TinyGPS

A Compact Arduino GPS/NMEA Parser

TinyGPS is designed to provide most of the NMEA GPS functionality I imagine an Arduino user would want – position, date, time, altitude, speed and course – without the large size that seems to accompany similar bodies of code.  To keep resource consumption low, the library avoids any mandatory floating point dependency and ignores all but a few key GPS fields.

Usage

To use, simply create an instance of an object like this:

#include "TinyGPS.h"
TinyGPS gps;

Feed the object serial NMEA data one character at a time using the encode() method. (TinyGPS does not handle retrieving serial data from a GPS unit.) When encode() returns “true”, a valid sentence has just changed the TinyGPS object’s internal state. For example:

#define RXPIN 3
#define TXPIN 2
SoftwareSerial nss(RXPIN, TXPIN);
void loop()
{
  while (nss.available())
  {
    int c = nss.read();
    if (gps.encode(c))
    {
      // process new gps info here
    }
  }
}

You can then query the object to get various tidbits of data. To test whether the data returned is stale, examine the (optional) parameter “fix_age” which returns the number of milliseconds since the data was encoded.

long lat, lon;
unsigned long fix_age, time, date, speed, course;
unsigned long chars;
unsigned short sentences, failed_checksum;

// retrieves +/- lat/long in 100000ths of a degree
gps.get_position(&lat, &lon, &fix_age);

// time in hhmmsscc, date in ddmmyy
gps.get_datetime(&date, &time, &fix_age);

// returns speed in 100ths of a knot
speed = gps.speed();

// course in 100ths of a degree
course = gps.course();

Statistics

The stats method provides a clue whether you are getting good data or not. It provides statistics that help with troubleshooting.

// statistics
gps.stats(&chars, &sentences, &failed_checksum);
  • chars – the number of characters fed to the object
  • sentences – the number of valid $GPGGA and $GPRMC sentences processed
  • failed_checksum – the number of sentences that failed the checksum test

Integral values

Values returned by the core TinyGPS methods are integral. Angular latitude and longitude measurements, for example, are provided in units of millionths of a degree, so instead of 90°30’00″, get_position() returns a longitude value of 90,500,000, or 90.5 degrees. But…

Using Floating Point

…for applications which are not resource constrained, it may be more convenient to use floating-point numbers. For these, TinyGPS offers several inline functions that return more easily-managed data. Don’t use these unless you can afford to link the floating-point libraries. Doing so may add 2000 or more bytes to the size of your application.

float flat, flon;

// returns +/- latitude/longitude in degrees
gps.f_get_position(&flat, &flon, &fix_age);
float falt = gps.f_altitude(); // +/- altitude in meters
float fc = gps.f_course(); // course in degrees
float fk = gps.f_speed_knots(); // speed in knots
float fmph = gps.f_speed_mph(); // speed in miles/hr
float fmps = gps.f_speed_mps(); // speed in m/sec
float fkmph = gps.f_speed_kmph(); // speed in km/hr

Date/time cracking

For more convenient access to date/time use this:

int year;
byte month, day, hour, minutes, second, hundredths;
unsigned long fix_age;

gps.crack_datetime(&year, &month, &day,
  &hour, &minute, &second, &hundredths, &fix_age);

Establishing a fix

TinyGPS objects depend on an external source, i.e. its host program, to feed valid and up-to-date NMEA GPS data. This is the only way to make sure that TinyGPS’s notion of the “fix” is current. Three things must happen to get valid position and time/date:

  1. You must feed the object serial NMEA data.
  2. The NMEA sentences must pass the checksum test.
  3. The NMEA sentences must report valid data. If the $GPRMC sentence reports a validity of “V” (void) instead of “A” (active), or if the $GPGGA sentence reports fix type “0″ (no fix) then those sentences are discarded.

