inches, which is being detected by the  Ultrasonic Sensor, as well. 
lcd.print (distanceInch);
// The LCD screen will  display " inch"
lcd.print (" inch");
// There is a delay of 0.01 seconds  once more for the LCD screen to display the reading. 
delay (10);

// This  is an if-else statement. If the distance (in centimeters) is less than 40, then  the red LED will turn on, the green LED will turn off, and the buzzer will sound.
  if (distanceCm<=40){
  digitalWrite (7, HIGH);
  digitalWrite (13, LOW);
  analogWrite (6, 255);
  delay (0);
  }
  else{
    // Otherwise, if  the distance is greater than 40 centimeters (if the above statement is false), then  the green LED will turn on, the red LED will turn off, and the buzzer will not sound.
    digitalWrite (13, HIGH);
    digitalWrite (7, LOW);
    analogWrite (6,  0);
    delay (0);
  }
}

Arduino Security Alarm Code

c_cpp

1// The LiquidCrystal library works with LCD displays that are compatible.
2  For this project, I will be using a 16X2 LCD display.
3#include <LiquidCrystal.h>
4  
5// Initialize the library with the numbers of the pins connected to the LCD
6  Screen.
7LiquidCrystal lcd (12, 11, 5, 4, 3, 2); 
8
9// Declaring the integers
10  needed for this project
11// Setting trigPin (Ultrasonic Sensor) to Pin 9
12const
13  int trigPin = 9;
14// Setting echoPin (Ultrasonic Sensor) to Pin 10
15const int
16  echoPin = 10;
17// Declaring duration for the distance formula later on
18long
19  duration;
20// Declaring the distance in centimeters as well as the distance in
21  inches
22int distanceCm, distanceInch;
23// Setting buzzerPin (buzzer) to Pin
24  6
25const int buzzerPin = 6;
26// Setting greenPin (LED) to pin 13
27int greenPin
28  = 13;
29// Setting redPin (LED) to pin 7
30int redPin = 7;
31
32
33// Runs
34  once
35void setup() {
36
37// Configuring buzzerPin as an OUTPUT value
38  pinMode
39  (buzzerPin, OUTPUT);
40
41// Set up the LCD's number of columns and rows  
42lcd.begin
43  (16,2); 
44// Configuring trigPin as OUTPUT because the trigPin is sending out
45  the sound signal to the object detected.
46pinMode (trigPin, OUTPUT);
47// Configuring
48  echoPin as INPUT because the echoPin is recieving the signal from the object detected.
49pinMode
50  (echoPin, INPUT);
51
52// Configuring the greenPin as OUTPUT.
53pinMode (greenPin,
54  OUTPUT);
55// Configuring the redPin as OUTPUT.
56pinMode (redPin, OUTPUT);
57}
58
59//
60  Runs multiple times until the statement becomes false
61void loop() {
62  // Sets
63  the trigPin on a LOW state, as well as clearing the trigPin.
64digitalWrite (trigPin,
65  LOW);
66// This will last for 2 microseconds.
67delayMicroseconds(2);
68// The
69  trigPin will be on a HIGH state
70digitalWrite (trigPin, HIGH);
71// This will
72  last for 10 microseconds for the Ultrasonic Sensor to sense the object.
73delayMicroseconds(10);
74//
75  Then, after 10 microseconds, the trigPin will be set on a LOW state once more.
76digitalWrite
77  (trigPin, LOW);
78// The echoPin will be set on a HIGH state to receive the signal
79  and therefore be able to display the distance. 
80duration = pulseIn (echoPin,
81  HIGH);
82// Formula for calculating the distance in Centimeters.
83distanceCm
84  = duration*0.034/2;
85// Formula for calculating the distance in inches.
86distanceInch
87  = duration*0.0133/2;
88// Sets the LCD cursor to (0, 0), which is the top left
89  of the LCD Screen
90lcd.setCursor (0,0); 
91// The LCD screen will display "Distance:
92  "
93lcd.print ("Distance: ");
94// The LCD screen will display the distance,
95  in centimeters, which is being detected by the Ultrasonic Sensor.
96lcd.print (distanceCm);
97  
98// The LCD screen will display " cm"
99lcd.print (" cm");
100// There is
101  a delay of 0.01 seconds for the LCD screen to display the reading.
102delay (10);
103//
104  The LCD cursor will move on to the next column.
105lcd.setCursor (0,1);
106// The
107  LCD screen will display "Distance: "
108lcd.print ("Distance: ");
109// The
110  LCD screen will display the distance, in inches, which is being detected by the
111  Ultrasonic Sensor, as well. 
112lcd.print (distanceInch);
113// The LCD screen will
114  display " inch"
115lcd.print (" inch");
116// There is a delay of 0.01 seconds
117  once more for the LCD screen to display the reading. 
118delay (10);
119
120// This
121  is an if-else statement. If the distance (in centimeters) is less than 40, then
122  the red LED will turn on, the green LED will turn off, and the buzzer will sound.
123
124  if (distanceCm<=40){
125  digitalWrite (7, HIGH);
126  digitalWrite (13, LOW);
127
128  analogWrite (6, 255);
129  delay (0);
130  }
131  else{
132    // Otherwise, if
133  the distance is greater than 40 centimeters (if the above statement is false), then
134  the green LED will turn on, the red LED will turn off, and the buzzer will not sound.
135
136    digitalWrite (13, HIGH);
137    digitalWrite (7, LOW);
138    analogWrite (6,
139  0);
140    delay (0);
141  }
142}
143  
144      
145   
146  
147    
148  
149
150    
151

