Tutorial: Real Time GPS / GSM Tracker in Arduino

Video:

Description:
This is  a tutorial on how to start making your own GPS/GSM/GPRS Realtime tracking device which you can use for your robotics and iot projects.


Materials / Parts List:
1. Arduino Board
2. Any GPS Module
3. Any GSM/GPRS Module
4. 1x Resistor 1M
5. 1x Resistor 100K
6. 3x Resistor 220 ohm
7. 15uf 25v Capacitor
8. Breadboard / With Wires
9. External Power Supply min., 2Amp

Schematics:

Source Code:
#include "TinyGPS++.h"
#include "SoftwareSerial.h"
const byte _lBat = 2;
const int gpsL = 9;
SoftwareSerial gps_SerCon(5, 6); //tx, rx
TinyGPSPlus gps;
const byte rxPin = 10;        // aGPTX
const byte txPin = 11;        // aGPRX
const byte _lSim = 7;
SoftwareSerial _aGPR (rxPin, txPin);
char _regSimNo[] = "ATD09088638616";
char _smsPush[] = "AT+CMGS=\"09088638616\"\r";
float latThresh = 11.582408;//opyinal
float lonThresh = 122.758041;//optinal
float locStart = 0.000000;
float _poslocThresh = 200.000000; //distance thrghh
float _neglocThresh = -0.000060;
float locDiff = 0.000000;
float curLat = 0.000000;
float curLon = 0.000000;
float curLoc = 0.000000;

const int NUM_SAM = 10;
int _sumVCC = 0;
float r_Vol;
unsigned char s_count = 0;
float vol = 0.0;
int l_Pow = 0;
float v_Tresh = 5.60;




void setup()
{
  delay(4000);
  Serial.begin(115200);
  pinMode(gpsL, OUTPUT);
  pinMode(_lSim, OUTPUT);
  pinMode(_lBat, OUTPUT);
  p_Check();
  _parseGPRS();
  GPSCheck();
  //_pushSMS();
}

void loop()
{
  p_Check();
  _parseGDat();
  delay(50);
}


void GPSCheck() {
  delay(3000);

  gps_SerCon.begin(9600);
  Serial.println("GPS Marking...");
  digitalWrite(gpsL, HIGH);
  delay(500);
  while (locStart < 1.000000) {
    digitalWrite( _lBat, HIGH);
    digitalWrite(gpsL, LOW);
    digitalWrite(_lSim, HIGH);
    delay(15);
    for (int x = 0; x < 20; x++) {
      while (gps_SerCon.available())
      {
        gps.encode(gps_SerCon.read());
      }
      if (gps.location.isUpdated())
      {
        delay(50);
        latThresh = gps.location.lat();
        lonThresh = gps.location.lng();
        locStart = latThresh + lonThresh / 2;
        Serial.println(locStart, 6);
      }
      delay(15);
    }
    digitalWrite( _lBat, LOW);
    digitalWrite(gpsL, HIGH);
    digitalWrite(_lSim, LOW);
    delay(50);
  }
  digitalWrite(_lSim, HIGH);
  digitalWrite(gpsL, LOW);
  Serial.println("GPS Start");
}
void _parseGDat() {
  while (gps_SerCon.available())
  {
    digitalWrite(gpsL, LOW);
    gps.encode(gps_SerCon.read());
  }
  if (gps.location.isUpdated())
  {
    digitalWrite(gpsL, HIGH);
    delay(50);
    curLat = gps.location.lat();
    curLon = gps.location.lng();
    curLoc = curLat + curLon / 2;
    locDiff =  abs((locStart - curLoc) * 1000000);
    //Serial.print("Starting Location: ");
    //Serial.println(locStart,6);
    //Serial.print("Current Location: ");
    //Serial.println(curLoc,6);
    Serial.print("Location Difference: ");
    Serial.println(locDiff, 6);
    if (locDiff > _poslocThresh) {
      Serial.println("Sending Text Message");
      delay(100);
      digitalWrite( _lBat, HIGH);
      digitalWrite(gpsL, HIGH);
      digitalWrite(_lSim, HIGH);
      delay(5000);
      digitalWrite( _lBat, LOW);
      digitalWrite(gpsL, LOW);
      //_pushSMS();
      Serial.print(locStart, 6); Serial.print("  =>  ");
      locStart = curLoc;
      Serial.println(locStart, 6);
    }
  }
}
void _parseGPRS() {

  Serial.begin(115200);
  _aGPR.begin(115200);
  delay(5000);
  _aGPR.println("AT");
  digitalWrite(_lSim, HIGH);
  for (int timer = 0; timer < 3; timer++) {
    delay(10);
    String inData = _aGPR.readStringUntil('\n');
    Serial.println("Got response from AT: " + inData);
  }
  delay(100);
  _aGPR.println(_regSimNo);
  for (int timer = 0; timer < 25; timer++) {
    digitalWrite(_lSim, LOW);
    delay(15);
    String inData = _aGPR.readStringUntil('\n');
    Serial.println("Got response from AT: " + inData);
    digitalWrite(_lSim, HIGH);
    delay(15);
  }
  _aGPR.println("ATH");
  digitalWrite(_lSim, LOW);
  delay(3000);
  Serial.println("Done!");
  digitalWrite(_lSim, HIGH);
}
void _pushSMS() {
  _aGPR.println("AT+CMGF=1");
  delay(1000);
  _aGPR.println(_smsPush);
  delay(1000);
  _aGPR.println(gps.location.lat(), 6);
  delay(100);
  _aGPR.println(gps.location.lng(), 6);
  delay(100);
  _aGPR.println((char)26);
  delay(3000);
  _aGPR.println("AT+CMGD=1,4");
  delay(3000);
}


void p_Check() {
  l_Pow = _vccInStat();
  delay(75);
  while (l_Pow > 0) {
    digitalWrite(2, HIGH);
    delay(75);
    digitalWrite(2, LOW);
    delay(75);
    l_Pow = _vccInStat();
  } digitalWrite(2, LOW);
}
int _vccInStat() {
  while (s_count < NUM_SAM) {
    _sumVCC += analogRead(A0);
    s_count++;
    delay(10);
  }
  vol = ((float)_sumVCC / (float)NUM_SAM * 5.015) / 1024.0;
  r_Vol = (vol * 11.132);
  if (r_Vol < v_Tresh) {
    l_Pow = 1;
  } else {
    l_Pow = 0;
  }
  s_count = 0;
  _sumVCC = 0;
  return l_Pow;
}