void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(15,OUTPUT);
  Serial.println("esp32_DigitalWrite!");
}

void loop() {
  Serial.println("GPI015_HIGH");
  digitalWrite(15,HIGH);
  delay(500);
 Serial.println("GPI015_LOW");
 digitalWrite(15,LOW);
 delay(500);
 }