To test whether the TinyGPS object contains valid fix data, pass the address of an unsigned long variable for the “fix_age” parameter in the methods that support it. If the returned value is TinyGPS::GPS_INVALID_AGE, then you know the object has never received a valid fix. If not, then fix_age is the number of milliseconds since the last valid fix. If you are “feeding” the object regularly, fix_age should probably never get much over 1000. If fix_age starts getting large, that may be a sign that you once had a fix, but have lost it.

float flat, flon;
unsigned long fix_age; // returns +- latitude/longitude in degrees
gps.f_get_position(&flat, &flon, &fix_age);
if (fix_age == TinyGPS::GPS_INVALID_AGE)
  Serial.println("No fix detected");
else if (fix_age > 5000)
  Serial.println("Warning: possible stale data!");
else
  Serial.println("Data is current.");

Interfacing with Serial GPS

To get valid and timely GPS fixes, you must provide a reliable NMEA sentence feed. If your NMEA data is coming from a serial GPS unit, connect it to Arduino’s hardware serial port, or, if using a “soft” serial port, make sure that you are using a reliable SoftSerial library. As of this writing (Arduino 0013), the SoftwareSerial library provided with the IDE is inadequate. It’s best to use my NewSoftSerial library, which builds upon the fine work ladyada did with the AFSoftSerial library.

Library Version

You can retrieve the version of the TinyGPS library by calling the static member library_version().

int ver = TinyGPS::library_version();

Resource Consumption

Linking the TinyGPS library to your application adds approximately 2500 bytes to its size, unless you are invoking any of the f_* methods. These require the floating point libraries, which might add another 600+ bytes.

Download

The latest version of TinyGPS is available here: TinyGPS13.zip

Change Log

  1. initial version
  2. << streaming, supports $GPGGA for altitude, floating point inline functions
  3. also extract lat/long/time from $GPGGA for compatibility with devices with no $GPRMC
  4. bug fixes
  5. API re-org, attach separate fix_age’s to date/time and position.
  6. Prefer encode() over operator<<. Encode() returns boolean indicating whether TinyGPS object has changed state.
  7. Changed examples to use NewSoftSerial in lieu of AFSoftSerial; rearranged the distribution package.
  8. Greater precision in latitude and longitude.  Angles measured in 10-5 degrees instead of 10-4 as previously.  Some constants redefined.
  9. Minor bug fix release: the fix_age parameter of get_datetime() was not being set correctly.
  10. Added Maarten Lamers’ distance_to() as a static function.
  11. Arduino 1.0 compatibility
  12. Added satellites(), hdop(), course_to(), and cardinal()
  13. Improved precision in latitude and longitude rendering. get_position() now returns angles in millionths of a degree.

Acknowledgements

Many thanks to Arduino forum users mem and Brad Burleson for outstanding help in alpha testing this code. Thanks also to Maarten Lamers, who wrote the wiring library that originally gave me the idea of how to organize TinyGPS.  Thanks also to Dan P. for suggesting that I increase the lat/long precision in version 8.  Thanks to many people who suggested new useful features for TinyGPS, especially Matt Monson, who wrote some nice sample code to do so.

All input is appreciated.

Mikal Hart

Page last updated on August 31, 2013 at 7:00 pm
701 Responses → “TinyGPS”
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  1. Mikal

    9 years ago

    What units would they be in, Ben?


  2. Mikal

    9 years ago

    @Jonas,

    TinyGPS is a parser. You can’t use it to transmit data.


  3. Mikal

    9 years ago

    @GOHO,

    Arduino prints floats with 2 decimals precision by default, but you can override this:

    Serial.print(lat, 6);

  4. Syah

    9 years ago

    I am using a Groove GPS module that uses ublox. How do I configure it in such away that it uses A-GPS?


  5. bbb

    9 years ago

    How can I print only new data from GPS not the same with previous? for example with comparing if will be new data!=previous data then to print serial .


  6. bbb

    9 years ago

    How can I print only new data not the same with previous? print to serial only new data changing


  7. Mikal

    9 years ago

    @bbb,

    There really isn’t a facility for detecting when the data changes, though you could test this manually. TinyGPS++ does have the facility to test for when a value is updated (though it might still have be the same number).


