// simple turbo boost gauge for Arduino, 128x64 OLED display and a potentiometer
//
// based on the "u8glib_progress_bar" project by urish - https://wokwi.com/arduino/projects/300867986768527882
//
// created by upir
// full-length youtube tutorial: https://youtu.be/JXmw1xOlBdk

// links for tools used for this project:
// WOWKI emulator: https://wokwi.com/
// Start project from urish: https://wokwi.com/arduino/projects/300867986768527882
// Photopea (online graphics editor): https://www.photopea.com/ 
// Gamer font: https://www.dafont.com/gamer-2.font?text=-1+2+3+4+5+6+7+8+TURBO+turbo+boost 
// Image2CPP tool: https://javl.github.io/image2cpp/
// Pressure sensor with Arduino: https://www.youtube.com/watch?v=MRNc7XUHBks
#include "U8glib.h"

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_NO_ACK | U8G_I2C_OPT_FAST); // Fast I2C / TWI

// '4', 128x64px
const unsigned char epd_PLUNDER [] PROGMEM = {
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};

const unsigned char epd_bitmap_HUD [] PROGMEM = {
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  0x00, 0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x0f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x1c, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x18, 0x78, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x31, 0xec, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x33, 0xcc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x33, 0xcc, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x31, 0x8c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x18, 0x18, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x1c, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x0f, 0xf0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0x03, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 
  0x00, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};

int FUEL_GAUGE = 0;
int ENGINE_TEMP = 0;
int SCREEN_BRIGHTNESS;

float voltage_vcc = 4.5;
float FUEL_GAUGE_RONE = 2000;
float ENGINE_TEMP_RONE = 2000;
float BRIGHTNESSPOT_RMAX = 250000;

//#define DEBUG

int BLACK_DIESEL = 5;
int NORMAL_DIESEL = 6;
int FUEL_SELECT = 7;

int FUEL_MAIN = LOW;
int FUEL_REAR = HIGH;
int TEMP_WARM_THRES = 500;
int FUEL_LOW_THRES = 100;

long WARMUP_PERIOD = -1;

int FUEL_LAST = -1;
unsigned long LAST_MILL = 0;
bool ALTERNATOR = false;

//Same as fuel gauge, we have 0-250k ohm resistor (=R2)
//250k = 512
//0k = 0
//returns value between 0 and 255
float BrightnessPot_Read(float reading) {
  return (reading) / (512.0) * 255.0;
}

//For fuel gauge we have a 0 - 190 Ohm resistor
//R_One is 2000 ohm
//Range: R2 = 190 ohm -> 1024
//       R2 = 0   ohm -> -> 0
float FUEL_GAUGE_Read(float reading) {
  #ifdef DEBUG
  //If in debug, 0 is 0, 1024 is 0.39 volt = 88
    reading *= (0.39 / voltage_vcc);
  #endif
  float voltage = reading / 1024.0 * voltage_vcc;
  float RTwo = voltage * FUEL_GAUGE_RONE / (voltage_vcc - voltage);

  RTwo = max(0, min(RTwo, 180.0));

  return RTwo / 180.0 * 1024;
}

float EngineTemp_Read(float reading) {
  //0    = 0C
  //1024 = 100C
#ifdef DEBUG
  //Vout = 0, when temp = 100C
  //Vin = 3.5 when temp = 0C
  reading *= (3.5/4.5);
#endif
  float v_out = reading / 1024.0 * voltage_vcc;
  float RTwo = v_out * ENGINE_TEMP_RONE / (voltage_vcc - v_out);

  float temperature = -127.1594 + (430322.1 - -127.1594)/(1.0 + pow(RTwo/2.6968959999999997e-17,0.1737623));
  temperature = max(0, min(temperature, 100.0));

  return temperature / 100.0 * 1024.0;
}

void setup() {
  Serial.begin(115200); // Any baud rate should work
  u8g.setColorIndex(1);  // set the color to white

  pinMode(A0, INPUT);
  pinMode(A1, INPUT);
  pinMode(A2, INPUT);
  pinMode(A3, INPUT);
  pinMode(A4, INPUT);
  pinMode(A5, INPUT);
  pinMode(FUEL_SELECT, INPUT);
  pinMode(NORMAL_DIESEL, OUTPUT);
  pinMode(BLACK_DIESEL, OUTPUT);
}


void loop() {
  u8g.firstPage();
  u8g.setFont(u8g_font_profont22);

