SurtrTech
Published © GPL3+

LASER Tripwire Alarm - Arduino

Two versions based on Grove Light Sensor, one is reset by a push button, the other one requires a passcode

EasyFull instructions provided1 hour1,032
LASER Tripwire Alarm - Arduino

Things used in this project

Hardware components

Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×1
Grove - Light Sensor
Seeed Grove - Light Sensor
×1
ky 008 Laser emitter
×1
Buzzer
Buzzer
×1
Push Button
×1
4x4 keypad matrix
×1

Hand tools and fabrication machines

10 Pc. Jumper Wire Kit, 5 cm Long
10 Pc. Jumper Wire Kit, 5 cm Long

Story

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Schematics

Wiring for V1

Wiring 2 ciadquxxdi

Wiring for V2

Wiring 3 ivdtgmuski

Code

Laser_Tripwire_Alarm_Button.ino

Arduino
This code works with the version 1
/* This code is for a LASER Tripwire Alarm based on a light sensor, LASER module and a push button
 * The LASER is constantly sending beams to the sensor, when someone passes the light is not detected
 * and the alarm goes off, and will not stop until you press the button
 * Refer to www.surtrtech.com for more details
 */
 
#define Rec 0      //Light sensor output
#define Laser 2    //Laser module 
#define Button 3   //Push button input

bool detection;

void setup() {
  pinMode(Laser, OUTPUT);
  digitalWrite(Laser, HIGH); //Turning on the laser
  delay(2000);
}

void loop() {

 short Detect = analogRead(Rec);            //Constanly reading the module value
 bool  Button_state = digitalRead(Button);  //And the button value (1-0)
 
 if(Detect < 500)              //The Max value is 760, if someone passes it goes below that (every value lower than 700 can do the work)
    detection = true;          //The detection is triggered

 if(detection==true)
    {
       tone(13,2000);        //Alarm sequence will go on as long as the detection is true
       delay(50);            //This alarm has two sounds 2kHz nd 1Khz delayed by 50ms
       tone(13,1000);
       delay(50);
    }
 
 if(Button_state == HIGH)  //If the button is pressed the buzzer is turned off and the detection too
    {
      detection = false;
      noTone(13);
    }

  
}

Laser_Tripwire_Alarm_Keypad.ino

Arduino
This code works with the version 2
/* This code is for a LASER Tripwire Alarm based on a light sensor, LASER module and keypad
 * The LASER is constantly sending beams to the sensor, when someone passes the light is not detected
 * and the alarm goes off, and will not stop until you press '*' and enter the correct code
 * Refer to www.surtrtech.com for more details
 */

#include <Keypad.h>

#define Rec 0
#define Laser 2
#define Button 3

bool detection;
short a=0;
short code[4]={'1','3','6','6'};  //pass code stored in a array you can make it longer or shorter
                                  //by changing '4' and add/remove values

const byte numRows= 4;            //Rows and columns of the keypad
const byte numCols= 4;
 
char keymap[numRows][numCols]=    //Keypad map
          {
          {'1', '2', '3', 'A'}, 
          {'4', '5', '6', 'B'}, 
          {'7', '8', '9', 'C'},
          {'*', '0', '#', 'D'}
          };

byte rowPins[numRows] = {11,10,9,8}; //Keypad 8 pins
byte colPins[numCols]= {7,6,5,4}; 

Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);

void setup() {
  
  pinMode(Laser, OUTPUT);
  digitalWrite(Laser, HIGH);
  delay(2000);
}

void loop() {

 short Detect = analogRead(Rec);                 //Constantly reading the sensor value, to detect if someone passes


    if(Detect < 500)
        detection = true;

    if(detection==true) 
        {                                       //Alarm sequence and constantly waiting for '*' to be pressed
         tone(13,1000);
         delay(50);
         tone(13,200);
         delay(50);
         char keypressed = myKeypad.getKey();
         if (keypressed == '*')                   //if '*' is pressed go to Getpass function
         Getpass();
          }
    
     if(a==4){                                   //if a==4 means the code is correct, the alarm is off
         noTone(13);
         a=0;                                   //setting the a to 0, otherwise the alarm will turn off automatically
         detection=false;
         }
 
  
}

void Getpass(){               //Getting passcode function
  tone(13,2000);              //Constant frequency sound while entring the code
  for(short i=0 ; i<4 ; i++)
            {
              
           char keypressed = myKeypad.waitForKey();
              if (keypressed==code[i])   //If the sequence is correct the a increases (4) means all values are right
              a++;
            }
}

Credits

SurtrTech

SurtrTech

1 project • 57 followers
Electronics amateur, sharing with people my few projects

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