  8. Stanley

    9 years ago

    Hi, any plans to support BeiDou or GLONASS GPS module in the near future ?


  9. Alexis

    9 years ago

    Hello does it works with on an attiny85?
    thx


  10. Jose Domingues

    9 years ago

    Is TinyGPS compatible with Ublox Max-M8Q?
    I’ve been trying to test it using the example “test_with_gps_device” code and I can’t seem to get anything printed. I only get the RX chars and the Checksum. Sometimes checksum is zero, sometimes it’s another number, can’t figure out why this varies. But even when checksum is zero I can’t get any readings.
    I have tested Max-M8Q with PUBX example code and I do get a lock and readings.


  11. Ahmed Maher

    9 years ago

    I have skylab SKM53 GPS , and i use it with arduino , and I wish to get the speed , when I use the test_with_gps_device Example , I do not get any thing .. Why?!
    Thanks


  12. Charlie Harrison

    9 years ago

    This looks like a really good library. My only recommendation is that it adds support for DGPS data by outputting altitude and also there exists some NMEA strings that output magnetic declination which would also be useful to get.


  13. Longjohn

    9 years ago

    How hard would it be to to extend this library to parse NMEA depth and temperature data from a depthfinder so I can long that info along with the GPS coordinates? There are basically 3 sentences
    $SDDBT – Depth below transducer
    $SDDPT – Depth after finder adds the offset to DBT
    $SDMTW – water temperature


  14. Mikal

    9 years ago

    @Alexis, I haven’t tried it on ATTiny85, but I’m pretty certain it will work.


  15. Mikal

    9 years ago

    @Jose and @Ahmed Maher, can you print out a 3-second sample from the serial stream coming from your GPS?


  16. Mikal

    9 years ago

    @Charlie Harrison, I have tried not to support too many features that are unlikely to be used often (like magnetic declination). However, have your seen TinyGPS++? It supports custom sentences.


  17. Mikal

    9 years ago

    @Longjohn,

    Have you seen TinyGPS++? I would think it would be pretty easy to get these to work in TinyGPS++.


  18. Kurt Guldbaek

    9 years ago

    Hello.
    I am new in c-programming and Arduino.
    I am using tinyGPS++ in a project with 2 GPS in a kind of DGPS. Both GPS is logging data to SD. One is in the same pos all the time and the other is on a wagon, where the pos and magnetic field i logged. Later the data is compared to get the “real” pos of the wagon.
    For that porpose I would like to store the sentense from the GPS on the SD.
    Is it possible for me to add this feature?

    Kind regards Kurt


  19. Mikal

    9 years ago

    Hi Kurt,

    Yes, you can write the raw sentences to the SD. This doesn’t involve TinyGPS. When you get the character from the gps device with c = ss.read(); write it immediately to the SD card before (or after) you send it to gps.encode(). Remember that you have full control over the NMEA stream coming from the gps device.


  20. Samuel

    9 years ago

    Hi Mikal

    First I would like to thank you for both the TinyGPS and TinyGPS++

    My question regards lat. and long., is it possible to use lat and long to calculate the distance traveled? For example, when I power the GPS, it records lat and long and then begins calculating distance based on those first starting points?

    Thanks in advance


  21. Mikal

    9 years ago

    @Samuel–

    Yes, if you’ll capture the lat and long at the start and end points, then use the distance_between() member function, you can calculate the distance between them.


  22. Sid

    9 years ago

    I am using Skylab GPS module….. and i am trying to run the example code TinyGPS library. But i always get invalid values here is my code…..

    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
    ————————————————————————————————————————————-
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 29 0 1
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 105 0 11
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 181 0 22
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 257 0 33
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 333 0 44
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 409 0 55
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 485 0 66
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 561 0 77
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 637 0 87
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 713 0 97
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 789 0 107
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 940 0 128
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 1017 0 139
    **** **** ********* ********** **** ********** ******** **** ****** ****** ***** *** ******* ****** *** 1093 0 150


  23. Samuel

    9 years ago

    Hi Mikal, it’s me again

    I previously asked you about the possibility of obtaining distance traveled using lat and long, I am wondering if you would mind showing me how. I am new to this arduino but it’s a project due in a two weeks.

