Dear Mikal,

I’ve figure out a way to decode BeiDou GPS receiver … I took yr code and only change the 2 defines from GP to GN..

#define _GPRMCterm “GNRMC”
#define _GPGGAterm “GNGGA”

There is an extra NMEA sentences called BDGSA similar to BDGSA to check for DOP & active Sats , add both the Sats up would give the total Sats in view…

Could you add this BeiDou support to your next version release ?

Thanks in advance..

Hello,

Is it possible to turn al LED on when there is a fix and an other when there is no fix?
Tried couple of things, but don’t work…

Thanks!

Thanks for the really beautiful and simple impl. of this library!

I’m using the Adafruit Ultimate GPS module and is trying to parse out altitude and hdop values. But both end up beeing zero all the time. My module does seem to be supporting those NMEA strings… Any tips on what could be wrong? Also lacking a few decimal to get accurate position.

Thanks!
Fredrik

Mikal,

Hi. Thank you for the library. Does the function “distanceBetween” calculate distance to another lat/lon location using the curvature of the earth calculations? Thanks!

Used tinyGPS and now plus, with a uBlox NEO 6M successfully (got the data i wanted flawlessly). Now i’m trying to use uBlox LEA 6H from 3drobotics (Ardupilot 2.6). They have configured it for UBX data, but i managed to change the output to NMEA only.
All i get is this (increasing Chars and Passed)
DIAGS Chars=6560 Sentences-with-Fix=0 Failed-checksum=0 Passed-checksum=103
I’ve waited for over an hour and still getting this.
Using u-center (uBlox software) the LEA 6H locks after a minute (2′ tops).

Hi Mikal,
First of all, the Tinygps is superb! It works great! Well done!
I’m using a up501 gps module connected to Serial2 on my Arduino Mega 2560.
Is there a way to get the gps to get a fix, and then restart it to get a new fix without turning anything off?
I want my arduino to get gps fix data, do some other stuff for a few minutes, and then get a new gps fix and the old fix data to be erased.
Is that possible?
Thanks for your help!
Yaron

/*
GPS_Tiny
Consistent read of GPS serial
Created 17.10.2014
By Thor Valo
*/

#include “TinyGPS++.h” // http://arduiniana.org/libraries/tinygpsplus/

#include ; // required for virtual RX, TX

TinyGPSPlus gps;
SoftwareSerial gpsSerial(10, 11); // RX, TX (TX not used)

const int serialTime = 100; // enough time to read all NMEA sentences once

void setup()
{
Serial.begin(115200);
gpsSerial.begin(9600);
} // end setup

void loop()
{
int start = millis(); // reference for starting timestamp
int now = millis();

do {
while (gpsSerial.available() > 0) {
gps.encode(gpsSerial.read());
}
now = millis();
} while ((now – start < serialTime)); // breaks out of read gps serial

if (gps.location.isUpdated())
{
Serial.print("Lat: "); Serial.println(gps.location.lat(), 6);
Serial.print("Lng: "); Serial.println(gps.location.lng(), 6);
}

if (gps.altitude.isUpdated()) {
Serial.print("Alt: "); Serial.println(gps.altitude.meters());
}
} // end main loop()

Dear Mikal you have done a great work! I am pretty sure I will use it in my next gps project. This is my first time I play with gps and I need more accuracy than 2.5 meters provided from all gps shields. Someone told me it can be improved calibrating the gps, I checked on internet but no luck. Do you have any library to suggest or any useful information about it?

Thank you for sharing!
Alessandro

Hi Mikal! I’m trying to use version 13 TinyGPS.h, and I had trouble reading the data (data not printing), however I do the same with the V.12 version and if I print the data correctly (using test_with_gps_device). I have tried using the library TinyGPSPlus.h but neither works. the gps is working but does not show me any data (CHARS = 0 = 0 CSUM SENTENCES ERR = 0
No characters ** received from GPS: check wiring **
  CHARS = 0 = 0 CSUM SENTENCES ERR = 0
). I have an Arduino UNO and GPS VPN1513. You have any idea what it could be?

Hey there!

First of all, I would like to thank you, Mikal, for sharing TinyGPS++. It’s awesome. Definitely, a piece of well done work.

I have just spotted why my code wasn’t working perfectly OK with TinyGPS++ lib and I have thought it might be useful to other users or even a nice contribution to a new version of the lib.

My GNSS device was outputting good data (I checked it by bypassing it through serial) but when at building and printing my propietary frame, I couldn’t get proper values for location.lat(), lng(), kmph(), gps time functions… GPS time suddenly freezed, and lat and lng kept outputting 0 after receiveng data fixes with such information.

I was about going mad, thoroughly reviewing Mikal’s code, trying to understand what was happening “behind the scenes”. And then… I stopped over the word “_GPRMCterm” and the penny dropped.

I’m currently working with GNS701, a GPS+GLONASS device. The thing is that when it receives GPS data, it outputs some $GP— frames; when it receives GLONASS data, it outputs some GL— frames; and when it combines both, it outputs some GN— frames. Therefore, you can have both GPGSV and GLGSV frames printed, or GNRMC instead of GPRMC.

