MEGA 2560 and ITEAD gps

hi there, i have looked at the forum and could not actually find a related scenario, i have a mega with itead gps shield attached i have uploaded the code from the forum which states a working code for this shield, serial monitor reports only;

Sats HDOP Latitude Longitude Fix Date Time Date Alt Course Speed Card Distance Course Card Chars Sentences Checksum
(deg) (deg) Age Age (m) — from GPS ---- ---- to London ---- RX RX Fail

**** **** ******* ******* **** ******* ******* **** ******* ****** ***** *** 0 0.00 *** 0 0 0
**** **** ******* ******* **** ******* ******* **** ******* ****** ***** *** 0 0.00 *** 0 0 0

is there a way to check to see if the gps shield is working, i have just purchased this shield.

my code is;

#include <TinyGPS.h>

TinyGPS gps;

static void gpsdump(TinyGPS &gps);
static bool feedgps();
static void print_float(float val, float invalid, int len, int prec);
static void print_int(unsigned long val, unsigned long invalid, int len);
static void print_date(TinyGPS &gps);
static void print_str(const char *str, int len);

void setup()
{
Serial.begin(9600);

Serial.print(“Testing TinyGPS library v. “); Serial.println(TinyGPS::library_version());
Serial.println(“by Mikal Hart”);
Serial.println();
Serial.print(“Sizeof(gpsobject) = “); Serial.println(sizeof(TinyGPS));
Serial.println();
Serial.println(“Sats HDOP Latitude Longitude Fix Date Time Date Alt Course Speed Card Distance Course Card Chars Sentences Checksum”);
Serial.println(” (deg) (deg) Age Age (m) — from GPS ---- ---- to London ---- RX RX Fail”);
Serial.println(”--------------------------------------------------------------------------------------------------------------------------------------”);
}

void loop()
{
bool newdata = false;
unsigned long start = millis();

// Every second we print an update
while (millis() - start < 1000)
{
if (feedgps())
newdata = true;
}

gpsdump(gps);
}

static void gpsdump(TinyGPS &gps)
{
float flat, flon;
unsigned long age, date, time, chars = 0;
unsigned short sentences = 0, failed = 0;
static const float LONDON_LAT = 51.508131, LONDON_LON = -0.128002;

print_int(gps.satellites(), TinyGPS::GPS_INVALID_SATELLITES, 5);
print_int(gps.hdop(), TinyGPS::GPS_INVALID_HDOP, 5);
gps.f_get_position(&flat, &flon, &age);
print_float(flat, TinyGPS::GPS_INVALID_F_ANGLE, 9, 5);
print_float(flon, TinyGPS::GPS_INVALID_F_ANGLE, 10, 5);
print_int(age, TinyGPS::GPS_INVALID_AGE, 5);

print_date(gps);

print_float(gps.f_altitude(), TinyGPS::GPS_INVALID_F_ALTITUDE, 8, 2);
print_float(gps.f_course(), TinyGPS::GPS_INVALID_F_ANGLE, 7, 2);
print_float(gps.f_speed_kmph(), TinyGPS::GPS_INVALID_F_SPEED, 6, 2);
print_str(gps.f_course() == TinyGPS::GPS_INVALID_F_ANGLE ? "*** " : TinyGPS::cardinal(gps.f_course()), 6);
print_int(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0UL : (unsigned long)TinyGPS::distance_between(flat, flon, LONDON_LAT, LONDON_LON) / 1000, 0xFFFFFFFF, 9);
print_float(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : TinyGPS::course_to(flat, flon, 51.508131, -0.128002), TinyGPS::GPS_INVALID_F_ANGLE, 7, 2);
print_str(flat == TinyGPS::GPS_INVALID_F_ANGLE ? "*** " : TinyGPS::cardinal(TinyGPS::course_to(flat, flon, LONDON_LAT, LONDON_LON)), 6);

gps.stats(&chars, &sentences, &failed);
print_int(chars, 0xFFFFFFFF, 6);
print_int(sentences, 0xFFFFFFFF, 10);
print_int(failed, 0xFFFFFFFF, 9);
Serial.println();
}

static void print_int(unsigned long val, unsigned long invalid, int len)
{
char sz[32];
if (val == invalid)
strcpy(sz, “*******”);
else
sprintf(sz, “%ld”, val);
sz[len] = 0;
for (int i=strlen(sz); i<len; ++i)
sz = ’ ';

