HaCking a TK102b GPS.GSM.GPRS Tracker "Coban" and using the goodies of it

I recently bought a Chinese GPS tracker, that worked for 3 months, now is blinking for 10 seconds and nothing else!, i can use it in my Xmass tree only!!

Anyway i open it up and i saw that is COBAN brand , with a red Logo very similar to SIMcom logo!

the GPS module writes Coban NS-1315, i google it and i found this document…

OK now i know where is the TX and the RX, i took my ARDUINO Mega board
i gave to the TK102b 3.3volts , and GND , i coonected the TX to rx of arduino and RX to TX of arduino
and i just run this code

// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver

#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
 // If you're using a GPS module:
// Connect the GPS Power pin to 5V
// Connect the GPS Ground pin to ground
// If using software serial (sketch example default):
//   Connect the GPS TX (transmit) pin to Digital 3
//   Connect the GPS RX (receive) pin to Digital 2
// If using hardware serial (e.g. Arduino Mega):
//   Connect the GPS TX (transmit) pin to Arduino RX1, RX2 or RX3
//   Connect the GPS RX (receive) pin to matching TX1, TX2 or TX3

// If you're using the Adafruit GPS shield, change 
// SoftwareSerial mySerial(3, 2); -> SoftwareSerial mySerial(8, 7);
// and make sure the switch is set to SoftSerial

// If using software serial, keep these lines enabled
// (you can change the pin numbers to match your wiring):
// SoftwareSerial mySerial(3, 2);

//Adafruit_GPS GPS(&mySerial);
// If using hardware serial (e.g. Arduino Mega), comment
// out the above six lines and enable this line instead:
 Adafruit_GPS GPS(&Serial1);

// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences. 
#define GPSECHO  true

// this keeps track of whether we're using the interrupt
// off by default!
boolean usingInterrupt = false;
void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy

void setup()  
  // connect at 115200 so we can read the GPS fast enough and echo without dropping chars
  // also spit it out
  Serial.println("Adafruit GPS library basic test!");

  // 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
  // uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
  // uncomment this line to turn on only the "minimum recommended" data
  // For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
  // the parser doesn't care about other sentences at this time
  // Set the update rate
  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);   // 1 Hz update rate
  // For the parsing code to work nicely and have time to sort thru the data, and
  // print it out we don't suggest using anything higher than 1 Hz

  // Request updates on antenna status, comment out to keep quiet

  // the nice thing about this code is you can have a timer0 interrupt go off
  // every 1 millisecond, and read data from the GPS for you. that makes the
  // loop code a heck of a lot easier!

  // Ask for firmware version

// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
  char c = GPS.read();
  // if you want to debug, this is a good time to do it!
#ifdef UDR0
  if (GPSECHO)
    if (c) UDR0 = c;  
    // writing direct to UDR0 is much much faster than Serial.print 
    // but only one character can be written at a time. 

void useInterrupt(boolean v) {
  if (v) {
    // Timer0 is already used for millis() - we'll just interrupt somewhere
    // in the middle and call the "Compare A" function above
    OCR0A = 0xAF;
    TIMSK0 |= _BV(OCIE0A);
    usingInterrupt = true;
  } else {
    // do not call the interrupt function COMPA anymore
    TIMSK0 &= ~_BV(OCIE0A);
    usingInterrupt = false;

uint32_t timer = millis();
void loop()                     // run over and over again
  // in case you are not using the interrupt above, you'll
  // need to 'hand query' the GPS, not suggested :(
  if (! usingInterrupt) {
    // read data from the GPS in the 'main loop'
    char c = GPS.read();
    // if you want to debug, this is a good time to do it!
    if (GPSECHO)
      if (c) Serial.print(c);
  // if a sentence is received, we can check the checksum, parse it...
  if (GPS.newNMEAreceived()) {
    // a tricky thing here is if we print the NMEA sentence, or data
    // we end up not listening and catching other sentences! 
    // so be very wary if using OUTPUT_ALLDATA and trytng to print out data
    //Serial.println(GPS.lastNMEA());   // this also sets the newNMEAreceived() flag to false
    if (!GPS.parse(GPS.lastNMEA()))   // this also sets the newNMEAreceived() flag to false
      return;  // we can fail to parse a sentence in which case we should just wait for another

  // if millis() or timer wraps around, we'll just reset it
  if (timer > millis())  timer = millis();

  // approximately every 2 seconds or so, print out the current stats
  if (millis() - timer > 2000) { 
    timer = millis(); // reset the timer
    Serial.print("\nTime: ");
    Serial.print(GPS.hour, DEC); Serial.print(':');
    Serial.print(GPS.minute, DEC); Serial.print(':');
    Serial.print(GPS.seconds, DEC); Serial.print('.');
    Serial.print("Date: ");
    Serial.print(GPS.day, DEC); Serial.print('/');
    Serial.print(GPS.month, DEC); Serial.print("/20");
    Serial.println(GPS.year, DEC);
    Serial.print("Fix: "); Serial.print((int)GPS.fix);
    Serial.print(" quality: "); Serial.println((int)GPS.fixquality); 
    if (GPS.fix) {
      Serial.print("Location: ");
      Serial.print(GPS.latitude); Serial.print(GPS.lat);
      Serial.print(", "); 
      Serial.print(GPS.longitude); Serial.println(GPS.lon);
      Serial.print("Speed (knots): "); Serial.println(GPS.speed);
      Serial.print("Angle: "); Serial.println(GPS.angle);
      Serial.print("Altitude: "); Serial.println(GPS.altitude);
      Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
      Serial.print(" http://maps.google.com/maps?q=");Serial.print(conv_coords(GPS.latitude));Serial.print(",");Serial.println(conv_coords(GPS.longitude)); 
      float flat, flon;

  float conv_coords(float in_coords)
  //Initialize the location.
  float f = in_coords;
  // Get the first two digits by turning f into an integer, then doing an integer divide by 100;
  // firsttowdigits should be 77 at this point.
  int firsttwodigits = ((int)f)/100;                               //This assumes that f < 10000.
  float nexttwodigits = f - (float)(firsttwodigits*100);
  float theFinalAnswer = (float)(firsttwodigits + nexttwodigits/60.0);
  return theFinalAnswer;

BINGO worked like a charm, i got 10 satellites and a beautiful GPS fix in 1 minute…!!!

Now i want more!!! , i need to find out the COBAN S-900A mistery GPS.GPRS module , in order to use it like a SIM900 module for GSM capabilities., but I cannot find NOWHERE any datasheet with the pin out, Nowhere!

Is there anyone know where can i find anything??
i searched for SIM900a datasheet but the pins are not similar…
in case i find something i will make my software for GPS tracking and also i will add a 3axis sensor for more features with a fraction of cost! (Ofcurse i will share everything and i will post links and progress)

inside the “Coban S-900A” there is a MediaTek - MT6253 core

Did you get the GSM.GPRS module working?

Hi gc9n, did you or anyone have any progress with this? I'd like to get the original firmware and customize it, would that be possible?