Laser Security System at Home - Basic

Simple home security project using laser light and Arduino nano.

Jul 31, 2020

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2 respects

laser security

home security

laser security alarm

Components and supplies

Solderless Breadboard Full Size

Resistor 10k ohm

Laser Diode, 2 Pins

Arduino Nano R3

LDR, 5 Mohm

Resistor 330 ohm

Signal Relay, 5 VDC

Buzzer

LED (generic)

Project description

Code

Source Code

c_cpp

1int relayPin = 2;
2int ldrPin = A2;
3int laserPin = 5;
4int buzerPin   = 8;
5
6void setup(){
7  Serial.begin(9600);
8  pinMode(relayPin, OUTPUT);
9   pinMode(ldrPin, INPUT);
10  pinMode(laserPin, OUTPUT);
11  pinMode(buzerPin,   OUTPUT);
12  security_begin();
13}
14
15void loop() 
16{
17  digitalWrite(laserPin,   1);
18  int ldrValue = analogRead(ldrPin) / 4;
19  Serial.println(ldrValue);
20   if(ldrValue < 200)
21  {
22    security_warning();
23    setup();
24  }else{
25     digitalWrite(relayPin, 0);
26  }
27}
28
29void security_begin()
30{
31   for(int i = 0;i < 2; i++)
32    {
33      analogWrite(buzerPin, 255);
34      digitalWrite(laserPin,   1);
35      delay(50);
36      analogWrite(buzerPin, 0);
37      digitalWrite(laserPin,   0);
38      delay(50);
39    }
40}
41
42void security_warning()
43{
44    digitalWrite(relayPin,   1);
45    for(int i = 0;i < 5; i++)
46    {
47      digitalWrite(relayPin, 1);
48       digitalWrite(buzerPin, 1);
49      digitalWrite(laserPin, 1);
50      delay(500);
51       digitalWrite(relayPin, 0);
52      digitalWrite(buzerPin, 0);
53      digitalWrite(laserPin,   0);
54      delay(500);
55    }
56    digitalWrite(laserPin, 1);
57    int ldrValue   = analogRead(ldrPin) / 4;
58    if(ldrValue < 200) security_warning();
59}

int relayPin = 2;
int ldrPin = A2;
int laserPin = 5;
int buzerPin   = 8;

void setup(){
  Serial.begin(9600);
  pinMode(relayPin, OUTPUT);
   pinMode(ldrPin, INPUT);
  pinMode(laserPin, OUTPUT);
  pinMode(buzerPin,   OUTPUT);
  security_begin();
}

void loop() 
{
  digitalWrite(laserPin,   1);
  int ldrValue = analogRead(ldrPin) / 4;
  Serial.println(ldrValue);
   if(ldrValue < 200)
  {
    security_warning();
    setup();
  }else{
     digitalWrite(relayPin, 0);
  }
}

void security_begin()
{
   for(int i = 0;i < 2; i++)
    {
      analogWrite(buzerPin, 255);
      digitalWrite(laserPin,   1);
      delay(50);
      analogWrite(buzerPin, 0);
      digitalWrite(laserPin,   0);
      delay(50);
    }
}

void security_warning()
{
    digitalWrite(relayPin,   1);
    for(int i = 0;i < 5; i++)
    {
      digitalWrite(relayPin, 1);
       digitalWrite(buzerPin, 1);
      digitalWrite(laserPin, 1);
      delay(500);
       digitalWrite(relayPin, 0);
      digitalWrite(buzerPin, 0);
      digitalWrite(laserPin,   0);
      delay(500);
    }
    digitalWrite(laserPin, 1);
    int ldrValue   = analogRead(ldrPin) / 4;
    if(ldrValue < 200) security_warning();
}

Source Code

c_cpp

1int relayPin = 2;
2int ldrPin = A2;
3int laserPin = 5;
4int buzerPin  = 8;
5
6void setup(){
7  Serial.begin(9600);
8  pinMode(relayPin, OUTPUT);
9  pinMode(ldrPin, INPUT);
10  pinMode(laserPin, OUTPUT);
11  pinMode(buzerPin,  OUTPUT);
12  security_begin();
13}
14
15void loop() 
16{
17  digitalWrite(laserPin,  1);
18  int ldrValue = analogRead(ldrPin) / 4;
19  Serial.println(ldrValue);
20  if(ldrValue < 200)
21  {
22    security_warning();
23    setup();
24  }else{
25    digitalWrite(relayPin, 0);
26  }
27}
28
29void security_begin()
30{
31  for(int i = 0;i < 2; i++)
32    {
33      analogWrite(buzerPin, 255);
34      digitalWrite(laserPin,  1);
35      delay(50);
36      analogWrite(buzerPin, 0);
37      digitalWrite(laserPin,  0);
38      delay(50);
39    }
40}
41
42void security_warning()
43{
44    digitalWrite(relayPin,  1);
45    for(int i = 0;i < 5; i++)
46    {
47      digitalWrite(relayPin, 1);
48      digitalWrite(buzerPin, 1);
49      digitalWrite(laserPin, 1);
50      delay(500);
51      digitalWrite(relayPin, 0);
52      digitalWrite(buzerPin, 0);
53      digitalWrite(laserPin,  0);
54      delay(500);
55    }
56    digitalWrite(laserPin, 1);
57    int ldrValue  = analogRead(ldrPin) / 4;
58    if(ldrValue < 200) security_warning();
59}

int relayPin = 2;
int ldrPin = A2;
int laserPin = 5;
int buzerPin  = 8;

void setup(){
  Serial.begin(9600);
  pinMode(relayPin, OUTPUT);
  pinMode(ldrPin, INPUT);
  pinMode(laserPin, OUTPUT);
  pinMode(buzerPin,  OUTPUT);
  security_begin();
}

void loop() 
{
  digitalWrite(laserPin,  1);
  int ldrValue = analogRead(ldrPin) / 4;
  Serial.println(ldrValue);
  if(ldrValue < 200)
  {
    security_warning();
    setup();
  }else{
    digitalWrite(relayPin, 0);
  }
}

void security_begin()
{
  for(int i = 0;i < 2; i++)
    {
      analogWrite(buzerPin, 255);
      digitalWrite(laserPin,  1);
      delay(50);
      analogWrite(buzerPin, 0);
      digitalWrite(laserPin,  0);
      delay(50);
    }
}

void security_warning()
{
    digitalWrite(relayPin,  1);
    for(int i = 0;i < 5; i++)
    {
      digitalWrite(relayPin, 1);
      digitalWrite(buzerPin, 1);
      digitalWrite(laserPin, 1);
      delay(500);
      digitalWrite(relayPin, 0);
      digitalWrite(buzerPin, 0);
      digitalWrite(laserPin,  0);
      delay(500);
    }
    digitalWrite(laserPin, 1);
    int ldrValue  = analogRead(ldrPin) / 4;
    if(ldrValue < 200) security_warning();
}

Downloadable files

laser-security-system_schem_RaqHUIZH68.jpg

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