void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(12,OUTPUT);
  pinMode(13,OUTPUT);
  pinMode(14,OUTPUT);
  pinMode(21,OUTPUT);
  pinMode(19,OUTPUT);
  pinMode(18,OUTPUT);
}
void loop() {
  digitalWrite(13,HIGH);
  digitalWrite(21,HIGH);
  delay(5000);
  digitalWrite(13,LOW);
  digitalWrite(21,LOW);
  digitalWrite(12,HIGH);
  digitalWrite(19,HIGH);
  delay(5000);
  digitalWrite(12,LOW);
  digitalWrite(19,LOW);
  digitalWrite(14,HIGH);
  digitalWrite(18,HIGH);
  delay(5000);
  digitalWrite(14,LOW);
  digitalWrite(18,LOW);
  delay(5000);
}