int red;
int green;
int blue;
void setup() {
  // put your setup code here, to run once:
  pinMode(5,OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  Serial.begin(9600);
  Serial.println("Hey! Please type in any Hexadecimal number");
}

void loop() {
  // put your main code here, to run repeatedly:
  if(Serial.available()!=0){
    convertHexDec(); } 
}

void convertHexDec(){
  String textInput = Serial.readString();
  textInput.trim();
  int goHigher = 0;
  Serial.print(textInput);
  Serial.print(" to Decimal: (");

  for(int i=0;i<3;i++){
    int currentInt = 0;
    char current = textInput.charAt(0+goHigher);
    switch(current){
      case '0': currentInt = currentInt + (0 * 16); break;
      case '1': currentInt = currentInt + (1 * 16); break;
      case '2': currentInt = currentInt + (2 * 16); break;
      case '3': currentInt = currentInt + (3 * 16); break;
      case '4': currentInt = currentInt + (4 * 16); break;
      case '5': currentInt = currentInt + (5 * 16); break;
      case '6': currentInt = currentInt + (6 * 16); break;
      case '7': currentInt = currentInt + (7 * 16); break;
      case '8': currentInt = currentInt + (8 * 16); break;
      case '9': currentInt = currentInt + (9 * 16); break;
      case 'A': currentInt = currentInt + (10 * 16); break;
      case 'a': currentInt = currentInt + (10 * 16); break;
      case 'B': currentInt = currentInt + (11 * 16); break;
      case 'b': currentInt = currentInt + (11 * 16); break;
      case 'C': currentInt = currentInt + (12 * 16); break;
      case 'c': currentInt = currentInt + (12 * 16); break;
      case 'D': currentInt = currentInt + (13 * 16); break;
      case 'd': currentInt = currentInt + (13 * 16); break;
      case 'E': currentInt = currentInt + (14 * 16); break;
      case 'e': currentInt = currentInt + (14 * 16); break;
      case 'F': currentInt = currentInt + (15 * 16); break;
      case 'f': currentInt = currentInt + (15 * 16); break; }
    
    current = textInput.charAt(1+goHigher);
    switch(current){
      case '0': currentInt = currentInt + 0; break;
      case '1': currentInt = currentInt + 1; break;
      case '2': currentInt = currentInt + 2; break;
      case '3': currentInt = currentInt + 3; break;
      case '4': currentInt = currentInt + 4; break;
      case '5': currentInt = currentInt + 5; break;
      case '6': currentInt = currentInt + 6; break;
      case '7': currentInt = currentInt + 7; break;
      case '8': currentInt = currentInt + 8; break;
      case '9': currentInt = currentInt + 9; break;
      case 'A': currentInt = currentInt + 10; break;
      case 'a': currentInt = currentInt + 10; break;
      case 'B': currentInt = currentInt + 11; break;
      case 'b': currentInt = currentInt + 11; break;
      case 'C': currentInt = currentInt + 12; break;
      case 'c': currentInt = currentInt + 12; break;
      case 'D': currentInt = currentInt + 13; break;
      case 'd': currentInt = currentInt + 13; break;
      case 'E': currentInt = currentInt + 14; break;
      case 'e': currentInt = currentInt + 14; break;
      case 'F': currentInt = currentInt + 15; break;
      case 'f': currentInt = currentInt + 15; break; }
    
    if(goHigher==0){red=currentInt;Serial.print(red);Serial.print("/");}
    else if(goHigher==2){green=currentInt;Serial.print(green);Serial.print("/");}
    else if(goHigher==4){blue=currentInt;Serial.print(blue);Serial.print(")");}
    goHigher = goHigher + 2; }

  analogWrite(3,red);
  analogWrite(5,green);
  analogWrite(6,blue);

  Serial.println("");

  Serial.end();
  Serial.begin(9600);
}