void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(23,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(23,1);
  Serial.println("LED ON");
  delay(500); 
  digitalWrite(23,0);
  Serial.println("LED OFF");
  delay(500); 
}