  • if (len > 0)*
  • sz[len-1] = ’ ';*
  • Serial.print(sz);*
  • feedgps();*
    }
    static void print_float(float val, float invalid, int len, int prec)
    {
  • char sz[32];*
  • if (val == invalid)*
  • {*
    _ strcpy(sz, “*******”);_
  • sz[len] = 0;*
  • if (len > 0)*
  • sz[len-1] = ’ ';*
  • for (int i=7; i<len; ++i)*
    _ sz = ’ ';_
    * Serial.print(sz);*
    * }*
    * else*
    * {*
    * Serial.print(val, prec);*
    * int vi = abs((int)val);*
    * int flen = prec + (val < 0.0 ? 2 : 1);*
    * flen += vi >= 1000 ? 4 : vi >= 100 ? 3 : vi >= 10 ? 2 : 1;*
    * for (int i=flen; i<len; ++i)*
    * Serial.print(" ");*
    * }*
    * feedgps();*
    }
    static void print_date(TinyGPS &gps)
    {
    * int year;*
    * byte month, day, hour, minute, second, hundredths;*
    * unsigned long age;*
    * gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age);
    if (age == TinyGPS::GPS_INVALID_AGE)
    _ Serial.print("****** ******* ");
    * else*
    * {*
    * char sz[32];*
    * sprintf(sz, "%02d/%02d/%02d %02d:%02d:%02d ",*
    * month, day, year, hour, minute, second);*
    * Serial.print(sz);*
    * }*
    * print_int(age, TinyGPS::GPS_INVALID_AGE, 5);
    _
    feedgps();*

    }
    static void print_str(const char str, int len)
    _
    {_
    _
    int slen = strlen(str);_
    _
    for (int i=0; i<len; ++i)_
    _ Serial.print(i<slen ? str : ’ ');
    feedgps();
    }
    static bool feedgps()
    {
    while (Serial.available())
    {
    if (gps.encode(Serial.read()))
    return true;
    }
    return false;
    }*_
static bool feedgps()
{
  while (Serial.available())
  {
    if (gps.encode(Serial.read()))
      return true;
  }
  return false;
}

You appear to be trying to use the Serial port to talk to the GPS and the Serial Monitor. Fail!

Connect the GPS to another Serial instance's pins.

Please post your code inside the tags, i.e. use the # icons on the text editor tool bar

Hi Everyone,

I just buy ITEAD GPS last time, and i have a problem with jumper set and wiring to Mega 2560. I want to know what’s the right jumper and wiring to mega 2560 ?

here is the sample code :

#include <TinyGPS.h>

TinyGPS gps;

static void gpsdump(TinyGPS &gps);
static bool feedgps();
static void print_float(float val, float invalid, int len, int prec);
static void print_int(unsigned long val, unsigned long invalid, int len);
static void print_date(TinyGPS &gps);
static void print_str(const char *str, int len);

void setup()
{
  Serial.begin(9600);
  
  Serial.print("Testing TinyGPS library v. "); Serial.println(TinyGPS::library_version());
  Serial.println("by Mikal Hart");
  Serial.println();
  Serial.print("Sizeof(gpsobject) = "); Serial.println(sizeof(TinyGPS));
  Serial.println();
  Serial.println("Sats HDOP Latitude Longitude Fix  Date       Time       Date Alt     Course Speed Card  Distance Course Card  Chars Sentences Checksum");
  Serial.println("          (deg)    (deg)     Age                        Age  (m)     --- from GPS ----  ---- to London  ----  RX    RX        Fail");
  Serial.println("--------------------------------------------------------------------------------------------------------------------------------------");
}

void loop()
{
  bool newdata = false;
  unsigned long start = millis();
  
