void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
pinMode(18,OUTPUT);
pinMode(5, OUTPUT);
pinMode(17,OUTPUT);

}

void loop() {
  digitalWrite(18, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(17, LOW);
  delay(2000);
  digitalWrite(5, HIGH);
  digitalWrite(18, LOW);
  digitalWrite(17, LOW);
  delay(2000);
  digitalWrite(17, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(18, LOW);
  delay(2000);
  digitalWrite(5, HIGH);
  digitalWrite(18, LOW);
  digitalWrite(17, LOW);
}