i just want to know the proram meaning

[rupa]

i am using a arduino uno board one of my friend had write a code i want to know the meaning of this code 

 

#include<LiquidCrystal.h>

LiquidCrystal lcd(2,3,4,5,6,7,11);

 

#define vibrate_sense 9

#define buzzer 12

 

char str[70];

char test[]="$GPGGA";      

char logitude[10];

char latitude[10];

 

int i,j,k;

int temp;

//int Ctrl+z=26;    //for sending msg

int led=13;

 

void setup()

{

  lcd.begin(16,2);

  Serial.begin(4800);

  pinMode(vibrate_sense, INPUT);

  pinMode(led, OUTPUT);

  pinMode(buzzer,OUTPUT);

  lcd.setCursor(0,0);

  lcd.print("GPS Besed Vehicle ");

  lcd.setCursor(0,1);

  lcd.print("Tracking System");

  delay(3000);

}

 

void loop()

{

  if (digitalRead(vibrate_sense) == HIGH)

  {

    for(i=18;i<27;i++)          //extract latitude from string

    {

      latitude[j]=str;

      j++;

    }

   

    for(i=30;i<40;i++)          //extract longitude from string

    {

      logitude[k]=str;

      k++;

    }

    digitalWrite(buzzer,HIGH);

    lcd.setCursor(0,0);        //display latitude and longitude on 16X2 lcd display 

    lcd.print("Lat(N)");

    lcd.print(latitude);

    lcd.setCursor(0,1);

    lcd.print("Lon(E)");

    lcd.print(logitude);

    delay(100);

    Serial.begin(9600);

    Serial.println("AT+CMGF=1");    //select text mode

    delay(10);

    Serial.println("AT+CMGS=8@@@@@@@@@"");  // enter receipent number

    Serial.println("Vehicle Accident Happend at Place:");

    Serial.print("Latitude(N): ");             //enter latitude in msg

    Serial.println(latitude);                  //enter latitude value in msg

    Serial.print("Longitude(E): ");            //enter Longitude in Msg

    Serial.println(logitude);                  //enter longitude value in msg

    Serial.print("Help Please");

    Serial.write(26);                      //send msg  Ctrl+z=26

    temp=0;

    i=0;

    j=0;

    k=0;

    delay(20000);                        // next reading within 20 seconds

    Serial.begin(4800);

  }

  else

  {

   for(i=18;i<27;i++)          //extract latitude from string

    {

      latitude[j]=str;

      j++;

    }

   

    for(i=30;i<40;i++)          //extract longitude from string

    {

      logitude[k]=str;

      k++;

    }

   

    lcd.setCursor(0,0);        //display latitude and longitude on 16X2 lcd display 

    lcd.print("Lat(N)");

    lcd.print(latitude);

    lcd.setCursor(0,1);

    lcd.print("Lon(E)");

    lcd.print(logitude);

    delay(100);

    Serial.begin(9600);

    Serial.println("AT+CMGF=1");    //select text mode

    delay(10);

    Serial.println("AT+CMGS="8@@@@@@"");  // enter receipent number

    Serial.println("Vehicle location Place:");

    Serial.print("Latitude(N): ");             //enter latitude in msg

    Serial.println(latitude);                  //enter latitude value in msg

    Serial.print("Longitude(E): ");            //enter Longitude in Msg

    Serial.println(logitude);                  //enter longitude value in msg

    Serial.write(26);                      //send msg  Ctrl+z=26

    temp=0;

    i=0;

    j=0;

    k=0;

    delay(200000);                        // next reading within 20 seconds

    Serial.begin(4800); 

  }

}

 

void serialEvent()

{

  while (Serial.available())            //Serial incomming data from GPS

  {

    char inChar = (char)Serial.read();

     str= inChar;                    //store incomming data from GPS to temparary string str[]

     i++;

     if (i < 7)                      

     {

      if(str[i-1] != test[i-1])         //check for right string

      {

        i=0;

      }

     }

    if(i >=60)

    {

     break;

    }

  }

}

[Hari Prasaath K]

This is the written for accident detection (using vibration sensor) of vechicles and locate the position (using GPS module) where it is happened and it is send to the particular mobile (using GSM module). For your clear understanding refer the below link.

 https://www.engineersgarage.com/contribution/accident-detection-and-messaging-system-using-gsm-and-gps

[Author]

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