    Thanks

    Samuel


  24. Mike Dzado

    9 years ago

    Hi Mikal

    I have question regarding the SKM53.
    Page 3 of the SKM53 datasheet states that the UART is full duplex and page 4 specifies the $GPSxx strings that are available. It has a table that shows which GPS strings are available by default. This implies that we can configure the SKM53 via the comm port to enable and disable the GPS strings we would like to use.

    I would like to disable the $GPGSV and $GPGSA sentences. They are not needed for our application and are flooding the Comm port. We just need time and location.

    Can you write to the SKM53? If so, what are the commands to enable and disable GPS strings?

    Thanks
    Mike


  25. Mikal

    9 years ago

    @Sid, I don’t think that GPS operates at 4800 baud. Try 9600?


  26. Mikal

    9 years ago

    @Mike, TinyGPS is a parser. You can’t use it to write. If you want to write to the SKM53, just write to the serial port that you opened.


  27. Jakub Dražan

    9 years ago

    Hello,
    sometimes during an inicialization gps, the library return true on gps.encode(c), but date sets as 2000/00/00 and correct time. On next method calling (in next second) sets date correctly, but im premising, if gps.encode(c) return true, a have a correct datetime.

    Can i fixed this bug in library?

    With regard, Jakub


  28. Mikal

    9 years ago

    @Jakub,

    I’m aware of this condition, but I’m hesitant to call it a bug. By definition, encode() returns TRUE when a sentence has been properly processed. If the GPS chipset returns a properly-formed sentence with no valid date but potentially useful information, I don’t think it’s correct to make encode() return FALSE in that case. I think the best practice is just to check to ignore the date as long as it is invalid.


  29. TRK

    9 years ago

    How can I save and restore the almanach orbital data for sleeping gps module over 2 min?


  30. Puneet

    9 years ago

    these gps.encode nothing with my gps module i am using L80 GPS module u help me plz


  31. Bill

    9 years ago

    How can i change the altitude from meters to feet? I’m using a ublox neo6m gps with a nokia 5110 lcd display as a gps system. I have it almost exactly how i want it i just cant seem to figure out how to change the altitude. I’m new to arduino so i have alot to learn so any advice would be appreciated. Thanks!


  32. Mikal

    9 years ago

    @Bill,

    Well, there are about 3.28084 feet in every meter, so just take the meters and multiply by 3.28084. Alternatively, the TinyGPS++ library reports distances in various units.


  33. Steve

    9 years ago

    How would I be able to compare the GPS latitude and longitude data my GPS obtains to a known range of lat and long coordinates. If both the obtained lat and long coordinates match the set range, I would like a message to be sent to the serial monitor. Thank you.


