#define LED1 18
#define LED2 5
void setup() {
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
 
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
}

void loop() {
  // Gradually increase brightness:

  for (int dutyCycle = 0; dutyCycle <= 255; dutyCycle +=51) {
    analogWrite(LED1, dutyCycle);
    analogWrite(LED2, dutyCycle);
    delay(1000);
  }
   // Turn off LEDs for 2 seconds:
  analogWrite(LED1, 0);
  analogWrite(LED2, 0);
  delay(1000);

  // Increase to full brightness:
  for (int dutyCycle = 0; dutyCycle <= 255; dutyCycle += 51) {
    analogWrite(LED1, dutyCycle);
    analogWrite(LED2, dutyCycle);
    delay(300);
  }
  // Repeat steps four times:
  for (int i = 0; i < 4; i++) {
    analogWrite(LED1, 0);
    analogWrite(LED2, 0);
    delay(1000);
  }

    for (int dutyCycle = 0; dutyCycle <= 255; dutyCycle += 51) {
      analogWrite(LED1, dutyCycle);
      analogWrite(LED2, dutyCycle);
      delay(300);
    }
}