#define GREEN_PIN  PA5
#define YELLOW_PIN PA6
#define RED_PIN    PA7

void setup() {
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(YELLOW_PIN, OUTPUT);
  pinMode(RED_PIN, OUTPUT);
  Serial.begin(115200);
}

void loop() {
  digitalWrite(GREEN_PIN, HIGH);
  digitalWrite(YELLOW_PIN, LOW);
  digitalWrite(RED_PIN, LOW);
  Serial.println("GREEN");
  delay(3000);

  digitalWrite(GREEN_PIN, LOW);
  digitalWrite(YELLOW_PIN, HIGH);
  digitalWrite(RED_PIN, LOW);
  Serial.println("ORANGE");
  delay(2000);

  digitalWrite(GREEN_PIN, LOW);
  digitalWrite(YELLOW_PIN, LOW);
  digitalWrite(RED_PIN, HIGH);
  Serial.println("RED");
  delay(4000);
}