That last one case gave me a hard time. When the RMC frame outputted was the GPS RMC frame, things went reasonably well, as the lib was able to parse it with the encode function. But as soon as a better GPS/GLONASS signal was received, GNRMC frame was obtained. Thus, no further encoding was done.

I fixed it defining GNRMC header in TinyGPSPlus.cpp

#define _GPRMCterm “GPRMC”
#define _GNRMCterm “GNRMC” //ADDED!!

and matching GNRMC frames to GPRMC parsing (this is a bit twisted, bad practice, I know, but it works for GNRMC frame by now) in line 212

if (!strcmp(term, _GPRMCterm) || !strcmp(term, _GNRMCterm)) //MODIFIED!!
curSentenceType = GPS_SENTENCE_GPRMC;

Adding GPS/GLONASS support should be quite easy. Just needs defining the headers and some extra clauses in switch-case structures (and things like that). So maybe, it’s an interesting feature to include in a new lib version release. I volunteer to help. Please, contact me if so.

Regards,
Juan

thsnks for the great software
Just one question/ remark
It would be great if minute and seconds are formatted 00-59
instead of
Serial.println(gps.time.minute()); // Minute (0-59) (u8)
Serial.println(gps.time.second()); // Second (0-59) (u8)

Is there a simple code to achieve this?

Hi Mikal,

Thanks for the reply. I’ll give it a try!

I also wanted to know if there’s a way to turn the gps off thru the software alone?
My up501 gps module is connected directly to the 5V pin on the arduino mega and i want it to turn on once every 15 minutes, get valid data, and than turn off again. Is that possible by code?

Thank you

Hi Mikal,

Thanks for the excellent TinyGPSplus library ! Just wondered if there is a feature to do a rolling average of the position latitude and longitude, over a specified number of readings to get a stable position. The number of readings could be variable to either speed up or slow down the response. Thanks!

Is it also possible to use the tinyGPS++ with hardware serial port?
and how?

Thanks for the reply. I tried to implement a rolling/ smoothing code, but it seems that I can’t pick up the data that the TinyGPS++ extracts.

For example (based on Arduino smoothing example):

TinyGPSCustom rawlat (gps, “GPGGA”, 2); // extract raw Lat
.
.
.
void loop() {

total= total – readings[readIndex]; // subtract the last reading:

readings[readIndex] = rawlat; //read in extracted rawlat reading = numReadings) // if we’re at the end of the array…

readIndex = 0; // …wrap around to the beginning:

average = total / numReadings; // calculate the average:

Serial.println(average); // print the average

So trying to use rawlat doesn’t work ! Compilation error. Any suggestions/ help much appreciated!! Many thanks!

Thought you would like to be aware of an open source marine data
infrastructure (NMEA etc.) consortium that is coalescing on Github/google groups.

The base website is http://www.SignalK.com . A good
article from Bill Bishop on Panbo: http://www.panbo.com/archives/2014/11/signal_k_a_true_game_changer_.html

Some of the conversation on google groups is focused on navigation and
crowdsourced data and your expertise at fiddling and inventiveness suggest to me you might be able (and willing) to contribute to the conversation.

Hi Mikal..Thank you for your great work.
I’m runing your library in a NEOV2 Gps like this one

http://www.ebay.com/itm/Ublox-NEO-6M-V2-GPS-Module-Aircraft-Flight-Controller-For-Arduino-MWC-IMU-APM2-/321598638877?pt=LH_DefaultDomain_2&hash=item4ae0c5cb1d

but i’m taking Checksum fail errors..
4 OR 5 in every loop when runing the FullExample.

Any idea why ?

Thank you once again.

Mikal – Just wanted to thank you for all your effort on this. The TinyGPS library was great, but I think you’ve managed to make it better with TinyGPS++! I’m using it on an E-Traxx based robot and it works great. Thank you again.

Mikal,

Thanks for the previous reply. I have another question. I am trying to get the GPGSV satellite data using TinyGPSCustom objects. There are usually multiple sentences starting with $GPGSV depending on the number of satellites. I cannot read each sentence individually with my custom objects.
TinyGPSCustom messageNumber1(gps, “GPGSV”, 2);
TinyGPSCustom messageNumber2(gps, “GPGSV”, 2);
TinyGPSCustom messageNumber3(gps, “GPGSV”, 2);

All I get is the last sentence value every time. For example, if there are 3 GPGSV sentences, I get 3 each time instead of 1, 2, 3. I am using the second parameter for now as I am just trying to get the sentences separated so I can read them individually. My goal is to create a visual representation of where the satellites are in the sky using the elevation and azimuth data from these sentences (like the view in this link http://www.ka2ddo.org/ka2ddo/YAACdocs/viewgps.html). Any help would be greatly appreciated. Thanks again!

Arion

Hey Mikal,

Thanks for sharing the Library. I have a question about the course_to feature of the TinyGPS, sometimes it gives me the right degrees, and sometimes it doesn’t. Any inputs as to why this happens?

