#define encoderB 3

long lastDebounceTime = 0;
long delayDebounce = 100;

unsigned int incremento = 1;

volatile unsigned int var = 0;

void setup() {
  pinMode(encoderA, INPUT);
  //digitalWrite(encoderA, HIGH);
  pinMode(encoderB, INPUT);
  //digitalWrite(encoderB, HIGH);
  attachInterrupt(0, encoder, CHANGE);
  Serial.begin(9600);
}

void loop(){

}

void encoder() {

  int readA = digitalRead(encoderA);
  int readB = digitalRead(encoderB);
 Serial.println(var);

  if(readA==readB){
    lastDebounceTime = micros();
    delay(100);
  }

if((micros() - lastDebounceTime) > delayDebounce){
  if(readA==readB){

    var += incremento;

    if(var > 100) var = 0;
  }
  else{
    var -= incremento;
    if(var < 1) var = 100;
  }
}

}