CODE
#include "U8glib.h"
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0);
//---------------------------------------------------------------------------
#include <SoftwareSerial.h>
#define rxPin 10
#define txPin 3 //unused
SoftwareSerial neogps(rxPin,txPin);
#include <TinyGPS++.h> //1.0.3
TinyGPSPlus gps;
//---------------------------------------------------------------------------
int x_max = 128; //OLED display width, in pixels
int y_max = 62; //OLED display width, in pixels
int x_center = x_max/2;
int y_center = y_max/2+10;
int arc = y_max/2;
int angle = 0;
//---------------------------------------------------------------------------
int needle_pos = 0;
u8g_uint_t xx = 0;
//---------------------------------------------------------------------------
//satellite logo
#define sat_logo_width 20
#define sat_logo_height 20
const unsigned char sat_logo[] = {
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
};
//---------------------------------------------------------------------------
//Program variables
double lat;
double lng;
//int day, month, year;
String hour, minute;
int second;
int num_sat, speed;
String heading;
/*******************************************************************************************
* gauge function
* dispay gauge and other gps data on oled
*******************************************************************************************/
void gauge(uint8_t angle) {
//fonts: u8g_font_chikita - u8g_font_04b_03br
// u8g_font_orgv01 - u8g_font_freedoomr10r
u8g.setFont(u8g_font_chikita);
//---------------------------------------------------------------------------
// draw border of the gauge
u8g.drawCircle(x_center,y_center,arc+6, U8G_DRAW_UPPER_RIGHT);
u8g.drawCircle(x_center,y_center,arc+4, U8G_DRAW_UPPER_RIGHT);
u8g.drawCircle(x_center,y_center,arc+6, U8G_DRAW_UPPER_LEFT);
u8g.drawCircle(x_center,y_center,arc+4, U8G_DRAW_UPPER_LEFT);
//---------------------------------------------------------------------------
// show gauge values
u8g.drawStr(20, 42, "0");
u8g.drawStr(18, 29, "25");
u8g.drawStr(28, 14, "50");
u8g.drawStr(60, 14, "100");
u8g.drawStr(91, 14, "150");
u8g.drawStr(101, 29, "175");
u8g.drawStr(105, 42, "200");
//---------------------------------------------------------------------------
// show gauge label
u8g.setPrintPos(54,25);
u8g.print("km/h");
u8g.setPrintPos(50,32);
u8g.print("SPEED");
//---------------------------------------------------------------------------
// draw the needle
float x1=sin(2*angle*2*3.14/360);
float y1=cos(2*angle*2*3.14/360);
u8g.drawLine(x_center, y_center, x_center+arc*x1, y_center-arc*y1);
u8g.drawDisc(x_center, y_center, 5, U8G_DRAW_UPPER_LEFT);
u8g.drawDisc(x_center, y_center, 5, U8G_DRAW_UPPER_RIGHT);
//---------------------------------------------------------------------------
//TOP LEFT: draw satellite logo and number of satellites
u8g.drawXBM(5, 0, sat_logo_width, sat_logo_height, sat_logo);
u8g.setPrintPos(22, 5);
u8g.print(num_sat, 5);
//---------------------------------------------------------------------------
//TOP RIGHT: Display direction
u8g.setPrintPos(110, 5);
u8g.print(heading);
//---------------------------------------------------------------------------
//Display latitude and longitude
u8g.setPrintPos(4, 55);
u8g.print(lat, 4);
u8g.setPrintPos(4, 62);
u8g.print(lng, 4);
//---------------------------------------------------------------------------
//Display time
u8g.setFont(u8g_font_freedoomr10r);
u8g.setPrintPos(90, 65);
u8g.print(hour);
if(second%2 == 0)
{u8g.drawStr(104, 65, ":");}
else
{u8g.drawStr(104, 65, " ");}
u8g.setPrintPos(111, 65);
u8g.print(minute);
//u8g.drawStr(90, 65, "00:00");
//---------------------------------------------------------------------------
// Show Speed and align its position
u8g.setFont(u8g_font_profont22);
u8g.setPrintPos(54,60);
if (speed<10){
u8g.print("0");
}
if (speed>99) {
u8g.setPrintPos(47,60);
}
u8g.print(speed);
//---------------------------------------------------------------------------
}
/*******************************************************************************************
* gauge function
* dispay gauge and other gps data on oled
*******************************************************************************************/
int i = 200;
void setup(void) {
Serial.begin(9600);
neogps.begin(9600);
u8g.setFont(u8g_font_chikita);
u8g.setColorIndex(1);
}
/*******************************************************************************************
* gauge function
* dispay gauge and other gps data on oled
*******************************************************************************************/
void loop(void){
//----------------------------------------------------------
Read_GPS();
//----------------------------------------------------------
needle_pos = map(speed,0,200,0,90); //SET NEEDLE
// show needle and dial
xx = needle_pos;
if (xx<45)
{xx=xx+135;}
else
{xx=xx-45;}
//----------------------------------------------------------
//Display Data on Oled
{
u8g.firstPage();
do {
gauge(xx);
}
while( u8g.nextPage() );
}
//----------------------------------------------------------
}
void Read_GPS(){
//------------------------------------------------------------------
boolean newData = false;
for (unsigned long start = millis(); millis() - start < 1000;)
{
while (neogps.available())
{
if (gps.encode(neogps.read()))
{
newData = true;
break;
}
}
}
//------------------------------------------------------------------
//If newData is true
if(newData == true){
newData = false;
Get_GPS();
}
else {
//no data
}
}
void Get_GPS(){
num_sat = gps.satellites.value();
if (gps.location.isValid() == 1) {
speed = gps.speed.kmph();
//Serial.print("Speed: ");Serial.println(gps_speed);
lat = gps.location.lat();
//Serial.print("lat: ");Serial.println(lat);
lng = gps.location.lng();
//Serial.print("lng: ");Serial.println(lng);
heading = gps.cardinal(gps.course.value());
//Serial.print("heading: ");Serial.println(heading);
}
if (gps.time.isValid()){
hour = String(gps.time.hour());
hour = (hour.length() == 1) ? "0"+hour : hour;
minute = String(gps.time.minute());
minute= (minute.length() == 1) ? "0"+minute : minute;
second = gps.time.second();
}
}