GPS Speedometer

#include "U8glib.h"
U8GLIB_SSD1351_128X128_332 u8g(13, 11, 8, 9, 7); // Arduino UNO: SW SPI Com: SCK = 13, MOSI = 11, CS = 8, DC = 9, RESET = 7



#define u8g_logo_sat_width 20
#define u8g_logo_sat_height 20

//satellite logo
const unsigned char u8g_logo_sat[] = {
  0x00, 0x01, 0x00, 0x80, 0x07, 0x00, 0xc0, 0x06, 0x00, 0x60, 0x30, 0x00,
  0x60, 0x78, 0x00, 0xc0, 0xfc, 0x00, 0x00, 0xfe, 0x01, 0x00, 0xff, 0x01,
  0x80, 0xff, 0x00, 0xc0, 0x7f, 0x06, 0xc0, 0x3f, 0x06, 0x80, 0x1f, 0x0c,
  0x80, 0x4f, 0x06, 0x19, 0xc6, 0x03, 0x1b, 0x80, 0x01, 0x73, 0x00, 0x00,
  0x66, 0x00, 0x00, 0x0e, 0x00, 0x00, 0x3c, 0x00, 0x00, 0x70, 0x00, 0x00
};

// The serial connection to the GPS device
#include <SoftwareSerial.h>
static const int RXPin = 10, TXPin = 15;
static const uint32_t GPSBaud = 9600;
SoftwareSerial ss(RXPin, TXPin);

//GPS Library
#include <TinyGPS++.h>
TinyGPSPlus gps;

//Program variables
double Lat;
double Long;
//int day, month, year;
//int hour, minute, second;

int num_sat, gps_speed;
String heading;


const int ledCount = 10;    // the number of LEDs in the bar graph

int ledPins[] = {
  2, 3, 4, 5, 6, 14, A5, A4, A3, A2
};   // an array of pin numbers to which LEDs are attached



void setup() {

  ss.begin(GPSBaud);

  // assign default color value
  if ( u8g.getMode() == U8G_MODE_R3G3B2 ) {
    u8g.setColorIndex(255);     // white
  }

  //Define ledpins as OUTPUT's
  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    pinMode(ledPins[thisLed], OUTPUT);
  }


}

void loop() {

  Get_GPS(); //Get GPS data


  Led_Bar();//Adjust the LED bar


  //Display info in the OLED
  u8g.firstPage();
  do {
    print_speed();
  } while ( u8g.nextPage() );




}

void print_speed() {

  u8g.setFont(u8g_font_helvR24r);
  u8g.setPrintPos(2, 70);

  u8g.print(gps_speed , DEC);
  u8g.setPrintPos(60, 70);
  u8g.print("km/h");


  u8g.setFont(u8g_font_unifont);
  u8g.setPrintPos(85, 15);
  u8g.print( num_sat, 5);


  u8g.setFont(u8g_font_unifont);
  u8g.setPrintPos(15, 100);
  u8g.print("Lat:");

  u8g.setPrintPos(50, 100);
  u8g.print( Lat, 6);


  u8g.setPrintPos(10, 120);
  u8g.print("Long:");

  u8g.setPrintPos(50, 120);
  u8g.print( Long, 6);



  u8g.setFont(u8g_font_unifont);

  u8g.setPrintPos(0, 15);
  u8g.print( heading);


  u8g.drawXBM(108, 0, u8g_logo_sat_width, u8g_logo_sat_height, u8g_logo_sat);


}

// This custom version of delay() ensures that the gps object
// is being "fed".
static void smartDelay(unsigned long ms)
{
  unsigned long start = millis();
  do
  {
    while (ss.available())
      gps.encode(ss.read());
  } while (millis() - start < ms);
}


void Get_GPS()
{


  num_sat = gps.satellites.value();

  if (gps.location.isValid() == 1) {

    Lat = gps.location.lat();
    Long = gps.location.lng();


    gps_speed = gps.speed.kmph();

    heading = gps.cardinal(gps.course.value());
  }



  /*
    if (gps.date.isValid())
    {
      day = gps.date.day();
      month = gps.date.month();
      year = gps.date.year();
    }

    if (gps.time.isValid())
    {

      hour = gps.time.hour();
      minute = gps.time.minute();
      second = gps.time.second();
    }

  */

  smartDelay(1000);


  if (millis() > 5000 && gps.charsProcessed() < 10)
  {
    // Serial.println(F("No GPS detected: check wiring."));

  }



}

void Led_Bar()
{

  int ledLevel = map(gps_speed, 0, 190, 0, ledCount);

  for (int thisLed = 0; thisLed < ledCount; thisLed++) {
    // if the array element's index is less than ledLevel,
    // turn the pin for this element on:
    if (thisLed < ledLevel) {
      digitalWrite(ledPins[thisLed], HIGH);
    } else { // turn off all pins higher than the ledLevel:
      digitalWrite(ledPins[thisLed], LOW);
    }
  }
}