#define ENCODER_CLK 2
#define ENCODER_DT  3
#define ENCODER_BTN 4
#define pinBuzzer   11
#define pinRelay    5

int pulsa = 0;

void setup() {
  Serial.begin(115200);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
  pinMode(ENCODER_BTN, INPUT_PULLUP);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(pinRelay, OUTPUT);
}

int lastClk = HIGH;
boolean btnPressed = false;

void loop() {
  int newClk = digitalRead(ENCODER_CLK);
  if (newClk != lastClk) {
    // There was a change on the CLK pin
    lastClk = newClk;
    int dtValue = digitalRead(ENCODER_DT);
    if (newClk == LOW && dtValue == HIGH) {
      Serial.println(pulsa);
      if (pulsa >= 20 && btnPressed == false){        
        tone(pinBuzzer, 1000);
        digitalWrite(pinRelay, HIGH);
      }
      pulsa+=2;
    }
    if (newClk == LOW && dtValue == LOW) {
      Serial.println(pulsa);    
      btnPressed = false;
      pulsa-=2;
    }
  }

  if (digitalRead(ENCODER_BTN) == LOW) {
    digitalWrite(LED_BUILTIN, HIGH);
    btnPressed = true;
    noTone(pinBuzzer);
    digitalWrite(pinRelay, LOW);
  } else {
    digitalWrite(LED_BUILTIN, LOW);
  }
}