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

void loop() {
 Serial.println("GPI015_HIGH");
 digitalWrite(15, HIGH);
 digitalWrite(16, HIGH);
 delay(200);

 Serial.println("GPI015_HIGH");
 digitalWrite(15, LOW); 
  digitalWrite(16, LOW);
 delay(200);

}