// EME3153   Ex6 Q3
// Student: Alan Lee
// Student ID: 250258181
// Class: 1B  (EG114403)
// Wokwi:  https://wokwi.com/projects/447287130872783873

#define LED_Out_Pin 25
#define SW_In_Pin 15
#define VR_In_Pin 36

int VRvalue;
int fadevalue;
int LightIntensity = 0;
int timeb = 0;
int textbt = 0;
int textct = 0;

int textperiod = 10000;

void setup()
{
  // Initialize serial port
  Serial.begin(115200);

  // Set pins
  pinMode(SW_In_Pin, INPUT_PULLUP);

  // Initialize PWM channel
  // channel 0-15, resolution 1-16 bits, freq limits depend on resolution
  ledcAttach(LED_Out_Pin, 12000, 12);  // 12 kHz PWM, 12-bit resolution
}

void loop()
{
  VRvalue = analogRead(VR_In_Pin);
  if (fadevalue != VRvalue) {
    textbt = 1;
    timeb = 0;
  }
  fadevalue = VRvalue;
  ledcWrite(LED_Out_Pin, fadevalue);
  LightIntensity = map(VRvalue, 0, 4095, 0, 100);
  
  if (digitalRead(SW_In_Pin))
  {
    ledcWrite(LED_Out_Pin, fadevalue);
    textct = 0;
  }
  else
  {
    digitalWrite(LED_Out_Pin, LOW);
    if (textct == 0) {
      texta();
      int tempa = LightIntensity / 5;
      int tempb = LightIntensity % 5;
      Serial.println("LED light intensity bar: ");
      Serial.print(" 0 ");
      for (int i = tempa; i > 0; i--){
        Serial.print("■");
      }
      if (tempb > 0){
        Serial.print("#");
        for (int i = (20 - tempa - 1); i > 0; i--){
          Serial.print("□");
        }
      } else {
        for (int i = (20 - tempa); i > 0; i--){
          Serial.print("□");
        }
      }
      Serial.println(" 100 ");
      Serial.println("* Each block occupies 5%.");
      textct = 1;
    }
    timeb = 0;
  }

  if (textbt == 1 && timeb >= 500) {
    texta();
    textbt = 0;
    timeb = 0;
  } else if (textbt == 0 && timeb >= textperiod) {
    texta();
    textbt = 0;
    timeb = 0;
  }
  timeb++;
  delay(1);
}

void texta() {
  Serial.println("=======================================================");
  Serial.print("Raw Sensor reading: ");
  Serial.print(fadevalue);
  Serial.print("\tLED light intensity: ");
  Serial.print(LightIntensity);
  Serial.println("% ");
}