#define encCLK 7
#define encDT 8

volatile int dir;
volatile bool flag;
volatile int counter;
volatile int laststate = 1;
volatile uint64_t lastPulse;

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    delay(10);
  }
  pinMode(encCLK, INPUT);
  pinMode(encDT, INPUT);
  attachInterrupt(digitalPinToInterrupt(encCLK), encoderISR, CHANGE);
}

void encoderISR() {
  uint64_t now = millis();
  int state = digitalRead(encCLK);
  if (state != laststate && state == LOW) {
    if (now - lastPulse >= 500) {
      lastPulse = now;
      flag = true;
      if (digitalRead(encDT) != state) {
        dir = 1;
        counter++;
      } else {
        dir = 0;
        counter--;
      }
    }
  }
  laststate = state;
}

void loop() {
  if (flag) {
    Serial.print(dir ? "CW " : "CCW ");
    Serial.println(counter);
    flag = false;
  }
  delay(10);
}