void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode (15,OUTPUT);
  pinMode (4,OUTPUT);
  pinMode (5,OUTPUT);
}

void loop() {
  digitalWrite (15,HIGH);
  digitalWrite (4,LOW);
  digitalWrite (5,LOW);
  delay(2000);
  digitalWrite(15,LOW);
  digitalWrite (4,HIGH);
  digitalWrite (5,LOW);
  delay(1000);
  digitalWrite (15,LOW);
  digitalWrite (4,LOW);
  digitalWrite (5,HIGH);
  delay(2000); 
}