void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  if(!serial) Serial.println("serial is ot ok");
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(3, HIGH);
Serial.println("red is on");
delay(6000);
digitalWrite(3, LOW);
Serial.println("red is off");
}