I am just at the start of a project to make a GPS_SD data logger, using the Firewing GPS shield on an Osepp Arduino Uno. I am fairly new to this stuff, and only have an intermediate understanding of C programming. All I'm trying to do is log basic GPS location to a *.csv file using one of the NMEA protocols, (most likely the $GPRMC protocol, or maybe the $GPGGA), but I'm not sure how to limit the type and speed of NMEA sentences using the Arduino IDE code. Ideally, I would have just a single NMEA sentence showing the date & time, lat. & long., and possibly the speed and direction of travel being logged, and new data being appended to the log once every 10 seconds or so. I am pretty sure I can write the code to pick the data I want out of a string, if that data string repeated on the same number of lines forever, but from the data I'm getting on the Serial monitor, none of the lines repeat like that consistently. I found a document from GlobalTop showing most of the PMTK command packets for the GPS+ GNS-g9 chip, but as I mentioned before, I am unsure of how to proceed. The Arduino code I found on the GPS_SD Shield browse on the Firewing.info web site is included below, and as you can see, it is very simple. I have also included a bit of the Serial Monitor output. Any help, or even a point in the right direction would be appreciated. Thanks in advance!
- Code: Select all
#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3); // RX, TX
int powerpin = 4;
int rxpin = 3;
int txpin = 2;
void setup()
{
pinMode(powerpin, OUTPUT);
digitalWrite(powerpin, HIGH);
Serial.begin(19200);
mySerial.begin(9600);
Serial.println("Waiting for GPS data...");
}
// loop forever
void loop()
{
if (mySerial.available())
Serial.write(mySerial.read());
}
Waiting for GPS data...
$PMTK011,MTKGPS*08
$PMTK010,001*2E
$PMTK011,MTKGPS*08
$PMTK010,002*2D
$GPGGA,235315.553,,,,,0,0,,,M,,M,,*48
$GPGSA,A,1,,,,,,,,,,,,,,,*1E
$GPRMC,235315.553,V,,,,,0.63,254.78,221113,,,N*46
$GPVTG,254.78,T,,M,0.63,N,1.17,K,N*3C
$GPGGA,235315.695,4952.9497,N,11929.5381,W,1,5,3.19,350.5,M,-16.0,M,,*64
$GPGSA,A,3,22,18,27,24,06,,,,,,,,3.32,3.19,0.91*0F
$GPRMC,235315.695,A,4952.9497,N,11929.5381,W,0.9,23.42211,,A*0
$PVG,5.24T,M0.8,,182K,*5
$GPGGA,235316.695,4952.9396,N,11929.5504,W,1,5,3.19,350.5,M,-16.0,M,,*6A
$GPGSA,A,3,22,18,27,24,06,,,,,,,,3.31,3.19,0.91*0C
$GPRMC,235316.695,A,4952.9396,N,11929.5504,W,0.6,24.9,211,,A*9
$GVT,84.9T,M,.6,,117K,*3
$GPGGA,235317.695,4952.9408,N,11929.5517,W,1,7,2.47,350.5,M,-16.0,M,,*61
$GNGSA,A,3,22,18,27,24,06,,,,,,,,2.63,2.47,0.91*1E
$GNGSA,A,3,71,73,,,,,,,,,,,2.63,2.47,0.91*10
$NRC,351765,,492948,,199.51,W0.13535,2113,,*69
$PTG35.5,T,M091N,.6,KA3B
