// #include <Arduino.h>
// #define LED_BUILTIN 15
// void setup() {
//   // put your setup code here, to run once:
//   pinMode(LED_BUILTIN, OUTPUT);
//   Serial.begin(115200);
//   Serial.println("Hello, ESP32!");
// }

// void loop() {
//   // put your main code here, to run repeatedly:
//   delay(1000);
//   digitalWrite(LED_BUILTIN, HIGH);
//   Serial.println("I am Chaitanya");
//   delay(1000);
//   digitalWrite(LED_BUILTIN, LOW);
// }
// the number of the LED pin
const int ledPin = 15;  // 16 corresponds to GPIO16
// const int ledPin2 = 17; // 17 corresponds to GPIO17
// const int ledPin3 = 5;  // 5 corresponds to GPIO5

// setting PWM properties
const int freq = 5000;
const int ledChannel = 0;
const int resolution = 8;
 
void setup(){
  // configure LED PWM functionalitites
  ledcSetup(ledChannel, freq, resolution);
  
  // attach the channel to the GPIO to be controlled
  ledcAttachPin(ledPin, ledChannel);
  // ledcAttachPin(ledPin2, ledChannel);
  // ledcAttachPin(ledPin3, ledChannel);
}
 
void loop(){
  // increase the LED brightness
  for(int dutyCycle = 0; dutyCycle <= 255; dutyCycle++){   
    // changing the LED brightness with PWM
    ledcWrite(ledChannel, dutyCycle);
    delay(15);
  }

  // decrease the LED brightness
  for(int dutyCycle = 255; dutyCycle >= 0; dutyCycle--){
    // changing the LED brightness with PWM
    ledcWrite(ledChannel, dutyCycle);   
    delay(15);
  }
}