how to make computer security using hardware at your home

Circuit:

Download Programming and Circuit:

#include <SoftwareSerial.h>

//Alarm reciever's phone number with country code

const String PHONE = "Enter_Your_Phone";

#define rxPin 2 //GSM Module TX pin to Arduino 2

#define txPin 3 //GSM Module RX pin to Arduino 3

SoftwareSerial sim800(rxPin,txPin);

//the pin that the sensor is atteched to

int sensor = 11;

void setup() {

pinMode(sensor, INPUT);

Serial.begin(115200);

sim800.begin(9600);

Serial.println("SIM800L software serial initialize");

sim800.println("AT");

delay(1000);

}

void loop(){

while(sim800.available()){

Serial.println(sim800.readString());

}

while(Serial.available()) {

sim800.println(Serial.readString());