Smart Car

//==============================================
// led constants from pin 10 to 12 
//==============================================
const int ledPin1 = 10;     // parking mode 
const int ledPin2 = 11;     // find my car mode
const int ledPin3 = 12;     // theif alarm mode 

// variables will change:
int ledState1 = LOW;         // variable for reading the led 1 status
int ledState2 = LOW;         // variable for reading the led 2 status
int ledState3 = LOW;         // variable for reading the led 3 status

//==============================================
// pir sensor constants 
//============================================== 
int inputPin = 9 ; // choose the input pin (for PIR sensor) 
int pirState = LOW ; // we start, assuming no motion detected 
int pirval = 0; // variable for reading the pin status 

//==============================================
// police buzzer constants 
//============================================== 
const int freq = 500;
const int dur = 10;
const int buzzer = 3;

//==============================================
// GPS constants 
//============================================== 
#include "TinyGPS++.h" 
#include "SoftwareSerial.h" 
SoftwareSerial serial_connection(5, 4); //RX=pin 5, TX=pin 4 
TinyGPSPlus gps;//This is the GPS object that will pretty much do all the grunt work with the NMEA data 
long Latitude ,  Longitude ;

//==============================================
// Ultrasonic Sensor constants 
//============================================== 
#define echoPin 7 // Echo Pin  
#define trigPin 8 // Trigger Pin  
long duration, distance ; // Duration used to calculate distance 

//==============================================
// Declaring values to be printed 
//============================================== 
int mode = 0 ;
int gpsState = false ;

void setup() 
{
  
  // initialize the led pin as an input
  
  pinMode(ledPin1, INPUT);
  pinMode(ledPin2, INPUT);
  pinMode(ledPin3, INPUT);
  
  // declare sensor as input
  
  pinMode(inputPin, INPUT);  
  Serial.begin(9600); 

  // declare buzzer pin as output
  
  pinMode(buzzer, OUTPUT);

  // GPS declaration 
  serial_connection.begin(9600);//This opens up communications to the GPS
  Serial.println("GPS Start");//Just show to the monitor that the sketch has started 

  //Ultrasonic declaration
  pinMode(trigPin, OUTPUT);  
  pinMode(echoPin, INPUT);  

}

void loop() {
  // read the state of the pushbutton value:
    ledState1 = digitalRead(ledPin1);
    ledState2 = digitalRead(ledPin2);
    ledState3 = digitalRead(ledPin3);

  //read the GPS values
    while(serial_connection.available())//While there are characters to come from the GPS 
    { 
    gps.encode(serial_connection.read());//This feeds the serial NMEA data into the library one char at a time 
    } 
    if(gps.location.isUpdated())//This will pretty much be fired all the time anyway but will at least reduce it to only after a package of NMEA data comes in 
    { 
   //Get the latest info from the gps object which it derived from the data sent by the GPS unit 
    Latitude =  gps.location.lat() ;
    Longitude =  gps.location.lng();  
    }

  
  // check the mode that is chosen .

  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  // device off MODE 
  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 
   if (ledState1 == LOW && ledState2 == LOW && ledState3 == LOW) 
    {
     mode = 0 ;
     gpsState = true ;
    
 // print mode , pirState , gpsState , longtude , latitude
    Serial.print(String(mode)); //mode number
    Serial.print(",");
    Serial.print(String(pirState)); //print if there is somebody in the car or not 
    Serial.print(","); 
    Serial.print(String(gpsState));// gpsState
    Serial.print(",");
    Serial.print(String(Longitude));// Longitude
    Serial.print(",");
    Serial.println(String(Latitude));// Latitude
  }

  
  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  // PARKING MODE 
  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  // if led 1 is HIGH then parking mode is active .
  else if (ledState1 == HIGH && ledState2 == LOW && ledState3 == LOW) 
  {
   mode = 1 ;
   gpsState = false ;
   
   /* The following trigPin/echoPin cycle is used to determine the
 distance of the nearest object by bouncing soundwaves off of it. */ 
 
 digitalWrite(trigPin, LOW); 
 delayMicroseconds(2); 
 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10);  
 digitalWrite(trigPin, LOW);
 duration = pulseIn(echoPin, HIGH);
 
 //Calculate the distance (in cm) based on the speed of sound.
 distance = duration/58.2;

 int no =2;
 if(distance < 7){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 15){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 20){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 25){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 30){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 35){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 40){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 45){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 50){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } else if (distance < 55){
   tone(buzzer, freq, dur);
   delay(distance*no);
 } 
 
Serial.print(String(distance)); //mode number
    
 //Delay 50ms before next reading.
 delay(500);

 // values to be printed on the cloud in mode 1
 // print mode , pirState , gpsState , Longitude , Latitude
    Serial.print(String(1)); //mode number
    Serial.print(",");
    Serial.print(String(0)); //print if there is somebody in the car or not 
    Serial.print(",");
    Serial.print(String(gpsState));// GPS State
    Serial.print(",");
    Serial.print(String(Longitude));// Longitude
    Serial.print(",");
    Serial.println(String(Latitude));// Latitude
     }   
    
  
  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  // FIND MY CAR MODE 
  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  // if led 2 is HIGH then gps tracking (find my car) mode is active .
  else if (ledState1 == LOW && ledState2 == HIGH && ledState3 == LOW) 
  {
    
   mode = 2 ;
   gpsState = true ;
   
    // turn on alarm  
   tone(buzzer, freq, 1500);
   delay(1000);
   tone(buzzer, freq, 500);
   delay(500);

 // values to be printed on the cloud in mode 1
 // print mode , pirState , gpsState , longitude , Latitude
    Serial.print(String(mode)); //mode number
    Serial.print(",");
    Serial.print(String(pirState)); //print if there is somebody in the car or not 
    Serial.print(","); 
    Serial.print(String(gpsState));// GPS State
    Serial.print(",");
    Serial.print(String(Longitude));// Longitude
    Serial.print(",");
    Serial.println(String(Latitude));// Latitude
      }

  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  // THIEF ALARM MODE 
  //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  
  // if led 3 is HIGH then alarm mode is active .
  else if (ledState1 == LOW && ledState2 == LOW && ledState3 == HIGH) 
  {
   mode = 3 ;
   gpsState = true ;
   
   //check the PIR sensor state to make alarm & report car location if anybody entered the car 
   pirval = digitalRead(inputPin); // read input value 
   if (pirval == HIGH ) { 
    
   // turn on alarm  
   tone(buzzer, freq, 1000);
   delay(100);
   tone(buzzer, freq, 500);
   delay(500);
 
    } 
     
    else { 
    } 


 // print mode , pirState , gpsState , longtude , Latitude
    Serial.print(String(3)); //mode number
    Serial.print(",");
    Serial.print(String(pirval)); //print if there is somebody in the car or not 
    Serial.print(","); 
    Serial.print(String(gpsState));// gpsState
    Serial.print(",");
    Serial.print(String(Longitude));// Longitude
    Serial.print(",");
    Serial.println(String(Latitude));// Latitude
  
  }

 
}