Burglar Alarm using Arduino and PIR Sensor with SMS Alarm using GSM Module.

Burglar Alarm using Arduino and PIR Sensor with SMS Alarm using GSM Module

We have built a simple arduino anti theft alarm, why not build an advanced version of the same burglar detector? What if we can build a burglar alarm that texts you an sms when an intruder is detected ? cool idea – isn’t it? So lets get our hands at it – a burglar alarm that sends text message (sms) using arduino and pir sensor.


We are going to use a gsm module in addition to components and modules used in above circuit. You need to have an idea of how to interface a gsm module and arduino together before you begin this project. Assemble the circuit as shown in the gsm burglar alarm circuit.




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Connections Explained!


Refer previous circuit diagram and its explanation first. The only addition module used is GSM Module.






GSM Module – Connect its Tx pin to Pin 9 of Arduino | Connect Rx to Pin 10 – Arduino | Vcc or Power Jack to +12 Volt | Make GND or Ground pin common to all other components and modules


Objectives of the PIR Sensor Alarm using Arduino


Detect a motion – an intruder or a burglar using PIR sensor
Activate the buzzer alarm upon detection of burglar/intruder – Alarm should sound until Reset switch is pressed
Send 3 SMS to a predefined mobile number set inside the program.
Stop the alarm when reset switch is pressed. Also reactivate the SMS alert facility upon reset.

#include<SoftwareSerial.h>
SoftwareSerial mySerial(9, 10);
int sensor=7; //The output of PIR sensor connected to pin 7
int push_switch=6; // push button switch connected to pin 6
int buzzer=8; // buzzer connected at pin 8
int sensor_value; //variable to hold read sensor value
int sms_count=0;
void setup()
{
pinMode(sensor,INPUT); // configuring pin 7 as Input
pinMode(push_switch,INPUT); // configuring pin 6 as Input
pinMode(buzzer,OUTPUT); // configuring pin 8 as OUTPUT
mySerial.begin(9600);
}

void loop()
{
Check_Burglar();// subroutine to check sensor status and activation of outputs
Check_Reset(); // subroutine to check if alarm reset switch pressed or not
}

void Check_Burglar()
{
sensor_value=digitalRead(sensor); // Reading sensor value from pin 7
if(sensor_value==HIGH) // Checking if PIR sensor sends a HIGH signal to Arduino
{
  digitalWrite(buzzer,HIGH); // Activating the buzzer 
  while(sms_count<3) //Number of SMS Alerts to be sent limited at 3
    {  
      SendTextMessage(); // Function to send AT Commands to GSM module
    }
}}

void Check_Reset()
{
if(digitalRead(push_switch==HIGH))// Checking if pushbutton was pressed 
{
digitalWrite(buzzer,LOW); // turning OFF the buzzer 
sms_count=0; // Reactivating the SMS Alert Facility
}}

void SendTextMessage()
{
  mySerial.println("AT+CMGF=1");    //To send SMS in Text Mode
  delay(1000);
  mySerial.println("AT+CMGS="+919495xxxxxx"r"); // change to the phone number you using 
  delay(1000);
  mySerial.println("Gas Leaking!");//the content of the message
  delay(200);
  mySerial.println((char)26);//the stopping character
  delay(1000);
  sms_count++;
}

So how simple was that advanced Arduino intrusion alarm using GSM module ? The program is self explanatory! If you have any doubts, please ask in comments section.