#define ENCODER_PIN_A 9  // Pin connected to encoder A output
#define ENCODER_PIN_B 8  // Pin connected to encoder B output
#define ENCODER_BUTTON_PIN 0
#define LED_PIN 2     // the number of the LED pin


volatile int encoderCount = 0;


bool ledState = false;         // the current state of the LED
int buttonState;               // the current reading from the input pin
bool lastButtonState = false;  // the previous reading from the input pin

// the following variables are long because the time, measured in milliseconds,
// will quickly become a bigger number than can be stored in an int.
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers


void setup() {
  pinMode(ENCODER_BUTTON_PIN, INPUT_PULLUP);
  pinMode(LED_PIN, OUTPUT);

  pinMode(ENCODER_PIN_A, INPUT);
  pinMode(ENCODER_PIN_B, INPUT);
  attachInterrupt(digitalPinToInterrupt(ENCODER_PIN_A), encoderISR, CHANGE);


  Serial.begin(9600);
}

void loop() {
    // Print the encoder count
    Serial.print("Encoder Count: ");
  Serial.println(encoderCount);
  delay(100);  // Update every second


  // read the state of the switch into a local variable:
  int reading = digitalRead(ENCODER_BUTTON_PIN);

  // check to see if you just pressed the button
  // (i.e., the input went from LOW to HIGH), and you've waited long enough
  // since the last press to ignore any noise:

  // If the switch changed, due to noise or pressing:
  if (reading != lastButtonState) {
    // reset the debouncing timer
    lastDebounceTime = millis();
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    // whatever the reading is at, it's been there for longer than the debounce
    // delay, so take it as the actual current state:

    // if the button state has changed:
    if (reading != buttonState) {
      buttonState = reading;

      // only toggle the LED if the new button state is HIGH
      if (buttonState == HIGH) {

        encoderCount = 0;
        ledState = !ledState;
      }
    }
  }



  // set the LED:
  digitalWrite(LED_PIN, ledState);

  // save the reading. Next time through the loop, it'll be the lastButtonState:
  lastButtonState = reading;
}

void encoderISR() {
  // Read the state of pin B
  if (digitalRead(ENCODER_PIN_A) == digitalRead(ENCODER_PIN_B)) {
    encoderCount++;
  } else {
    encoderCount--;
  }
  //   Serial.print("Encoder Count: ");
  // Serial.println(encoderCount);
}