// The LiquidCrystal library works with LCD displays that are compatible.
  For this project, I will be using a 16X2 LCD display.
#include <LiquidCrystal.h>
  
// Initialize the library with the numbers of the pins connected to the LCD
  Screen.
LiquidCrystal lcd (12, 11, 5, 4, 3, 2); 

// Declaring the integers
  needed for this project
// Setting trigPin (Ultrasonic Sensor) to Pin 9
const
  int trigPin = 9;
// Setting echoPin (Ultrasonic Sensor) to Pin 10
const int
  echoPin = 10;
// Declaring duration for the distance formula later on
long
  duration;
// Declaring the distance in centimeters as well as the distance in
  inches
int distanceCm, distanceInch;
// Setting buzzerPin (buzzer) to Pin
  6
const int buzzerPin = 6;
// Setting greenPin (LED) to pin 13
int greenPin
  = 13;
// Setting redPin (LED) to pin 7
int redPin = 7;


// Runs
  once
void setup() {

// Configuring buzzerPin as an OUTPUT value
  pinMode
  (buzzerPin, OUTPUT);

// Set up the LCD's number of columns and rows  
lcd.begin
  (16,2); 
// Configuring trigPin as OUTPUT because the trigPin is sending out
  the sound signal to the object detected.
pinMode (trigPin, OUTPUT);
// Configuring
  echoPin as INPUT because the echoPin is recieving the signal from the object detected.
pinMode
  (echoPin, INPUT);

// Configuring the greenPin as OUTPUT.
pinMode (greenPin,
  OUTPUT);
// Configuring the redPin as OUTPUT.
pinMode (redPin, OUTPUT);
}

//
  Runs multiple times until the statement becomes false
void loop() {
  // Sets
  the trigPin on a LOW state, as well as clearing the trigPin.
digitalWrite (trigPin,
  LOW);
// This will last for 2 microseconds.
delayMicroseconds(2);
// The
  trigPin will be on a HIGH state
digitalWrite (trigPin, HIGH);
// This will
  last for 10 microseconds for the Ultrasonic Sensor to sense the object.
delayMicroseconds(10);
//
  Then, after 10 microseconds, the trigPin will be set on a LOW state once more.
digitalWrite
  (trigPin, LOW);
// The echoPin will be set on a HIGH state to receive the signal
  and therefore be able to display the distance. 
duration = pulseIn (echoPin,
  HIGH);
// Formula for calculating the distance in Centimeters.
distanceCm
  = duration*0.034/2;
// Formula for calculating the distance in inches.
distanceInch
  = duration*0.0133/2;
// Sets the LCD cursor to (0, 0), which is the top left
  of the LCD Screen
lcd.setCursor (0,0); 
// The LCD screen will display "Distance:
  "
lcd.print ("Distance: ");
// The LCD screen will display the distance,
  in centimeters, which is being detected by the Ultrasonic Sensor.
lcd.print (distanceCm);
  
// The LCD screen will display " cm"
lcd.print (" cm");
// There is
  a delay of 0.01 seconds for the LCD screen to display the reading.
delay (10);
//
  The LCD cursor will move on to the next column.
lcd.setCursor (0,1);
// The
  LCD screen will display "Distance: "
lcd.print ("Distance: ");
// The
  LCD screen will display the distance, in inches, which is being detected by the
  Ultrasonic Sensor, as well. 
lcd.print (distanceInch);
// The LCD screen will
  display " inch"
lcd.print (" inch");
// There is a delay of 0.01 seconds
  once more for the LCD screen to display the reading. 
delay (10);

// This
  is an if-else statement. If the distance (in centimeters) is less than 40, then
  the red LED will turn on, the green LED will turn off, and the buzzer will sound.

  if (distanceCm<=40){
  digitalWrite (7, HIGH);
  digitalWrite (13, LOW);

  analogWrite (6, 255);
  delay (0);
  }
  else{
    // Otherwise, if
  the distance is greater than 40 centimeters (if the above statement is false), then
  the green LED will turn on, the red LED will turn off, and the buzzer will not sound.

    digitalWrite (13, HIGH);
    digitalWrite (7, LOW);
    analogWrite (6,
  0);
    delay (0);
  }
}

Downloadable files

Arduino Security Alarm Schematic

This is my Arduino Security Alarm Schematic. Using a website called Tinkercad.com, I was able to create a schematic of my project, which is a Security Alarm made from an Arduino Board.

Arduino Security Alarm Schematic

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