int d_red = 10;
int d_yellow = 9;
int d_green = 8;
int r_red = 4;
int r_yellow = 3;
int r_green = 2;
int l_red = 13;
int l_yellow = 12;
int l_green = 11;
int u_red = 7;
int u_yellow = 6;
int u_green = 5;
void setup()
{
  pinMode(d_red, OUTPUT);
  pinMode(d_yellow, OUTPUT);
  pinMode(d_green, OUTPUT);
  pinMode(r_red, OUTPUT);
  pinMode(r_yellow, OUTPUT);
  pinMode(r_green, OUTPUT);
  pinMode(l_red, OUTPUT);
  pinMode(l_yellow, OUTPUT);
  pinMode(l_green, OUTPUT);
  pinMode(u_red, OUTPUT);
  pinMode(u_yellow, OUTPUT);
  pinMode(u_green, OUTPUT);

  Serial.begin(115200); // Any baud rate should work
  Serial.println("System Starting...");
}

void loop() {
  changeLights();

  if (Serial.available() > 0) {
    String command = Serial.readStringUntil('\n');
    Serial.println(command);
  }
}

void changeLights() {
  //Start (all yellow)
  digitalWrite(u_red, LOW);
  digitalWrite(d_red, LOW);
  digitalWrite(r_red, LOW);
  digitalWrite(l_green, LOW);
  digitalWrite(u_yellow, HIGH);
  digitalWrite(d_yellow, HIGH);
  digitalWrite(r_yellow, HIGH);
  digitalWrite(l_yellow, HIGH);
  delay(5000);

  //upper lane go
  digitalWrite(u_yellow, LOW);
  digitalWrite(d_yellow, LOW);
  digitalWrite(r_yellow, LOW);
  digitalWrite(l_yellow, LOW);
  digitalWrite(u_green, HIGH);
  digitalWrite(r_red, HIGH);
  digitalWrite(l_red, HIGH);
  digitalWrite(d_red, HIGH);
  Serial.println("UPPER LINE GO");
  delay(10000);

  //ALL YELLOW
  digitalWrite(u_yellow, HIGH);
  digitalWrite(d_yellow, HIGH);
  digitalWrite(r_yellow, HIGH);
  digitalWrite(l_yellow, HIGH);
  digitalWrite(u_green, LOW);
  digitalWrite(r_red, LOW);
  digitalWrite(l_red, LOW);
  digitalWrite(d_red, LOW);
  delay(5000);

  //RIGHT LANE GO
  digitalWrite(u_yellow, LOW);
  digitalWrite(d_yellow, LOW);
  digitalWrite(r_yellow, LOW);
  digitalWrite(l_yellow, LOW);
  digitalWrite(u_red, HIGH);
  digitalWrite(l_red, HIGH);
  digitalWrite(d_red, HIGH);
  digitalWrite(r_green, HIGH);
  Serial.println("RIGHT LANE GO");
  delay(10000);

  //ALL YELLOW ON
  digitalWrite(u_yellow, HIGH);
  digitalWrite(d_yellow, HIGH);
  digitalWrite(r_yellow, HIGH);
  digitalWrite(l_yellow, HIGH);
  digitalWrite(u_red, LOW);
  digitalWrite(l_red, LOW);
  digitalWrite(d_red, LOW);
  digitalWrite(r_green, LOW);
  delay(5000);

  //DOWN LANE GO
  digitalWrite(u_yellow, LOW);
  digitalWrite(d_yellow, LOW);
  digitalWrite(r_yellow, LOW);
  digitalWrite(l_yellow, LOW);
  digitalWrite(u_red, HIGH);
  digitalWrite(l_red, HIGH);
  digitalWrite(r_red, HIGH);
  digitalWrite(d_green, HIGH);
  Serial.println("DOWN LANE GO");
  delay(10000);

  //ALL YELLOW
  digitalWrite(u_yellow, HIGH);
  digitalWrite(d_yellow, HIGH);
  digitalWrite(r_yellow, HIGH);
  digitalWrite(l_yellow, HIGH);
  digitalWrite(u_red, LOW);
  digitalWrite(l_red, LOW);
  digitalWrite(r_red, LOW);
  digitalWrite(d_green, LOW);
  delay(5000);

  //LEFT LANE GO
  digitalWrite(u_yellow, LOW);
  digitalWrite(d_yellow, LOW);
  digitalWrite(r_yellow, LOW);
  digitalWrite(l_yellow, LOW);
  digitalWrite(u_red, HIGH);
  digitalWrite(d_red, HIGH);
  digitalWrite(r_red, HIGH);
  digitalWrite(l_green, HIGH);
  Serial.println("LEFT LANE GO");
  delay(10000);
}