const int L_LED = 13;
const int encoderA = 2;
const int encoderB = 3;
const int SW = 4;

int lastStateA;
int lastStateSW; 
long cnt = 0;

void setup() {
  pinMode(L_LED, OUTPUT);
  pinMode(encoderA, INPUT);
  pinMode(encoderB, INPUT);
  pinMode(SW, INPUT_PULLUP);  //pinMode(SW, INPUT);
  lastStateA = digitalRead(encoderA);
  lastStateSW = digitalRead(SW);;
  Serial.begin(9600);
}

void loop() {
  int StateA = digitalRead(encoderA);

  if (StateA != lastStateA) { // 엔코더A의 상태가 변하면
    int StateB = digitalRead(encoderB);

    if (StateA == LOW && StateB == HIGH) {
      cnt++;
      Serial.println("Rotated clockwise ⏩");
      Serial.println(cnt);
    }
    if (StateA == LOW && StateB == LOW) {
      cnt--;
      Serial.println("Rotated counterclockwise ⏪");
      Serial.println(cnt);
    }
    lastStateA = StateA;    
  }
  
  int sw_state = digitalRead(SW);
  if(lastStateSW != sw_state)
  {
    if(sw_state == LOW)
    {
      cnt = 0;
      Serial.println("cnt Reset");
      Serial.println(cnt);
    }
    lastStateSW = sw_state;
  }
}