Vault Opened

 #define CLK 6
 #define DT 7
 #define SW 5
 #define BLUE 11
 #define GREEN 10
 #define YELLOW 9
 #define RED 8
 int counter = 0;
 int aState;
 int aLastState;
 int randNumber;
 int scoreCounter = 4;
 int scoreHolder = 0;

 void setup()
 {
   pinMode (CLK,INPUT);
   pinMode (DT,INPUT);
   pinMode (SW,INPUT);
   pinMode (BLUE,OUTPUT);
   pinMode (GREEN,OUTPUT);
   pinMode (YELLOW,OUTPUT);
   pinMode (RED,OUTPUT);

   Serial.begin (9600);
   // Reads the initial state of the outputA
   aLastState = digitalRead(CLK);

   randomSeed(analogRead(A0));
   randNumber = random(100);
   Serial.println(randNumber);

   digitalWrite(BLUE, LOW);
   digitalWrite(GREEN, LOW);
   digitalWrite(YELLOW, LOW);
   digitalWrite(RED, HIGH);
 }

 void loop()
 {

  if (digitalRead(SW) == LOW)
     {
     GetScore(counter);
     randNumber = random(100);
     CalculateDiff(counter);

      if (scoreHolder == scoreCounter)
      {
        Serial.println("Congratulations! You unlocked the safe");
        scoreHolder = 0;
      }
     }

   aState = digitalRead(CLK); // Reads the "current" state of the outputA
   // If the previous and the current state of the outputA are different, that means a Pulse has occured
   if (aState != aLastState)
   {
     // If the outputB state is different to the outputA state, that means the encoder is rotating clockwise
     if (digitalRead(DT) != aState)
     {
       counter ++;
     }
      else
     {
       counter --;
     }

     if (counter > 100)
     {
      counter = 0;
     }
     else if (counter < 0)
     {
      counter = 100;
     }

     CalculateDiff(counter);
     Serial.println(counter);
     Serial.println(randNumber);
   }

   aLastState = aState; // Updates the previous state of the outputA with the current state
 }


 int CalculateDiff(int count)
 {
  int Diff = randNumber - count;
  Serial.println(Diff);
     if (Diff < 10 || Diff > -10)
     {
      digitalWrite(YELLOW, HIGH);
      digitalWrite(RED, LOW);
      digitalWrite(GREEN, LOW);
     }

     if(Diff > 10 || Diff < -10)
     {
      digitalWrite(YELLOW, LOW);
      digitalWrite(GREEN, LOW);
      digitalWrite(RED, HIGH);
     }

     if (Diff == 0)
     {
      digitalWrite(GREEN, HIGH);
      digitalWrite(RED, LOW);
      digitalWrite(YELLOW, LOW);
     }
   return Diff;
 }

 void GetScore(int counterValue)
 {
   if (CalculateDiff(counterValue) == 0)
      {
        digitalWrite(BLUE, HIGH);
        digitalWrite(GREEN, LOW);
        delay (500);
        digitalWrite(BLUE, LOW);
        scoreHolder = scoreHolder + 1;
        Serial.print("Score:");
        Serial.println(scoreHolder);
      }
      else
      {
        digitalWrite(BLUE, HIGH);
        digitalWrite(GREEN, HIGH);
        digitalWrite(YELLOW, HIGH);
        digitalWrite(RED, HIGH);
        delay (500);
        digitalWrite(BLUE, LOW);
        digitalWrite(GREEN, LOW);
        digitalWrite(YELLOW, LOW);
        digitalWrite(RED, LOW);
        scoreHolder = 0;
        Serial.print("Score:");
        Serial.println(scoreHolder);
      }
 }