/*
  ESP32 128x64 OLED Write Text Example
  http:://www.electronicwings.com
*/

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define Oilpressure 15 // Olitryk maler  
String OilPressure_read = "Oil pressure OK";

#define EngineTemperature  16 //Engine temperaure switch
String EngineTemperature_read = "Engine Temperature OK";

#define VoltAnalogInput 35  //Volt input analog
float volt_calculation = 0.0;
float volt_real = 0.0;
float R1 = 30000.0; //30k
float R2 = 8300.0; //7500 ohm resistor, I tweaked this 8300
int Value_Volt_read = 0; //Volt calculation because V_input has to be below 3.3v



void setup() {

  pinMode(Oilpressure, INPUT_PULLUP);
  pinMode(EngineTemperature, INPUT_PULLUP);
  pinMode(VoltAnalogInput, INPUT);

  Serial.begin(9600);
  if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);                          // Don't proceed, loop forever
  }
  delay(2000);                       // Pause for 2 seconds
  display.clearDisplay();
  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);// Draw white text
  display.setCursor(0,0);             // Start at top-left corner
  display.println(F("Hello, world!"));
  display.setCursor(0,15);
  display.println(F("OilPressure_read"));
  display.setCursor(0,30);
  display.println(F("Engine Temp_read"));
  display.setCursor(0,45);
  display.println(F("Voltage_read")); 

  display.display();
  delay(2000);
}

void loop() {

int Oilp=digitalRead(Oilpressure);
if (Oilp==LOW){
OilPressure_read = "Oilpressure Low";
}
else OilPressure_read = "Oilpressure ok";

int EngineT=digitalRead(EngineTemperature);
if (EngineT==LOW){
EngineTemperature_read = "EngineTemp High";
}
else EngineTemperature_read = "EngineTemperature ok";


Value_Volt_read = analogRead(VoltAnalogInput);
volt_calculation = (Value_Volt_read*5)/1024;
volt_real = volt_calculation/ (R2/(R1+R2));

//float volt_calculation = 0.0;
//float volt_real = 0.0;

delay(2000);                       // Pause for 2 seconds
  display.clearDisplay();
  display.setTextSize(1);             // Normal 1:1 pixel scale
  display.setTextColor(SSD1306_WHITE);// Draw white text
  display.setCursor(0,0);             // Start at top-left corner
  display.println(F("Volvo Penta MD22"));
  display.setCursor(0,15);
  display.println(OilPressure_read);
  display.setCursor(0,30);
  display.println(EngineTemperature_read);
  display.setCursor(0,45);
  display.println(F("Voltage= "));
  display.setCursor(52,45);
  display.println(volt_real);
  display.setCursor(84,45);
  display.println(F("Volt"));


  display.display();
  

  delay(2000);


}







//void setup() {
  // put your setup code here, to run once:
 // Serial.begin(115200);
 // Serial.println("Hello, ESP32!");
//}

//void loop() {
  // put your main code here, to run repeatedly:
  //delay(10); // this speeds up the simulation
//}