// Program: DualCyclePWM-E_v3.ino

#define LED 25  // define GPIO pin no. for the LED output

int freq = 1000;
int resolution = 8;

void setup() {
  // Serial.begin(115200);
  ledcAttach(LED, freq, resolution);
}

void loop() {
  // 1st phase: increasing brightness
  for (int dutyCycle = 0; dutyCycle <= 255; dutyCycle++) {
    // Serial.print("Duty Cycle = ");
    // Serial.println(dutyCycle);
    ledcWrite(LED, dutyCycle);
    delay(10);
  }

  // 2nd phase: decreasing brightness
  for (int dutyCycle = 255; dutyCycle >= 0; dutyCycle--) {
    // Serial.print("Duty Cycle = ");
    // Serial.println(dutyCycle);
    ledcWrite(LED, dutyCycle);
    delay(10);
  }
}