  34. nadeem

    9 years ago

    when i use this code , i have got a lot of errors ,

    In file included from test_with_gps_device.cpp:3:
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:25:22: error: WProgram.h: No such file or directory
    In file included from test_with_gps_device.cpp:3:
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:81: error: ‘byte’ has not been declared
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:81: error: ‘byte’ has not been declared
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:82: error: ‘byte’ has not been declared
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:82: error: ‘byte’ has not been declared
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:82: error: ‘byte’ has not been declared
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:82: error: ‘byte’ has not been declared
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:130: error: ‘byte’ does not name a type
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:133: error: ‘byte’ does not name a type
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:134: error: ‘byte’ does not name a type
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:135: error: ‘byte’ does not name a type
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h: In member function ‘void TinyGPS::get_position(long int*, long int*, long unsigned int*)’:
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:48: error: ‘millis’ was not declared in this scope
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h: In member function ‘void TinyGPS::get_datetime(long unsigned int*, long unsigned int*, long unsigned int*)’:
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:57: error: ‘millis’ was not declared in this scope
    test_with_gps_device.cpp: In function ‘void loop()’:
    test_with_gps_device:39: error: ‘class TinyGPS’ has no member named ‘satellites’
    test_with_gps_device:39: error: ‘GPS_INVALID_SATELLITES’ is not a member of ‘TinyGPS’
    test_with_gps_device:40: error: ‘class TinyGPS’ has no member named ‘hdop’
    test_with_gps_device:40: error: ‘GPS_INVALID_HDOP’ is not a member of ‘TinyGPS’
    test_with_gps_device:42: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:43: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:46: error: ‘GPS_INVALID_F_ALTITUDE’ is not a member of ‘TinyGPS’
    test_with_gps_device:47: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:48: error: ‘GPS_INVALID_F_SPEED’ is not a member of ‘TinyGPS’
    test_with_gps_device:49: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:49: error: ‘cardinal’ is not a member of ‘TinyGPS’
    test_with_gps_device:50: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:51: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:51: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:51: error: ‘course_to’ is not a member of ‘TinyGPS’
    test_with_gps_device:51: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:52: error: ‘GPS_INVALID_F_ANGLE’ is not a member of ‘TinyGPS’
    test_with_gps_device:52: error: ‘cardinal’ is not a member of ‘TinyGPS’
    test_with_gps_device:52: error: ‘course_to’ is not a member of ‘TinyGPS’
    test_with_gps_device.cpp: In function ‘void print_date(TinyGPS&)’:
    test_with_gps_device:114: error: no matching function for call to ‘TinyGPS::crack_datetime(int*, byte*, byte*, byte*, byte*, byte*, byte*, long unsigned int*)’
    C:\Users\decent\Documents\Arduino\libraries\TinyGPS10/TinyGPS.h:82: note: candidates are: void TinyGPS::crack_datetime(int*, int*, int*, int*, int*, int*, int*, long unsigned int*)


  35. Mikal

    9 years ago

    @Steve–

    Couldn’t you just do something like:

    if (lat >= MIN_LAT && lat < = MAX_LAT && lng >= MIN_LNG && lng <= MAX_LNG)
    Serial.println(“In the region!”);


  36. Mikal

    9 years ago

    @nadeem, What Arduino IDE version are you using?


  37. Kazem

    9 years ago

    Mikal I have a technical question:
    I’m using Arduino Uno. I want to use the serial communication not only for GPS but for GSM board as well to send the Latitude + Longitude + and time by SMS to my phone.
    Is it possible to deactivate TX Pin in library and use it in GSM instead?!

    please share with me if u have any solution.
    Regard.


  38. Mikal

    9 years ago

    @Kazem, if you want two SOFT serial devices you can declare two NewSoftSerial objects, but you can only use one at a time. See NewSoftSerial documentation for details. Alternatively, put one device on HardwareSerial (pins 0 1) and the other on your software serial pins.


  39. Phil

    9 years ago

    Hello Mikal

    Great library, makes GPS work so easy. I have an application where I have run out of SRAM in a UNO. Is there a consideration where you library might use off chip SPI SRAM to do it’s work and leave the UNO memory free for other things? yes moving to a Mega would more than likely solve my issue however boards have been made etc.

    Kind regards
    Phil


  40. Punith

    9 years ago

    will this work with GTPA010??? am not getting lat and lang am just getting char and err


  41. Mikal

    9 years ago

    Hi @Phil,

    I don’t have any plans to try to support external SPI RAM. How would that work?


  42. Mikal

    9 years ago

    @Punith, make sure your character stream from the GPS is correct before sending it to the TinyGPS library. Print each character with Serial.write(c).


  43. Stefan

    9 years ago

    Hi Mikal

    Great library!
    Love the functions. Save a lot of time in my projects.

    I wonder if it’s possible to extract the exact gps coords ddmm.mmmm without converting to deg.decimal_degree.


