Exen Mini Serial GPS Connection

exengpsserial.ino

#include <TinyGPS.h>


// Create our GPS Object
TinyGPS tracker;

// Hold the speed somewhere
float mph;

// How many satelites do we have in view?
int satelites;

// Variables will change:
int ledState = LOW;             // ledState used to set the LED

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;        // will store last time LED was updated

// constants won't change:
const long interval = 1000;           // interval at which to blink (milliseconds)

void setup() {
  SerialUSB.begin(9600);
  Serial.begin(9600);
  SerialUSB.println("Starting up...");
}

void loop() {
  // Read the Values from the GPS unit
  if (Serial.available() > 0) {
    SerialUSB.println("Reading Serial");
    int c = Serial.read();
    if (tracker.encode(c))
    {
      satelites = tracker.satellites();

      // Process what we've just found
      mph = tracker.f_speed_mph();
      SerialUSB.print("Current speed in MPH is ");
      SerialUSB.println(mph);
      SerialUSB.print("Current number of visible satelites is ");
      SerialUSB.println(tracker.satellites());
    } else {
      SerialUSB.println("Could not encode message");
    }
  }
  if (satelites > 0) {
    digitalWrite(8, HIGH);
  }
  else
  {
    unsigned long currentMillis = millis();

    if (currentMillis - previousMillis >= interval) {
      // save the last time you blinked the LED
      previousMillis = currentMillis;

      // if the LED is off turn it on and vice-versa:
      if (ledState == LOW) {
        ledState = HIGH;
      } else {
        ledState = LOW;
      }

      // set the LED with the ledState of the variable:
      digitalWrite(8, ledState);
    }
  }
}