//configuration led 
int ledRedPin = 15;
int ledOrangePin = 2;
int ledGreenPin = 4;

void setup() {
  // put your setup code here, to run once:
  pinMode(ledRedPin, OUTPUT);
  pinMode(ledOrangePin, OUTPUT);
  pinMode(ledGreenPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(ledRedPin, HIGH);
  delay(300);
  digitalWrite(ledRedPin, LOW);
  digitalWrite(ledOrangePin, HIGH);
  delay (300);
  digitalWrite(ledOrangePin, LOW);
  digitalWrite(ledGreenPin, HIGH);
  delay(300);
  digitalWrite(ledGreenPin, LOW);
}