void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(13, OUTPUT); //定義13腳位的為輸出
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(13, HIGH);   //設定13腳位為高電位
  delay(500); // this speeds up the simulation
  digitalWrite(13, LOW);    //設定13腳位為低電位
  delay(500); // this speeds up the simulation
}