#define ENCODER_CLK 26
#define ENCODER_DT  27

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

int lastClk = HIGH;

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("Rotated clockwise ⏩");
    if (newClk == LOW && dtValue == LOW)
      Serial.println("Rotated counterclockwise ⏪");
  }
}