// Rotary Encoder Inputs
#define CLK 14
#define DT 27

int counter = 0;
String currentDir = "";
bool state = false;

void IRAM_ATTR updateEncoder() {
  state = true;
}

void setup() {
  // Set encoder pins as inputs
  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);

  // Setup Serial Monitor
  Serial.begin(115200);

  // Call updateEncoder() when any high/low changed seen
  // on interrupt 0 (pin 2), or interrupt 1 (pin 3)
  attachInterrupt(14, updateEncoder, CHANGE);
}

void loop() {
  if (state) {
    // If the DT state is different than the CLK state then
    // the encoder is rotating CCW so decrement
    if (digitalRead(DT) != digitalRead(CLK)) {
      counter++;
      currentDir = "CW";
    } else {
      // Encoder is rotating CW so increment
      counter--;
      currentDir = "CCW";
    }

    Serial.print("Direction: ");
    Serial.print(currentDir);
    Serial.print(" | Counter: ");
    Serial.println(counter);

    state = false;
  }
}