I decided to make a clock that syncs to GPS time..
But, the GPS time i'm getting is accurate, it just appears not to be in my Time Zone, are all GPS time signals based on GMT or something else?...
EG, do i simply need to deduct/add from the time? or should the GPS give me my time zone?
Location: -34.85XXX6,138.61XXX9 Date/Time: 9/8/2014 05:51:07.00
it should be
Location: -34.85XXX6,138.61XXX9 Date/Time: 9/8/2014 15:23:07.00
(UTC + 9:30 for Adelaide, South Australia)
I don't want to add X amount of hours to find out tomorrow it changes, i have no idea about GPS time.
edit..
/*
* TimeGPS.pde
* example code illustrating time synced from a GPS
*
*/
#include <Time.h>
#include <TinyGPS.h> // http://arduiniana.org/libraries/TinyGPS/
#include <SoftwareSerial.h>
// TinyGPS and SoftwareSerial libraries are the work of Mikal Hart
SoftwareSerial SerialGPS = SoftwareSerial(A0, A1); // receive on pin 10
TinyGPS gps;
// To use a hardware serial port, which is far more efficient than
// SoftwareSerial, uncomment this line and remove SoftwareSerial
//#define SerialGPS Serial1
// Offset hours from gps time (UTC)
const int offset = 1; // Central European Time
//const int offset = -5; // Eastern Standard Time (USA)
//const int offset = -4; // Eastern Daylight Time (USA)
//const int offset = -8; // Pacific Standard Time (USA)
//const int offset = -7; // Pacific Daylight Time (USA)
// Ideally, it should be possible to learn the time zone
// based on the GPS position data. However, that would
// require a complex library, probably incorporating some
// sort of database using Eric Muller's time zone shape
// maps, at http://efele.net/maps/tz/
time_t prevDisplay = 0; // when the digital clock was displayed
const int UTC_offset = 9;
void setup()
{
Serial.begin(9600);
while (!Serial) ; // Needed for Leonardo only
SerialGPS.begin(9600);
Serial.println("Waiting for GPS time ... ");
}
void loop()
{
while (SerialGPS.available()) {
if (gps.encode(SerialGPS.read())) { // process gps messages
// when TinyGPS reports new data...
unsigned long age;
int Year;
byte Month, Day, Hour, Minute, Second;
gps.crack_datetime(&Year, &Month, &Day, &Hour, &Minute, &Second, NULL, &age);
if (age < 500) {
// set the Time to the latest GPS reading
setTime(Hour, Minute, Second, Day, Month, Year);
adjustTime((UTC_offset * SECS_PER_HOUR) + SECS_PER_HOUR/2);
}
}
}
if (timeStatus()!= timeNotSet) {
if (now() != prevDisplay) { //update the display only if the time has changed
prevDisplay = now();
digitalClockDisplay();
}
}
}
void digitalClockDisplay(){
// digital clock display of the time
Serial.print(hour());
printDigits(minute());
printDigits(second());
Serial.print(" ");
Serial.print(day());
Serial.print(" ");
Serial.print(month());
Serial.print(" ");
Serial.print(year());
Serial.println();
}
void printDigits(int digits) {
// utility function for digital clock display: prints preceding colon and leading 0
Serial.print(":");
if(digits < 10)
Serial.print('0');
Serial.print(digits);
}
used different code from the same person who wrote the other time lib.
Thanks! but this does the job 