int n = 0;
int BUTTON = 4;
int brightness = 20; //how bright the led is
int fadeAmount = 10; // how many points to fade the LED by
unsigned long currentTime;
unsigned long loopTime;
const int pin_A = 2; // pin 4
const int pin_B = 3; // pin 5
unsigned char encoder_A;
unsigned char encoder_B;
unsigned char encoder_A_prev=0;


void setup() {
  // declare pin 9 to be an output:
  Serial.begin(9600);
  pinMode(9, OUTPUT);
  pinMode(pin_A, INPUT);
  pinMode(pin_B, INPUT);
  currentTime = millis();
  loopTime = currentTime;
  pinMode(BUTTON, INPUT);


  Serial.begin(9600);

}

void loop() {
  // get the current elapsed time:
  Serial.println(n);
  //delay(400);
  currentTime = millis();
  if(currentTime >= (loopTime + 3)){
    //5ms since last check of encoder = 200Hz
    encoder_A = digitalRead(pin_A); //Read encoder pins
    encoder_B = digitalRead(pin_B);
    Serial.print(encoder_A);
    Serial.print(encoder_B);
    if((!encoder_A) && (encoder_A_prev)){
      // A has gone from high to low
      if(encoder_B) {
        // B is high so clockwise
        // increase the brightness, dont go over 255
        if(brightness + fadeAmount <=255) brightness += fadeAmount;
      }
      else {
        //B is low so counter-clockwise
        // decrease the brightness, dont go below 0
        if(brightness - fadeAmount >= 0) brightness -= fadeAmount;
      }

    }
    encoder_A_prev = encoder_A; // store value of A for next time

    // set the brightness of pin 9:

    if(digitalRead(BUTTON) == HIGH)
    {
      analogWrite(9, brightness);
    }
    else
    {
      analogWrite(9, 0);
    }

    loopTime = currentTime; // Updates loopTime
  }
  //other processing can be done here
}