$GPGGA,235319.000,4952.9423,N,11929.5522,W,1,8,2.19,350.5,M,-16.0,M,,*6E
$GNGSA,A,3,22,18,27,24,06,,,,,,,,2.36,2.19,0.89*1C
$GNGSA,A,3,87,71,73,,,,,,,,,,2.36,2.19,0.89*1D
$GGS,41,3227207,2,4,5,81,1,3,24,183,06,3*C
$GGV,,2131,2,35,272622,3,4,5,5430032,27,70
$PGV4,,1,0,1,1725211013,,10931,,2,9,6,*8
GGS,,413280333,*5
$GGV,,1097,6930,875320,5,1,2,5630883,37,67
$LGV,,,0,7,2,0127652026,2,0,9,26,8,1,88*6
GLSV3,,9,7,9,28*D
$GRM,2539000A492.42,N1129522W,.4,39972211,,A*F
$PVG,4997T,M1.4,,211K,*B
$GPGGA,235320.000,4952.9424,N,11929.5519,W,1,9,1.60,350.5,M,-16.0,M,,*67
$GNGSA,A,3,22,18,27,24,06,,,,,,,,1.83,1.60,0.89*1C
$GNGSA,A,3,87,71,73,86,,,,,,,,,1.83,1.60,0.89*1
GNMC2330.00A,95.924N1129559W,.9038.9,211,,,*2
$GVT,38.9,,M,.9,N167K,*3
$GPGGA,235321.000,4952.9418,N,11929.5510,W,1,9,1.60,350.5,M,-16.0,M,,*60
$GNGSA,A,3,22,18,27,24,06,,,,,,,,1.83,1.60,0.89*1C
$GNGSA,A,3,87,71,73,86,,,,,,,,,1.83,1.60,0.89*1
GNMC2531.00A,95.41,N1129550,,.7130.2,2113,,*D
$GVG,4072T,M,.7,N1.1K,*3
$GPGGA,235322.000,4952.9403,N,11929.5496,W,1,10,1.22,350.5,M,-16.0,M,,*58
$GNGSA,A,3,22,18,27,24,06,,,,,,,,1.48,1.22,0.84*10
$GNGSA,A,3,87,71,80,73,86,,,,,,,,1.48,1.22,0.8417
$NMC2332.00,,95.903N,199.46,,03134.2,2113,,*6
$GVT,30.2,,,,.31N0.7,,A3F
$GPGGA,235323.000,4952.9419,N,11929.5510,W,1,10,1.22,350.5,M,-16.0,M,,*5D
$GNGSA,A,3,22,18,27,24,06,,,,,,,,1.48,1.22,0.84*10
$GNGSA,A,3,87,71,80,73,86,,,,,,,,1.48,1.22,0.8*17
GNMC2333.00,,95.919N,199550,,00930.2,2113,,*1
$GVT,30.2,,M,.0,N0.6K,*3
$GPGGA,235324.000,4952.9434,N,11929.5526,W,1,10,1.22,350.4,M,-16.0,M,,*51
$GNGSA,A,3,22,18,27,24,06,,,,,,,,1.48,1.22,0.84*10
$GNGSA,A,3,87,71,80,73,86,,,,,,,,1.48,1.22,0.8*17
GPSV4,,4,2,2,7628146518,193926,,83508,3*7
GGS,42,4,1,1,6,3,1,2,35,2,2,24,9,42505,3*7
GPS,4,,4,3,3,3,,0,9,172,211,19,010,31,*6
$PGV,,4143,0,27,280,37,79
$LGV3,,0,7,6,39,8,5,20,8,1,2,5,2,8,3,17*62
GLSV3,,9,7,7,8125652026,1,019,2,3,8,1,18,4*F
$LGV,,309740,18,5D
GNMC2332.00,,95.934N,199556,,01234.7,2113,,*6
$GPT,30.2,,M,01,N0.2,,A3C
$GPGGA,235325.000,4952.9438,N,11929.5531,W,1,11,1.10,350.4,M,-16.0,M,,*5A
$GNGSA,A,3,22,18,27,24,06,,,,,,,,1.37,1.10,0.81*1C
$GNGSA,A,3,87,71,72,80,73,86,,,,,,,1.37,1.10,0811E
$NRC2332.00,,45.938,,199551,,02534.7,2113,,*6
GVTG34.2,,,,02,N0.6,,A3A
$GPGGA,235326.000,4952.9444,N,11929.5537,W,1,11,1.10,350.4,M,-16.0,M,,*54
$GNGSA,A,3,22,18,27,24,06,,,,,,,,1.37,1.10,0.81*1C
$GNGSA,A,3,87,71,72,80,73,86,,,,,,,1.37,1.10,0.1*E
$NRC,352600,A452944,,192.53,W0.1,4.7,2113,,A60
GPVG34.7,T,,0.1N,.1,KA37
$GPGGA,235327.000,4952.9444,N,11929.5535,W,1,12,0.98,350.4,M,-16.0,M,,*55
$GNGSA,A,3,22,18,27,24,06,19,,,,,,,1.27,0.98,0.81*14
$GNGSA,A,3,87,71,72,80,73,86,,,,,,,1.27,0.98,.8*1
$GRM,2537.00A492944,N192.535W,.1,40722211,,A*7
$GVG,407,T,M0.5,,02,KA*E
