Sam Hetchler
Published © GPL3+

LinkIt ONE RTC Example Code

I made a complete example for anyone else out there who wants to use the LinkIt’s onboard RTC.

IntermediateProtip1,499
LinkIt ONE RTC Example Code

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Code

Code

C/C++
#include
#include

datetimeInfo t;
unsigned int rtc;
int gps_on=0; //This is used to check if the GPS needs to be turned off

void setup() {
  Serial.begin(115200);
}

void loop() {
  LDateTime.getTime(&t);
  LDateTime.getRtc(&rtc);
  Serial.print("Current GMT: ");
  Serial.print(t.mon);
  Serial.print("/");
  Serial.print(t.day);
  Serial.print("/");
  Serial.print(t.year);
  Serial.print(" ");
  Serial.print(t.hour);
  Serial.print(":");
  Serial.print(t.min);
  Serial.print(":");
  Serial.print(t.sec);
  Serial.print(" Seconds since 1/1/1970 GMT: ");
  Serial.println(rtc);
  
  //Turning on the GPS syncs up the RTC with the GPS time.
  //If the battery is pulled, the RTC goes back a couple years.
  //Turning on the GPS syncs up the RTC with the GPS time.
  //If the GPS is needed, t.year will be 2004. This will start this loop.
  if ((gps_on != 1) && (t.year < 2010))
  {
    Serial.println("Using GPS to sync GMT. Please wait...");
    LGPS.powerOn();
    gps_on = 1;
  }

  //If the GPS has synced the RTC, the year will be 2015 or greater.
  if ((gps_on == 1) && (t.year >= 2015))
  {
    LGPS.powerOff();
    Serial.println("Synced! Turning off GPS. Please wait...");
    gps_on = 0;
  }

  //Wait one second before getting new time.
  delay(1000);
}

Credits

Sam Hetchler

Sam Hetchler

10 projects • 34 followers
I am a tinkerer, developer, and concept hacker. I find it fun to push the boundaries of what's possible.

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