// Make sure you're using the ESP32 board
const int pwmPin = 23;  // GPIO 23 for PWM output

// PWM properties
const int pwmFrequency = 5000; // 5 kHz frequency
const int pwmChannel = 0;      // PWM channel 0
const int pwmResolution = 8;   // 8-bit resolution (0-255)

// Brightness and fading variables
int brightness = 0;
int fadeAmount = 5;

void setup() {
  // Initialize PWM channel
  ledcSetup(pwmChannel, pwmFrequency, pwmResolution);

  // Attach the PWM channel to GPIO pin
  ledcAttachPin(pwmPin, pwmChannel);
}

void loop() {
  // Set the brightness using the PWM channel
  ledcWrite(pwmChannel, brightness);

  // Update brightness value
  brightness += fadeAmount;

  // Reverse fading direction at limits
  if (brightness <= 0 || brightness >= 255) {
    fadeAmount = -fadeAmount;
  }

  // Delay for a smooth fade effect
  delay(30);
}