  44. kartik

    9 years ago

    major_pr.ino: In function ‘void gpsdump(TinyGPS&)’:
    major_pr:22: error: too few arguments to function ‘void print_float(float, float, int, int, int)’
    major_pr:95: error: at this point in file

    plz tell what is this error and how to solve it I m new in this ….


  45. Eric Grammatico

    9 years ago

    Hello Mikal,

    I am testing TinyGPS13. Very good stuff ! Congrat !

    I am not able to retrieve the date from GPRMC records:
    “$GPRMC,163921.000,A,4339.8807,N,00655.7857,E,0.15,40.52,190415,,,A*5E”

    Here is my code (I just added some few lines to your sample):
    ” if (newData)
    {
    float flat, flon;
    unsigned long age, gps_date, gps_time;
    gps.f_get_position(&flat, &flon, &age);
    gps.get_datetime(&gps_date, &gps_time, &age);
    Serial.print(“LAT=”);
    Serial.print(flat == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flat, 6);
    Serial.print(” LON=”);
    Serial.print(flon == TinyGPS::GPS_INVALID_F_ANGLE ? 0.0 : flon, 6);
    Serial.print(” SAT=”);
    Serial.print(gps.satellites() == TinyGPS::GPS_INVALID_SATELLITES ? 0 : gps.satellites());
    Serial.print(” PREC=”);
    Serial.println(gps.hdop() == TinyGPS::GPS_INVALID_HDOP ? 0 : gps.hdop());

    Serial.print(“Date: “);
    Serial.println(gps_date);
    Serial.print(“Time: “);
    Serial.println(gps_time);
    }
    ”

    And the result:
    “Simple TinyGPS library v. 13
    by Mikal Hart

    LAT=43.664794 LON=6.929605 SAT=5 PREC=159
    Date: 0
    Time: 16521500
    CHARS=142 SENTENCES=1 CSUM ERR=1
    ”

    Am I doing something wrong ?

    Thanks a lot for your support.

    Regards,

    Eric.


  46. Mikal

    9 years ago

    @Stefan, you should be able to extract raw data using TinyGPS++’s custom objects. Have you tried that?


  47. Mikal

    9 years ago

    @kartik, I won’t be able to easily tell the problem in your code unless you share it.


  48. Nolan

    8 years ago

    #include
    TinyGPSPlus gps;

    void setup()
    {
    Serial1.begin(9600); // opens serial port
    }
    void loop()
    {
    while (Serial1.available() > 0) //While data is available from the Airmar on pins REx and Tx, do:
    gps.encode(Serial1.read); //read the information and parse the positions into the object class
    if (gps.location.isUpdated())
    {
    Serial.print(“LAT=”); Serial.print(gps.location.lat(), 6);
    Serial.print(“LNG=”); Serial.println(gps.location.lng(), 6);
    }

    I am receiving the following error:
    GPS_WayPoints.ino: In function ‘void loop()’:
    GPS_WayPoints.ino:120:28: error: no matching function for call to ‘TinyGPSPlus::encode()’
    GPS_WayPoints.ino:120:28: note: candidate is:
    C:\energia-0101E0015\hardware\msp430\libraries\TinyGPSPlus/TinyGPS++.h:218:8: note: bool TinyGPSPlus::encode(char)
    C:\energia-0101E0015\hardware\msp430\libraries\TinyGPSPlus/TinyGPS++.h:218:8: note: no known conversion for argument 1 from ” to ‘char’

    Any idea on how to fix this? I know the libraries of TinyGPS are being included because i can see them being used in the compile folder.

    Thanks,
    Nolan


  49. Mikal

    8 years ago

    @Nolan:

    gps.encode(Serial1.read()); // <- note extra parentheses


  50. Nikhat

    8 years ago

    Hi,
    im getting data on serial monitor when i upload this code to arduino-

    void setup() { // put your setup code here, to run once:}
    void loop() {// put your main code here, to run repeatedly:}

    but when i upload tinygps++ device example or full example ,why i don’t get any thing?

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