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Diffstat (limited to 'Time/Examples/TimeGPS/TimeGPS.pde')
-rw-r--r-- | Time/Examples/TimeGPS/TimeGPS.pde | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/Time/Examples/TimeGPS/TimeGPS.pde b/Time/Examples/TimeGPS/TimeGPS.pde new file mode 100644 index 0000000..1c7b25e --- /dev/null +++ b/Time/Examples/TimeGPS/TimeGPS.pde @@ -0,0 +1,82 @@ +/* + * TimeGPS.pde + * example code illustrating time synced from a GPS + * + */ + +#include <Time.h> +#include <TinyGPS.h> //http://arduiniana.org/libraries/TinyGPS/ +#include <NewSoftSerial.h> //http://arduiniana.org/libraries/newsoftserial/ +// GPS and NewSoftSerial libraries are the work of Mikal Hart + +TinyGPS gps; +NewSoftSerial serial_gps = NewSoftSerial(3, 2); // receive on pin 3 + +const int offset = 1; // offset hours from gps time (UTC) +time_t prevDisplay = 0; // when the digital clock was displayed + +void setup() +{ + Serial.begin(9600); + serial_gps.begin(4800); + Serial.println("Waiting for GPS time ... "); + setSyncProvider(gpsTimeSync); +} + +void loop() +{ + while (serial_gps.available()) + { + gps.encode(serial_gps.read()); // process gps messages + } + 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); +} + +time_t gpsTimeSync(){ + // returns time if avail from gps, else returns 0 + unsigned long fix_age = 0 ; + gps.get_datetime(NULL,NULL, &fix_age); + unsigned long time_since_last_fix; + if(fix_age < 1000) + return gpsTimeToArduinoTime(); // return time only if updated recently by gps + return 0; +} + +time_t gpsTimeToArduinoTime(){ + // returns time_t from gps date and time with the given offset hours + tmElements_t tm; + int year; + gps.crack_datetime(&year, &tm.Month, &tm.Day, &tm.Hour, &tm.Minute, &tm.Second, NULL, NULL); + tm.Year = year - 1970; + time_t time = makeTime(tm); + return time + (offset * SECS_PER_HOUR); +} |