ProCarsFanAndLcd.ino

int vRpm = 0, vGear = 0, vSpeed = 0, vTemp = 0, vAbs = 0, vFuel = 0, vEngineState = 0, vLevel = 0, vTime = 0, vSplit = 0;
int LEDSTATE = 0;
char incomingByte = 0;
char data[50];
String sSpeed;
String sRpm;
int counter = 0;
int button = 1;
int state = 0;
String ver = "1.3.2"; // version number
String module = "1"; // module number

const int FanPin = 10;
int FanSpeed = 0; // Variable für die Lüftergeschwindigkeit

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 20, 4);

#include <string.h>

void setup() {
  lcd.begin();
  lcd.setCursor(0, 0);
  lcd.print("Luefter Vorbereiten");

  TCCR1B = TCCR1B & 0b11111000 | 0x01;
  pinMode(FanPin, OUTPUT) ;

  analogWrite(FanPin, 700);
  delay(5000);
  analogWrite(FanPin, 100);
  lcd.setCursor(0, 0);
  lcd.print("Bereit             ");

  pinMode(2, OUTPUT);

  Serial.begin(38400);

}
void loop() {

  if (Serial.available() > 0) {
    incomingByte = Serial.read();

    if (incomingByte != ';') {
      data[counter] = incomingByte;
      data[counter + 1] = '\0';
      counter ++;
    } else {

      String stringOne = data;

      if (stringOne.substring(0, 2) == "CC") {
        sRpm = stringOne.substring(2, 6);
        vRpm = sRpm.toInt();

        //here the right display for RPM,LAP,Water and Oil temp,position

      } else if (stringOne.substring(0, 3) == "VER") {
        //to version check
        Serial.println(ver + ";" + module + ";");

      } else if (stringOne.substring(0, 5) == "state") {
        //button state
        state = stringOne.substring(5, 6).toInt();

        if (state == 1) {
          String button_s = String(button);
          Serial.println(button_s + ":0:0:");
        }

      } else if (stringOne.substring(0, 2) == "DD") {
        sSpeed = stringOne.substring(2, 6);
        vSpeed = sSpeed.toInt();

        //here the speed display

      } else if (stringOne.substring(0, 2) == "BB") {
        vGear = stringOne.substring(2).toInt();
        //here the gear setup
        // -3 = clear
        // -2 = -
        // -1 = R
        // 0 = n
        // 1 - 6 = gear number

      } else if (stringOne.substring(0, 2) == "CH") {
        vLevel = stringOne.substring(2).toInt();

        //here the setup for Fule level data come in deziliter
        //fuel, oil, water pressure date come in Hektopascal

      } else if (stringOne.substring(0, 2) == "CA") {
        vTime = stringOne.substring(2).toInt();

        //here the setup for last, best and current time data come in Dezisekunde

      } else if (stringOne.substring(0, 2) == "CE") {
        vSplit = stringOne.substring(2).toInt();

        //here the setup for split times data come in ms

      } else if (stringOne.substring(0, 2) == "AA") {
        vTemp = stringOne.substring(2, 3).toInt(); //0 or 1 , 0 is off and 1 is on
        vAbs = stringOne.substring(3, 4).toInt(); //0 or 1
        vEngineState = stringOne.substring(4, 5).toInt(); //0 or 1
        vFuel = stringOne.substring(5, 6).toInt(); //0 or 1
        LEDSTATE = stringOne.substring(6, 7).toInt(); //0 - 8
        ////////////////////////////////////////////////////////////////////////////

        digitalWrite(2, vAbs);



        //FanSpeed = map(vSpeed *4, 51, 1023, 60, 255);

        FanSpeed = map(vSpeed * 4, 51, 1023, 100, 255);
        
        if (FanSpeed > 254)
        {
          FanSpeed = 255;
        }

        lcd.setCursor(0, 0);
        lcd.print("Kmh:");
        lcd.print(vSpeed);
        lcd.print("  ");

        lcd.setCursor(10, 0);
        lcd.print("Fan:");
        lcd.print(FanSpeed);
        lcd.print("  ");

        lcd.setCursor(0, 1);
        lcd.print("Fuel:");
        lcd.print(vFuel);
        lcd.print(" ");

        lcd.setCursor(10, 1);
        lcd.print("Level:");
        lcd.print(vLevel);
        lcd.print(" ");

        lcd.setCursor(0, 2);
        lcd.print("Gang:");
        lcd.print(vGear);
        lcd.print(" ");

        lcd.setCursor(10, 2);
        lcd.print("Temp:");
        lcd.print(vTemp);
        lcd.print(" ");

        lcd.setCursor(0, 3);
        lcd.print("Rpm:");
        lcd.print(sRpm);
        lcd.print(" ");

        lcd.setCursor(10, 3);
        lcd.print("Time:");
        lcd.print(vTime);
        lcd.print(" ");

        analogWrite(FanPin, FanSpeed);

      }
      data[0] = '\0';
      counter = 0;
    }
  }
}