#define LED_PIN 15
#define BUTTON_PIN 12
#define SLIDE_PIN 34
#define ENCODER_CLK 5
#define ENCODER_DT  4
void LED_On(uint8_t brightness)
{
  pinMode(LED_PIN, OUTPUT);
  analogWrite(LED_PIN, 255 - brightness);
}
void LED_Off()
{
  pinMode(LED_PIN, OUTPUT);
  digitalWrite(LED_PIN, HIGH);
}

uint8_t ReadSlideValue()
{
  int value;
  value = analogRead(SLIDE_PIN);
  value >>= 4;
  if (value < 8)
    value = 8;
  return value;
}

bool button_up = true;
bool led_stat = false;

void setup() {
  Serial.begin(115200);
  LED_Off();
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(SLIDE_PIN, INPUT);
  pinMode(ENCODER_CLK, INPUT);
  pinMode(ENCODER_DT, INPUT);
}
int lastClk = HIGH;

void loop() {
  uint8_t brightness_set;
int newClk = digitalRead(ENCODER_CLK);
  if (newClk != lastClk) {
    // There was a change on the CLK pin
    lastClk = newClk;
    int dtValue = digitalRead(ENCODER_DT);
    if (newClk == LOW && dtValue == HIGH) {
      Serial.println("Rotated clockwise ⏩");
    }
    if (newClk == LOW && dtValue == LOW) {
      Serial.println("Rotated counterclockwise ⏪");
    }
  }
  if (digitalRead(BUTTON_PIN) == LOW)
  {
    if (button_up)
    {
      button_up = false;
      led_stat = !led_stat;
    }
  }
  else
  {
    button_up = true;
  }
  if (led_stat)
  {
    brightness_set = ReadSlideValue();
    LED_On(brightness_set);
  }
  else
    LED_Off();

  delay(10); // this speeds up the simulation
}