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	- Project: "Odometer Display"
	- Source Code NOT compiled for: Arduino Nano
	- Source Code created on: 2024-07-15 19:45:21

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
	/* creare un contachilometri gps */
/****** END SYSTEM REQUIREMENTS *****/

/****** DEFINITION OF LIBRARIES *****/
#include <Wire.h>
#include <Adafruit_SSD1306.h>  // https://github.com/stblassitude/Adafruit_SSD1306_Wemos_OLED.git
#include <U8g2_for_Adafruit_GFX.h>  // https://github.com/olikraus/U8g2_for_Adafruit_GFX
#include <TinyGPS++.h>  // GPS library

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);
void displayOdometer(float distance);

/***** DEFINITION OF I2C PINS *****/
const uint8_t display_SSD1306OledDisplay_I2C_PIN_SDA_A4 = A4;
const uint8_t display_SSD1306OledDisplay_I2C_PIN_SCL_A5 = A5;
const uint8_t display_SSD1306OledDisplay_I2C_SLAVE_ADDRESS = 0x3C; // 60 in decimal

/****** DEFINITION OF LIBRARIES CLASS INSTANCES*****/
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);
U8G2_FOR_ADAFRUIT_GFX u8g2_for_adafruit_gfx; // Create an instance of U8G2_FOR_ADAFRUIT_GFX
TinyGPSPlus gps;  // Create an instance of TinyGPSPlus

// Variables to store GPS data
float totalDistance = 0.0;
float lastLatitude = 0.0;
float lastLongitude = 0.0;

void setup(void)
{
  Serial.begin(9600); // Initialize serial communication for GPS
  display.begin(SSD1306_SWITCHCAPVCC, display_SSD1306OledDisplay_I2C_SLAVE_ADDRESS);
  u8g2_for_adafruit_gfx.begin(display);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("GPS Odometer");
  display.display();
  delay(2000);
}

void loop(void)
{
  while (Serial.available() > 0) {
    gps.encode(Serial.read());
    if (gps.location.isUpdated()) {
      float currentLatitude = gps.location.lat();
      float currentLongitude = gps.location.lng();
      if (lastLatitude != 0.0 && lastLongitude != 0.0) {
        float distance = TinyGPSPlus::distanceBetween(
          lastLatitude, lastLongitude,
          currentLatitude, currentLongitude
        );
        totalDistance += distance;
      }
      lastLatitude = currentLatitude;
      lastLongitude = currentLongitude;
      displayOdometer(totalDistance);
    }
  }
}

void displayOdometer(float distance) {
  display.clearDisplay();
  u8g2_for_adafruit_gfx.setFont(u8g2_font_helvR14_tf);
  u8g2_for_adafruit_gfx.setCursor(0,20);
  u8g2_for_adafruit_gfx.print("Distance:");
  u8g2_for_adafruit_gfx.setCursor(0,40);
  u8g2_for_adafruit_gfx.print(distance, 2);
  u8g2_for_adafruit_gfx.print(" meters");
  display.display();
}