// 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
// U8GLIB_SSD1306_128X64 u8g(13, 11, 8, 9, 10); // SPI connection
// for SPI connection, use this wiring:
// GND > GND
// VCC > 5V
// SCL > 13
// SDA > 11
// RES > 10
// DC > 9
// CS > 8
// 'HUD', 128x64px
const unsigned char epd_bitmap_HUD [] PROGMEM = {
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};
const unsigned char epd_bitmap_HUD_WARMUP [] PROGMEM = {
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0xc0, 0xd8, 0x0e, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xc0, 0xde, 0x0c, 0x3c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xc0, 0xcf, 0x18, 0xf6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xc0, 0xcf, 0x19, 0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xcf, 0x19, 0xe6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xc7, 0x18, 0xc6, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xc3, 0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xc3, 0x0e, 0x1c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xf3, 0x07, 0xf8, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xf3, 0x01, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xf3, 0x01, 0xe0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0x7f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xde, 0x7f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xff, 0xc0, 0x7f, 0xff, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
int BATTERY_LVL = 0;
int FUEL_GAUGE = 0;
int FUEL_TEMP = 0;
int FUEL_PRESSURE = 0;
int ENGINE_TEMP = 0;
int SCREEN_BRIGHTNESS;
float voltage_vcc = 4.95;
float NPT_RONE = 2000;
float FUEL_GAUGE_RONE = 2000;
float BATTERY_RONE = 2300000;
float BATTERY_RTWO = 1000000;
float ENGINE_TEMP_RONE = 2000;
float PRESSURE_RONE = 2000;
float BRIGHTNESSPOT_RMAX = 250000;
#define DEBUG
int BLACK_DIESEL = 4;
int NORMAL_DIESEL = 5;
int FUEL_LED = 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, 190.0));
return RTwo / 190.0 * 1024;
}
//NPT Fuel temperature sensor
//4V max = 910, if -10C
//0.173V min = 40, if 120C
float NPTCelciusToStandard(float tempC) {
float ret = max( -10, min( tempC, 120.0 ) );
return (ret + 10.0) / 130.0 * 1024; //[-10 to 120] is MAX TEMPERATURE
}
float NPTAnalogueRead(float reading) {
#ifdef DEBUG
reading = (reading / 1024.0) * 870.0 + 40.0;
#endif
float voltage = reading / 1024.0 * voltage_vcc;
float RTwo = voltage * NPT_RONE / (voltage_vcc - voltage);
//Alternative: y = -93.04495 + (588811.7 - -93.04495)/(1 + (x/9.501488e-19)^0.1728222)
float tempC = -93.16923 + 601332.16923/(1.0 + pow(RTwo/8.206620999999999e-19, 0.172713) );
return NPTCelciusToStandard(tempC);
}
float BatteryVoltage_Read(float reading) {
#ifdef DEBUG
//if reading = 0, then input was 10V, v_out => 3.0 = 682
//if reading = 1024, then input was 15, v_out => 3.8 = 864
reading = reading * (182.0 / 864.0) + 682.0;
#endif
float v_out = reading / 1024.0 * voltage_vcc;
float v_in = v_out * (BATTERY_RONE + BATTERY_RTWO) / BATTERY_RTWO;
float fullness = 142.9484 + (-1.368506 - 142.9484)/(1.0 + pow( (v_in/12.30958), 28.88789 ) );
return max(0, min(fullness / 100.0 * 1024, 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;
}
//Give output max 2 bar, anything above is too much
float Pressure_Read(float reading) {
#ifdef DEBUG
//If in debug, 0 is 0, 1024 is 0.387 volt
reading *= (0.387 / voltage_vcc);
#endif
float voltage = reading / 1024.0 * voltage_vcc;
float RTwo = voltage * PRESSURE_RONE / (voltage_vcc - voltage);
