int LED1=26;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(LED1,OUTPUT);
}

void loop() {
  digitalWrite(LED1,HIGH);
  Serial.println("on");
  delay(1000);
  digitalWrite(LED1,LOW);
  Serial.println("off");
  delay(1000);
}