Data Logging Stops After Losing GPS Signal

Projects Programming
24

JMP91:
Additionally, I also want to have a red LED turn on when the GPS does NOT have a fix, and a green LED turn on when it DOES have a fix. Any ideas for what function to use for that?

Well honestly I'd like to see the whole program again because like michinyon I have my doubts you're doing everything 100% correctly, but if you're wondering how to do the Red/Green LED fix I was taking a break from my work and did this:

const byte GREEN_LED_PIN    = 99;
const byte RED_LED_PIN      = 99;
const long TIMEOUT_INTERVAL = 10000L;

unsigned long lastUpdated = 0;

void setup() {
   pinMode(GREEN_LED_PIN, OUTPUT);
   pinMode(RED_LED_PIN,   OUTPUT);
   
   // Turn on the RED LED to indicate we have no fix yet
   digitalWrite(RED_LED_PIN,   HIGH);
   digitalWrite(GREEN_LED_PIN, LOW);
   
   [...]
}

void loop() {
  boolean isUpdated = false;

  // Read data from the serial port and all that good stuff here...
  [...]
  
  if (gps.location.isUpdated()) {
    [...]
    isUpdated = true;
  }
  
  if (gps.speed.isUpdated()) }
    [...]
    isUpdated = true;
  }
  
  [...]
  
  // Do we need to log data to the SD card?
  if (isUpdated) {
    // Handle the LED stuff first
    lastUpdated = millis();              // Keep track of last good update
	
    digitalWrite(GREEN_LED_PIN, HIGH);   // Green LED means we've got a fix
    digitalWrite(RED_LED_PIN,   LOW);    // Turn off the "no fix" LED
	
    // Write to SD card here
    [...]
  }
  else {
    // Been too long since we last got good data?
    if (millis() - lastUpdated > TIMEOUT_INTERVAL) {
      // Yes.  Indicate our displeasure
      digitalWrite(GREEN_LED_PIN, LOW);
      digitalWrite(RED_LED_PIN,   HIGH);
     }
  }
}

There is quite a bit omitted but I hope you get the idea.

Regards,

Brad
KF7FER