  //Set the warmup
  if(WARMUP_PERIOD != -1 && millis() > WARMUP_PERIOD) {
    WARMUP_PERIOD = -2;
  }

  //Every 1 second
  if(LAST_MILL == 0 || millis() - LAST_MILL > 1000) {
    LAST_MILL = millis();
    ALTERNATOR =! ALTERNATOR;

    //Current fuel selected
    int curFuel = digitalRead(FUEL_SELECT);
    
    //If the fuel changed since last time
    if(FUEL_LAST != curFuel) {
      FUEL_LAST = curFuel;
      if(curFuel == FUEL_REAR) {
        //Set valve to black diesel
        digitalWrite(BLACK_DIESEL, HIGH);
        digitalWrite(NORMAL_DIESEL, LOW);
      } else if( curFuel == FUEL_MAIN) {
        //Set valve to normal diesel
        digitalWrite(BLACK_DIESEL, LOW);
        digitalWrite(NORMAL_DIESEL, HIGH);
      }
    }

    FUEL_GAUGE = FUEL_GAUGE_Read(analogRead(A1));
    ENGINE_TEMP = EngineTemp_Read(analogRead(A4));
    SCREEN_BRIGHTNESS = BrightnessPot_Read(analogRead(A5));

    if(WARMUP_PERIOD == -1) {
      if(FUEL_LAST == FUEL_REAR) {
        //45 seconds for BLACK diesel
        WARMUP_PERIOD = 45000;
      } else if(FUEL_LAST == FUEL_MAIN) {
        //Else 5 seconds
        WARMUP_PERIOD = 5000;
      }
    }
  }
  
  do {
    u8g.setColorIndex(1);//White

    //---------Print out bars----------
    //Rear fuel tank level
    bool drawWarmup = WARMUP_PERIOD > 0 && millis() < WARMUP_PERIOD;
    bool drawSwitchFuel = false;

    if(millis() < 2000) {
      u8g.drawBitmapP( 0, 0, 128/8, 64, epd_PLUNDER);
      continue;
    }

    if( FUEL_LAST == FUEL_MAIN &&
        millis() < 180000 && //Only first 3 minutes
        ENGINE_TEMP >= TEMP_WARM_THRES &&
        FUEL_GAUGE > FUEL_LOW_THRES
      ) {
          drawSwitchFuel = true;
    }
    
    //Flicker if fuel type is selected
    if( FUEL_LAST == FUEL_MAIN || //Always show if fuel is main
        FUEL_LAST == FUEL_REAR && ( (FUEL_GAUGE >= FUEL_LOW_THRES) || //Always show if enough fuel
                                    ALTERNATOR ) ) { //Else needs alternator = flicker
      u8g.drawBox(40, 18, map(FUEL_GAUGE, 0, 1023, 0, 88), 13);
    }
    u8g.drawBox(40, 34, map(ENGINE_TEMP, 0, 1023, 0, 88), 13);

    //Print out vertical stripes
    u8g.setColorIndex(0);//Black
    for(int i=48; i<130; i+= 8) {
      u8g.drawBox(i, 0, 1, 64);
    }

    u8g.setColorIndex(1);//White

    //Put this here so we do not get stripes
    if (drawWarmup) {
      char buffer [16];
      int timeToWarmup = (WARMUP_PERIOD - millis()) / 1024;     
      itoa(timeToWarmup, buffer, 10);
      u8g.drawStr(40, 14, buffer);
    } else if(FUEL_LAST == FUEL_REAR && !(FUEL_GAUGE > FUEL_LOW_THRES || ALTERNATOR)) {
        //Fuel low warning
        u8g.drawStr(40, 14, "REAR LO");
    } else if(drawSwitchFuel && ALTERNATOR) {
        u8g.drawStr(40, 14, "BLK RDY");
    }

    //Rear / front indicator
    if(FUEL_LAST == FUEL_REAR) {
      u8g.drawStr(40, 64, "REAR");
    } else {
      u8g.drawStr(40, 64, "MAIN");
    }

    //Print out HUD background
    u8g.drawBitmapP( 0, 0, 128/8, 64, epd_bitmap_HUD);

    //Print out normal range for engine temp
    //Black box to accentuate
    u8g.setColorIndex(0);//Black
    u8g.drawBox(82, 41, 5, 7);
    u8g.setColorIndex(1);//White
    //Engine should be at least 50C
    //From 0 to 100C, so: 84
    u8g.drawBox(83, 42, 3, 6);

    u8g.setContrast( SCREEN_BRIGHTNESS );
 } while ( u8g.nextPage() );
}