// Rotary Encoder Inputs
#define CLK 31
#define DT 33
#define encoderBtn 35

int counter = 0;
bool cwMove = false;   // flag to check if encoder is moved in cw direction
bool ccwMove = false;  // flag to check if encoder is moved in ccw direciton
int currentStateCLK;
int lastStateCLK;
void setup() {
  Serial.begin(9600);

  pinMode(encoderBtn, INPUT_PULLUP);
  // Set encoder pins as inputs
  pinMode(CLK, INPUT);
  pinMode(DT, INPUT);
  // Read the initial state of CLK
  lastStateCLK = digitalRead(CLK);

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

void loop() {
  updateEncoder();
  if (cwMove) {      // Check if encoder is moved in cw direciton
    cwMove = false;  // reset flag
    counter += 1;
    Serial.print("Counter:");
    Serial.println(counter);
  } else if (ccwMove) {  // Check if encoder is moved in ccw direciton
    ccwMove = false;     // reset flag
    counter -= 1;
    Serial.print("Counter:");
    Serial.println(counter);
  }
}
void updateEncoder() {
  // Read the current state of CLK
  currentStateCLK = digitalRead(CLK);
  // If last and current state of CLK are different, then pulse occurred
  // React to only 1 state change to avoid double count
  if (currentStateCLK != lastStateCLK && currentStateCLK == 1) {

    // If the DT state is different than the CLK state then
    // the encoder is rotating CCW so decrement
    if (digitalRead(DT) != currentStateCLK) {
      ccwMove = true;  // set ccw movement as true
    } else {
      // Encoder is rotating CW so increment
      cwMove = true;  // set cw movement as true
    }
  }
  // Remember last CLK state
  lastStateCLK = currentStateCLK;
}