  // Every second we print an update
  while (millis() - start < 1000)
  {
    if (feedgps())
      newdata = true;
  }
  
  gpsdump(gps);
}

static void gpsdump(TinyGPS &gps)
{
  float flat, flon;
  unsigned long age, date, time, chars = 0;
  unsigned short sentences = 0, failed = 0;
  static const float LONDON_LAT = 51.508131, LONDON_LON = -0.128002;
  
  print_int(gps.satellites(), TinyGPS::GPS_INVALID_SATELLITES, 5);
  print_int(gps.hdop(), TinyGPS::GPS_INVALID_HDOP, 5);
  gps.f_get_position(&flat, &flon, &age);
  print_float(flat, TinyGPS::GPS_INVALID_F_ANGLE, 9, 5);
  print_float(flon, TinyGPS::GPS_INVALID_F_ANGLE, 10, 5);
  print_int(age, TinyGPS::GPS_INVALID_AGE, 5);

  print_date(gps);

  print_float(gps.f_altitude(), TinyGPS::GPS_INVALID_F_ALTITUDE, 8, 2);
  print_float(gps.f_course(), TinyGPS::GPS_INVALID_F_ANGLE, 7, 2);
  print_float(gps.f_speed_kmph(), TinyGPS::GPS_INVALID_F_SPEED, 6, 2);
  print_str(gps.f_course() == TinyGPS::GPS_INVALID_F_ANGLE ? "*** " : TinyGPS::cardinal(gps.f_course()), 6);
  print_int(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0UL : (unsigned long)TinyGPS::distance_between(flat, flon, LONDON_LAT, LONDON_LON) / 1000, 0xFFFFFFFF, 9);
  print_float(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : TinyGPS::course_to(flat, flon, 51.508131, -0.128002), TinyGPS::GPS_INVALID_F_ANGLE, 7, 2);
  print_str(flat == TinyGPS::GPS_INVALID_F_ANGLE ? "*** " : TinyGPS::cardinal(TinyGPS::course_to(flat, flon, LONDON_LAT, LONDON_LON)), 6);

  gps.stats(&chars, &sentences, &failed);
  print_int(chars, 0xFFFFFFFF, 6);
  print_int(sentences, 0xFFFFFFFF, 10);
  print_int(failed, 0xFFFFFFFF, 9);
  Serial.println();
}

static void print_int(unsigned long val, unsigned long invalid, int len)
{
  char sz[32];
  if (val == invalid)
    strcpy(sz, "*******");
  else
    sprintf(sz, "%ld", val);
  sz[len] = 0;
  for (int i=strlen(sz); i<len; ++i)
    sz[i] = ' ';
  if (len > 0) 
    sz[len-1] = ' ';
  Serial.print(sz);
  feedgps();
}

static void print_float(float val, float invalid, int len, int prec)
{
  char sz[32];
  if (val == invalid)
  {
    strcpy(sz, "*******");
    sz[len] = 0;
        if (len > 0) 
          sz[len-1] = ' ';
    for (int i=7; i<len; ++i)
        sz[i] = ' ';
    Serial.print(sz);
  }
  else
  {
    Serial.print(val, prec);
    int vi = abs((int)val);
    int flen = prec + (val < 0.0 ? 2 : 1);
    flen += vi >= 1000 ? 4 : vi >= 100 ? 3 : vi >= 10 ? 2 : 1;
    for (int i=flen; i<len; ++i)
      Serial.print(" ");
  }
  feedgps();
}

static void print_date(TinyGPS &gps)
{
  int year;
  byte month, day, hour, minute, second, hundredths;
  unsigned long age;
  gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age);
  if (age == TinyGPS::GPS_INVALID_AGE)
    Serial.print("*******    *******    ");
  else
  {
    char sz[32];
    sprintf(sz, "%02d/%02d/%02d %02d:%02d:%02d   ",
        month, day, year, hour, minute, second);
    Serial.print(sz);
  }
  print_int(age, TinyGPS::GPS_INVALID_AGE, 5);
  feedgps();
}

static void print_str(const char *str, int len)
{
  int slen = strlen(str);
  for (int i=0; i<len; ++i)
    Serial.print(i<slen ? str[i] : ' ');
  feedgps();
}

static bool feedgps()
{
  while (Serial.available())
  {
    if (gps.encode(Serial.read()))
      return true;
  }
  return false;
}

I use same code with your code in the forum i have read. and my wiring setup and jumper setup like this :

and the results like this :

am I wrong with the jumper and wiring setup? I’m sorry bad in english

Thanks in advance
Agung Nugroho

Check this code . It might solve your problem

main_c.rar (1.5 KB)