- Sat Sep 01, 2012 5:26 pm
#149076
ok so i figured out that some libraries were not where they should be got that sorted out, then it compiled and uploaded.The program runs, writes data to the card. Now the problem is that while its writing the correct latitude in relation to my location, the longitude its reporting is off the actual location by 11 miles. However if I load and run the tinygps example sketch it then reports bot lat and lon correctly so I figure the problem must be in my code but Im stumped as to what it is. Any ideas?
heres the code Im running:
/*
-----------------------------
Written by Jonnyboy323
Version 1.0
GPS Data Logger
10/17/11
-----------------------------
*/
//Add the Mikal Hart Libraries
#include <SoftwareSerial.h>
#include <TinyGPS.h>
//Add the SdFat Libraries
#include <SdFat.h>
#include <SdFatUtil.h>
#include <ctype.h>
//Create the variables to be used by SdFat Library
Sd2Card card;
SdVolume volume;
SdFile root;
SdFile file;
#define BUFFSIZE 65
char buffer[BUFFSIZE]; //This will be a data buffer for writing contents to the file.
char in_char=0;
char filename[]="trip.txt";
//Intialize TinyGPS and SoftwareSerial
TinyGPS gps;
SoftwareSerial nss(3, 2);
//Intialize GPS variables
long lat, lon;
float flat, flon, fspeed, falt, fcourse;
unsigned long age, date, time, chars;
int year;
byte month, day, hour, minute, second, hundredths;
unsigned short sentences, failed;
bool newdata = false;
bool feedgps();
void setup()
{
nss.begin(4800); //GPS's Buad Rate
pinMode(0, INPUT);
pinMode(1, OUTPUT);
pinMode(10, OUTPUT);
pinMode(13, OUTPUT); //LED Pin
digitalWrite(13, LOW); // Ensure LED starts as off
card.init(); //Initialize the SD card and configure the I/O pins.
volume.init(card); //Initialize a volume on the SD card.
root.openRoot(volume); //Open the root directory in the volume.
//Create file with defined filename
file.open(root, filename, O_CREAT | O_APPEND | O_WRITE); //Open or create the file 'name' in 'root' for writing to the end of the file
file.print("year,month,day,hour,minute,seconds,latitude,longitude,altitude(ft),speed(mph),course\n"); //Write the header array to the end of the file.
file.close(); //Close the file.
// flash LED 5 times when setup is finished
for (int i=0; i<4; i++){
digitalWrite(13, HIGH); // set the LED on
delay(1000); // wait for a second
digitalWrite(13, LOW); // set the LED off
}
}
void loop()
{
bool newdata = false; // check if data is coming in
if (feedgps())
newdata = true;
if (newdata)
{
//Pull gps data
gps.f_get_position(&flat, &flon, &age);
feedgps(); //used to keep gps "awake"
gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age);
feedgps();
falt = gps.f_altitude();
fspeed = gps.f_speed_mph();
fcourse = gps.f_course();
feedgps();
//Break up float values into whole numbers(var) and decimals(var1) to be added to data
int flat1 = (flat - (int)flat) * 10000;
int flon1 = (flon - (int)flon) * 100000;
int alt1 = 0;
if (falt >= 10000000.00){ //when gps cant get altitude
falt = 0; //set to 0
}else{
falt = falt * 0.032808399; //cm to feet
alt1 = (falt - (int)falt) * 10;
}
int fspeed1 = (fspeed - (int)fspeed) * 10;
int fcourse1 = (fcourse - (int)fcourse) * 10;
//Create then write the char array "buffer" to the end of the file
file.open(root, filename, O_WRITE | O_APPEND); //Open the file in write mode and append the data to the end of the file.
sprintf(buffer, "%d,%d,%d,%d,%d,%d,%0d.%d,%0d.%d,%0d.%d,%0d.%d,%0d.%d\n", year,month,day,hour,minute,second,(int)flat,abs(flat1),(int)flon,abs(flon1),(int)falt,abs(alt1),(int)fspeed,abs(fspeed1),(int)fcourse,abs(fcourse1));
file.print(buffer); //Write the 'contents' array to the end of the file.
file.close(); //Close the file
//flash LED
digitalWrite(13, HIGH); // set the LED on
delay(500);
digitalWrite(13, LOW); // set the LED off
delay(5000); // wait 5 sec before writing next data point
}
}
bool feedgps()
{
while (nss.available())
{
if (gps.encode(nss.read()))
return true;
}
return false;
}
