// Program: 1A Ex6 Q3 Chan Tai Ming.ino

// Program: Ex6C_Analog_Output-E.ino
// Wokwi:   https://wokwi.com/projects/341138337709425236

/*
   Exercise 6 Q3

   Change the program of Ex6C_Analog_Output-E to:
   1. Fully turn on the LED at 3.3V from VR
   2. Dim the LED to zero intensity at 0V from VR
*/

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

int VRvalue;
int fadevalue;
int duty_cycle;

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

  // Set pins
  pinMode(SW_In_Pin, INPUT_PULLUP);

  // Assign pin to PWM channel
  ledcAttachPin(LED_Out_Pin, 1);

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

void loop()
{
  // Reading
  VRvalue = analogRead(VR_In_Pin);

  // Display
  Serial.print("Raw Sensor reading: ");
  Serial.println(VRvalue);

  duty_cycle = map(VRvalue, ??, ??, ??, ??);

  ledcWrite(1, duty_cycle);

  // fade in from min to max in increments of 5 points
  // for (fadevalue = 0; fadevalue <= 4095; fadevalue += 5)
  // {
  //   ledcWrite(1, fadevalue);
  //   // wait for 5 ms to see the dimming effect
  //   delay(5);
  // }
  // delay(1000);

  // fade out from max to min in increments of 5 points
  // for (fadevalue = 4095; fadevalue >= 0; fadevalue -= 5)
  // {
  //   ledcWrite(1, fadevalue);
  //   // wait for 5 ms to see the dimming effect
  //   delay(5);
  // }
  delay(1000);
}