88 lines
2.5 KiB
Arduino
88 lines
2.5 KiB
Arduino
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/*
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* TimeGPS.pde
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* example code illustrating time synced from a GPS
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*
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*/
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#include <TimeLib.h>
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#include <TinyGPS.h> // http://arduiniana.org/libraries/TinyGPS/
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#include <SoftwareSerial.h>
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// TinyGPS and SoftwareSerial libraries are the work of Mikal Hart
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SoftwareSerial SerialGPS = SoftwareSerial(10, 11); // receive on pin 10
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TinyGPS gps;
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// To use a hardware serial port, which is far more efficient than
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// SoftwareSerial, uncomment this line and remove SoftwareSerial
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//#define SerialGPS Serial1
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// Offset hours from gps time (UTC)
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const int offset = 1; // Central European Time
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//const int offset = -5; // Eastern Standard Time (USA)
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//const int offset = -4; // Eastern Daylight Time (USA)
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//const int offset = -8; // Pacific Standard Time (USA)
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//const int offset = -7; // Pacific Daylight Time (USA)
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// Ideally, it should be possible to learn the time zone
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// based on the GPS position data. However, that would
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// require a complex library, probably incorporating some
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// sort of database using Eric Muller's time zone shape
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// maps, at http://efele.net/maps/tz/
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time_t prevDisplay = 0; // when the digital clock was displayed
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void setup()
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{
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Serial.begin(9600);
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while (!Serial) ; // Needed for Leonardo only
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SerialGPS.begin(4800);
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Serial.println("Waiting for GPS time ... ");
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}
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void loop()
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{
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while (SerialGPS.available()) {
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if (gps.encode(SerialGPS.read())) { // process gps messages
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// when TinyGPS reports new data...
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unsigned long age;
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int Year;
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byte Month, Day, Hour, Minute, Second;
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gps.crack_datetime(&Year, &Month, &Day, &Hour, &Minute, &Second, NULL, &age);
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if (age < 500) {
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// set the Time to the latest GPS reading
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setTime(Hour, Minute, Second, Day, Month, Year);
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adjustTime(offset * SECS_PER_HOUR);
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}
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}
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}
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if (timeStatus()!= timeNotSet) {
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if (now() != prevDisplay) { //update the display only if the time has changed
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prevDisplay = now();
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digitalClockDisplay();
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}
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}
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}
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void digitalClockDisplay(){
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// digital clock display of the time
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Serial.print(hour());
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printDigits(minute());
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printDigits(second());
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Serial.print(" ");
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Serial.print(day());
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Serial.print(" ");
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Serial.print(month());
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Serial.print(" ");
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Serial.print(year());
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Serial.println();
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}
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void printDigits(int digits) {
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// utility function for digital clock display: prints preceding colon and leading 0
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Serial.print(":");
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if(digits < 10)
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Serial.print('0');
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Serial.print(digits);
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}
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