There are so many thieves like to invade other people’s house and steal their things which is very valuable when the people are sleeping, so I create this device to solve this problem.

Laser Anti-theft Device
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Supplies

big box*1

small box*1

resistance*3

solderless breadboard*1

Arduino Leonardo*1

Piezo buzzer*1

wire*20≤

Tools to cut and paste*1≤

Laser pointer*3

Photoresistance*3

A4 size paper*1

Step 1: Connect the Components

Put all the components in their location as the image above

Step 2: Type the Code

void setup(){ // put your setup code here, to run once: Serial.begin(9600); // opens serial port, sets data rate to 9600 bps}void loop(){ // put your main code here, to run repeatedly: Serial.print(analogRead( A2 )); //print message Serial.print(" "); //print a blank Serial.println(); if ( analogRead( A2 ) < 700 ) { for (int i = 0 ; i < 10 ; ++i ) { tone(11, 1976, 200); //buzzer or speaker frequency delay( 300 ); // waits a few milliseconds tone(11, 1976, 200); //buzzer or speaker frequency delay( 600 ); // waits a few milliseconds } } Serial.print(analogRead( A3 )); //print message Serial.print(" "); //print a blank Serial.println(); if ( analogRead( A3 ) < 550 ) { for (int i = 0 ; i < 10 ; ++i ) { tone(11, 1976, 200); //buzzer or speaker frequency delay( 300 ); // waits a few milliseconds tone(11, 1976, 200); //buzzer or speaker frequency delay( 600 ); // waits a few milliseconds } } Serial.print(analogRead( A1 )); //print message Serial.print(" "); //print a blank Serial.println(); if ( analogRead( A1 ) < 800 ) { for (int i = 0 ; i < 10 ; ++i ) { tone(11, 1976, 200); //buzzer or speaker frequency delay( 300 ); // waits a few milliseconds tone(11, 1976, 200); //buzzer or speaker frequency delay( 600 ); // waits a few milliseconds } }