Security System Using Ultrasonic Sensor and Gsm Module

·

VCC -> Arduino +5V pin

· GND -> Arduino GND pin

· Trig -> Arduino Digital Pin 9

· Echo -> Arduino Digital Pin 10

·

s -> Arduino pin 8

·GND -> Arduino GND pin

GND -> Arduino GND pin

TX -> Arduino Digital Pin 2

RX -> Arduino Digital Pin 3

At the first step, we are going to store the first distance as ‘Distance’ later in the loop we are going to check every time if the if the Distance is equal to the distance we got now if the distance is less than the distance we stored at the initial setup the trigger will goes on and the Buzzer will start buzzing and at the same time GSM module will send a message to the mobile number we given.

#include<SoftwareSerial.h>

#define trigPin 9

#define echoPin 10

#define piezoPin 8

SoftwareSerial mySerial(2, 3);

int normalDistance;

boolean triggered = false;

long duration, distance;

void setup()

{

mySerial.begin(9600);

Serial.begin (9600);

delay(100);

pinMode(trigPin, OUTPUT);

pinMode(echoPin, INPUT);

pinMode(piezoPin, OUTPUT);

digitalWrite(piezoPin, HIGH);

long duration, distance;

while (millis() < 5000)

{

digitalWrite(piezoPin, HIGH);

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance= duration*0.034/2;

normalDistance = distance;

Serial.print("Distance: ");

Serial.println(distance);

digitalWrite(piezoPin, LOW);

} }

void loop()

{

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

duration = pulseIn(echoPin, HIGH);

distance= duration*0.034/2;

Serial.print("Distance: ");

Serial.println(distance);

if (distance < normalDistance-5)

{

triggered = true;

}

else

{

triggered = false;

}

if (triggered)

{

tone(piezoPin, 635);

delay(500);

tone(piezoPin, 912);

delay(250);

mySerial.println("AT+CMGF=1");

//Sets the GSM Module in Text Mode

delay(1000);

// Delay of 1000 milli seconds or 1 second mySerial.println("AT+CMGS=\"+91xxxxxxxxx\"\r");

// Replace x with mobile number

delay(1000);

mySerial.println("I am SMS from GSM Module");

// The SMS text you want to send delay(100);

mySerial.println((char)26);

// ASCII code of CTRL+Z

delay(1000);

} }