#define CLK 2
#define DT 3
int counter = 0;
int currentStateCLK;
int lastStateCLK;
String currentDir = "";

void setup() {
  // put your setup code here, to run once:
  pinMode(CLK,INPUT);
  pinMode(DT,INPUT);
  Serial.begin(9600);
  lastStateCLK = digitalRead(CLK);

  attachInterrupt(digitalPinToInterrupt(2),updateEncoder,CHANGE);
  attachInterrupt(digitalPinToInterrupt(3),updateEncoder,CHANGE);

}

void loop() {
  // put your main code here, to run repeatedly:

}

void updateEncoder(){
  currentStateCLK = digitalRead(CLK);
  if (currentStateCLK != lastStateCLK && currentStateCLK == 1){
    if(digitalRead(DT) != currentStateCLK){
      counter ++;
      currentDir = "CW";
    }else{
      counter --;
      currentDir = "CCW";
    }
    Serial.print("Direction: ");
    Serial.print(currentDir);
    Serial.print(" | Counter: ");
    Serial.println(counter);
  }
  lastStateCLK = currentStateCLK;
}