#define ENCODER_CLK 2
#define ENCODER_DT 15

void setup() {
  Serial.begin(115200);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
}

int lastClk = HIGH;
int cont = 0;

void loop() {
  
  int newClk = digitalRead(ENCODER_CLK);
  
  if (newClk != lastClk) {
    // There was a change on the CLK pin
    lastClk = newClk;
    Serial.println(lastClk);
    Serial.println(newClk);
    
    int dtValue = digitalRead(ENCODER_DT);
    Serial.println(dtValue);
    if (newClk == LOW && dtValue == HIGH) {
      Serial.println("Rotated clockwise ⏩");
      cont =  cont + 1;
      Serial.println(cont);
    }
    if (newClk == LOW && dtValue == LOW) {
      Serial.println("Rotated counterclockwise ⏪");
      cont = cont - 1;
      Serial.println(cont);
    }
  }
}