const int LED_PIN=15;
void setup() {
  
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(LED_PIN, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  // turn the LED on (HIGH is the voltage level)
  digitalWrite(LED_PIN, HIGH);
  delay(500); 
  // turn the LED off by making the voltage LOW
  digitalWrite(LED_PIN, LOW);
  
  delay(500); 
}