Regards

In one comment it was said that a Due or processor which can take advantage of the higher precision of 64-bit “double” floating-point is needed for TinyGPS+. Were you refering to hard or soft float? Im only asking because im not seeing any mention of an fpu in these arduino chips. Im interested in using this on a mips based soc but knowing if this is hard or soft float is important. Thank you ever so much

Craig

@Mikal and @Chris, did you ever figure out how to use it with the uBlox LEA?

Thanks!

Hi,
i try to take latitude, longitude, altitude and satellites number but for the 2 last this doesn’t work ….
the values are at 0 for altitude and satellites….
i have an arduino mega 2560 with a GPS U-Blox-7N
i have already imported the TinyGPSPlus in my arduino
this is my code :

#include
#include

static const int RXPin = 12, TXPin = 11;
static const uint32_t GPSBaud = 9600;

// The TinyGPS++ object
TinyGPSPlus gps;

// The serial connection to the GPS device
SoftwareSerial ss(RXPin, TXPin);

void setup()
{
Serial.begin(115200);
ss.begin(GPSBaud);
}

void loop()
{
while (ss.available() > 0)
if (gps.encode(ss.read()))
displayInfo();

if (millis() > 5000 && gps.charsProcessed() < 10)
{
Serial.println(F("No GPS detected: check wiring."));
while(true);
}
}

void displayInfo()
{

if (gps.location.isValid())
{
Serial.print(F("Location: "));
Serial.print(gps.location.lat(), 6);
Serial.print(F(","));
Serial.print(gps.location.lng(), 6);
Serial.print(F(","));
Serial.print(F("Altitude: "));
Serial.println(gps.altitude.meters());
Serial.print(F(","));
Serial.print(F("Satellites: "));
Serial.print(gps.satellites.value());
}
else
{
Serial.print(F("INVALID"));
}

Serial.println();
}

Hi Mikal,

I had a GPS module GP 635T connected to Arduino Uno on pin 3,2.

I used the following program:
[...]

I works perfectly when I walk.
But it doesn't work when I tried to test it in the car.

Any Recommend?

I am trying out the new library TinyGPS++ for a telemetry project, and I have begun with “BasicExample.” I wanted to see what would trigger errors, so tried changing one character at a time in various gpsStream fields, but I never got the “INVALID” msg; the only effect was that the string wouldn’t print. I realize a single character change would generate a checksum error, but that isn’t an error case in this demo… so what would be a printable string but an INVALID time for example?

Also, is there a configuration option to parse the msg but ignore the CRC?

Hi Mikal,
I am not sure, but the validity of custom sentence is always true?
$IIMWV,338.0,R,044.0,M,V*21 flags void.

TinyGPSCustom wind_dir(gps, “IIMWV”, 1);
TinyGPSCustom wind_speed(gps, “IIMWV”, 3);

(wind_speed.isValid()) is always ok.
Now i handle it as custom field itself.
TinyGPSCustom wind_valid(gps, “IIMWV”, 5);

Upps, found it in the for me not relevant “Establishing a fix” Section (Because i use no GPS)

For built-in (non-custom) objects, the NMEA sentences must self-report themselves as valid. That is, 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 the position and altitude information is discarded (though time and date are retained).

But Maybe this could be configurable too..?

Ni Mikal,
I need a clarification :
Arduino Uno doubles and/or floats have an accuracy of 6 or 7 digits and many people say that this is generating a large error.

Do your library is doing something to alleviate the problem ?

Thanks a lot for sharing your knowledge on this !

Hi all

Does this work with 1.0.6 ?
I’ve tried quite many times to install library to the Arduino libray folder and treid to copy .cpp and .h -files quity many place but it keep saying that “BasicExample:26: error: ‘TinyGPSPlus’ has not been declared”

BR
TommiP

Question. What’s the best way to determine that GPS has a fix with this code? I like the interface better with this, but the Adafruit GPS includes a fix variable that can be checked which allows me to loop for a while until a fix is obtained. Is there a good mechanism to understand when a fix is obtained?

Thanks, this is really great stuff.

Thanks for all the hard work… I’ve managed to develop an autopilot for my experimental aircraft (Thorp T-18) using your library.

I’m using an arduino due and it controls my trim tabs.. It works great but without your lib I would not have had it perfected to full navigation.. It would have followed only a compass.

Now it take gps data from hard wired neo 6m and my Android tablet/cell phone via bluetooth as well Lowrance GPS…

Thanks again!

Hi,Mikal..
I’m using an ATMEGA board with the gps on Serial1. I’m updating once a week a DS3231 clock, but there’s a strange problem. When the update occurs, the date and time transferred in the DS3231 are the ones from the last reset of the entire board, instead the actual ones.I’m using the isValid query before writing the DS3231.How can I flush the buffer after a reading so to get reals date and time or which function to use from GPS++ ?
Cheers,
Costin

hi mikal,
thanks for your great library!
i’m using it with an u-blox neo-6m module and it works, BUT
i dont get the GPGGA information like sats, hdop and altitude…

if i’m using a terminal program with the gps module directly, i get all information from $GPGSV, $GPGLL, $GPRMC, $GPVTG, %GPGGA and $GPGSA.

my baudrate is 9600. any suggestions?
thanks!