float pressure = 70329.59 + (-9.638731 - 70329.59)/(1.0 + pow(RTwo/796466000,0.5356234));
pressure = max(0, min(pressure, 2.0));
return pressure / 2.0 * 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_LED, OUTPUT);
pinMode(FUEL_SELECT, INPUT);
pinMode(NORMAL_DIESEL, OUTPUT);
pinMode(BLACK_DIESEL, OUTPUT);
//Serial.print("Warming up for: ");
//Serial.print(WARMUP_PERIOD);
//Serial.println("ms");
}
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 LED flickering
digitalWrite(FUEL_LED, LOW); //Turn it off, default
//SET LED COLOR
//Let know when can switch to black diesel
if( curFuel == FUEL_MAIN &&
millis() < 180000 && //Only first 3 minutes
ENGINE_TEMP >= TEMP_WARM_THRES
) {
digitalWrite(FUEL_LED, HIGH);
}
//Sound alarm if fuel gets low
else if( curFuel == FUEL_REAR && ALTERNATOR && FUEL_GAUGE <= FUEL_LOW_THRES) {
digitalWrite(FUEL_LED, HIGH);
}
BATTERY_LVL = BatteryVoltage_Read(analogRead(A0));
FUEL_GAUGE = FUEL_GAUGE_Read(analogRead(A1));
FUEL_TEMP = NPTAnalogueRead(analogRead(A2));
FUEL_PRESSURE = Pressure_Read(analogRead(A3));
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----------
//Battery
u8g.drawBox(40, 0, map(BATTERY_LVL, 0, 1023, 0, 88), 13);
//Fuel temperature
u8g.drawBox(40, 33, map(FUEL_TEMP, 0, 1023, 0, 88), 13);
//Fuel pressure
u8g.drawBox(40, 50, map(FUEL_PRESSURE, 0, 1023, 0, 88), 13);
//Rear fuel tank level
bool drawWarmup = WARMUP_PERIOD > 0 && millis() < WARMUP_PERIOD;
bool drawEngineTemp = false;
if(drawWarmup) {
//skip
} else if(FUEL_LAST == FUEL_REAR && (FUEL_GAUGE > FUEL_LOW_THRES || ALTERNATOR)) {
u8g.drawBox(40, 16, map(FUEL_GAUGE, 0, 1023, 0, 88), 13);
} else if(FUEL_LAST == FUEL_MAIN) {
u8g.drawBox(40, 16, map(ENGINE_TEMP, 0, 1023, 0, 88), 13);
drawEngineTemp = true;
}
//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
//Fuel low warning
if(FUEL_LAST == FUEL_REAR && !(FUEL_GAUGE > FUEL_LOW_THRES || ALTERNATOR)) {
u8g.drawStr(40, 30, "FUEL LO");
} else if (drawWarmup) {
char buffer [16];
int timeToWarmup = (WARMUP_PERIOD - millis()) / 1024;
itoa(timeToWarmup, buffer, 10);
u8g.drawStr(40, 30, buffer);
}
//Print out HUD background
if( digitalRead(FUEL_SELECT) == FUEL_MAIN) {
u8g.drawBitmapP( 0, 0, 128/8, 64, epd_bitmap_HUD_WARMUP);
} else {
u8g.drawBitmapP( 0, 0, 128/8, 64, epd_bitmap_HUD);
}
//Print out normal range
//Black box to accentuate
u8g.setColorIndex(0);//Black
//Fuel pressure
u8g.drawBox(77, 57, 5, 7);
u8g.drawBox(98, 57, 5, 7);
//Fuel temperature
u8g.drawBox(82, 40, 5, 7);
u8g.drawBox(98, 40, 5, 7);
if(drawEngineTemp) {
u8g.drawBox(82, 23, 5, 7);
}
u8g.setColorIndex(1);//White
//Fuel pressure 12.5 to 20 psi = 0.86 to 1.4 bar
//Show until 2 bar, so normal range = 440 to 720. Offset 40, 440/1024*88+40 = 78 , 101
// https://mopar1973man.com/cummins/articles.html/24-valve-2nd-generation_50/51_engine/59_fuel/fuel-pressure-specification-for-bosch-vp44-injection-pump-r21/
u8g.drawBox(78, 58, 3, 6);
u8g.drawBox(99, 58, 3, 6);
//Fuel temperature, should be between 60 and 85C
//Max temperature = 120C, so normal range = 440 to 720. Offset 40, 60/120*88+40 = 84 , 101
u8g.drawBox(83, 41, 3, 6);
u8g.drawBox(99, 41, 3, 6);
//Engine should be at least 50C
//From 0 to 100C, so: 84
if(drawEngineTemp) {
u8g.drawBox(83, 24, 3, 6);
}
} while ( u8g.nextPage() );
}
MOSFET
Normal diesel (12V)
MOSFET
Black diesel (12V)
MOSFET
FUEL / BUTTON LED (12V)
BATTERY
FUEL TEMP
FUEL PRESS
ENGINE TEMP
REAR TANK GAUGE
BRIGHTNESS