void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(25, OUTPUT);
  pinMode(26, OUTPUT);
  pinMode(27, OUTPUT);
}

void loop() {
  digitalWrite(25,HIGH);
  delay(1000);
  digitalWrite(25,LOW);
  delay(1000);

  digitalWrite(26,HIGH);
  delay(1000);
  digitalWrite(26,LOW);

  digitalWrite(27,HIGH);
  delay(1000);
  digitalWrite(27,LOW);
  delay(1000);
}