#include <TinyGPS.h>
#include <SoftwareSerial.h>
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
SoftwareSerial Gsm(7, 8);
char phone_no[] = "+91XXXXXXXXXX"; //replace with phone no. to get sms

TinyGPS gps;  //Creates a new instance of the TinyGPS object
int state; 
String textMessage; 
const int sensor=A1;
const int ldrPin = A0;// Assigning analog pin A5 to variable 'sensor'

float tempc; //variable to store temperature in degree Celsius
float vout; //temporary variable to hold sensor reading
void setup()
{
  Serial.begin(9600);
  Gsm.begin(9600); 
   delay(2000);

  // AT command to set SIM900 to SMS mode
  Serial.print("AT+CMGF=1\r"); 
  delay(100);
   // Set module to send SMS data to serial out upon receipt 
  Serial.print("AT+CNMI=2,2,0,0,0\r");
  delay(100); 
 pinMode(6,INPUT);
 pinMode(sensor,INPUT);
 pinMode(ldrPin, INPUT);
 lcd.begin();
  lcd.backlight();
  lcd.clear();
  lcd.print("Searching ");
  lcd.setCursor(0,1);
  lcd.print("Network....... "); 
  delay(3000);
}
 
void loop()
{
   lcd.clear();
     lcd.print("Soldier Tracking");
     lcd.setCursor(0,1);
     lcd.print("System...!!"); 
     delay(100);
 
  
  bool newData = false;
  unsigned long chars;
  unsigned short sentences, failed;
 
  // For one second we parse GPS data and report some key values
  for (unsigned long start = millis(); millis() - start < 1000;)
  {
    while (Serial.available())
    {
      char c = Serial.read();
      Serial.print(c);
      if (gps.encode(c)) 
        newData = true;  
    }
  }
 /////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 vout=analogRead(sensor); //Reading the value from sensor

vout=(vout*500)/1023;

tempc=vout; 

int ldrStatus = analogRead(ldrPin);// Storing value in Degree Celsius
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
   if(Gsm.available()>0){
    textMessage = Gsm.readString();
   textMessage.toUpperCase();   
    delay(10);
  } 
  if(textMessage.indexOf("LOCAL")>=0){
    lcd.clear();
     lcd.print("Message Recevived");
     delay(3000);
     lcd.clear();
     lcd.print("Getting ");
     lcd.setCursor(0,1);
     lcd.print("Location ");
     delay(3000);
    float flat, flon;
    unsigned long age;
    gps.f_get_position(&flat, &flon, &age);   
    Gsm.print("AT+CMGF=1\r"); 
    delay(400);
    Gsm.print("AT+CMGS=\"");
    Gsm.print(phone_no);
    Gsm.println("\"");
    
     lcd.clear();
     lcd.print("Sending location");
     lcd.setCursor(0,1);
     lcd.print("To Base....");
     delay(3000);
    
    Gsm.println("Asheesh ,Battalion No. 1233456 ");
     Gsm.print("Temperature is  ");
      Gsm.println(tempc);

       Gsm.print("Heartbeat is  ");
      Gsm.println(ldrStatus/10);
    Gsm.print("http://maps.google.com/maps?q=loc:");
    
   // Gsm.print("Latitude = ");
    Gsm.print(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6);
    //Gsm.print(" Longitude = ");
    Serial.print(",");
    Gsm.print(flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6);
    delay(200);
    Gsm.println((char)26); // End AT command with a ^Z, ASCII code 26
    delay(200);
    Gsm.println();
    delay(10000);
    lcd.clear();
     lcd.print("location Sent");
     delay(3000);
  }
  
  state= digitalRead(6);
  if(state==1)     //If newData is true
  {
    float flat, flon;
    unsigned long age;
    gps.f_get_position(&flat, &flon, &age);   
    Gsm.print("AT+CMGF=1\r"); 
    delay(400);
    Gsm.print("AT+CMGS=\"");
    Gsm.print(phone_no);
    Gsm.println("\"");
    
     lcd.clear();
     lcd.print("Sending location");
     lcd.setCursor(0,1);
     lcd.print("To Base....");
     delay(3000);
    
    Gsm.println("Alert I need help....Asheesh ,Battalion No. 1233456 ");
     Gsm.print("Temperature is  ");
      Gsm.println(tempc);

       Gsm.print("Heartbeat is  ");
      Gsm.println(ldrStatus/10);
    
    Gsm.print("http://maps.google.com/maps?q=loc:");
    
   // Gsm.print("Latitude = ");
    Gsm.print(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6);
    //Gsm.print(" Longitude = ");
    Serial.print(",");
    Gsm.print(flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6);
    delay(200);
    Gsm.println((char)26); // End AT command with a ^Z, ASCII code 26
    delay(200);
    Gsm.println();
    delay(10000);
       lcd.clear();
     lcd.print("location Sent");
     delay(3000);
 
  }
    else{
   
     lcd.clear();
     lcd.print("Soldier Tracking");
     lcd.setCursor(0,1);
     lcd.print("System "); 
     delay(10);
     
   }
 
  Serial.println(failed);
 // if (chars == 0)
   // Serial.println("** No characters received from GPS: check wiring **");
}