const int LEFT_GREEN_PIN = 2;
const int LEFT_YELLOW_PIN = 3;
const int LEFT_RED_PIN = 4;

const int RIGHT_GREEN_PIN = 5;
const int RIGHT_YELLOW_PIN = 6;
const int RIGHT_RED_PIN = 7;

void setupPins() {
  pinMode(LEFT_GREEN_PIN, OUTPUT);
  pinMode(LEFT_YELLOW_PIN, OUTPUT);
  pinMode(LEFT_RED_PIN, OUTPUT);
  pinMode(RIGHT_GREEN_PIN, OUTPUT);
  pinMode(RIGHT_YELLOW_PIN, OUTPUT);
  pinMode(RIGHT_RED_PIN, OUTPUT);
}

void leftGreenRightRed() {
  digitalWrite(LEFT_GREEN_PIN, HIGH);
  digitalWrite(LEFT_YELLOW_PIN, LOW);
  digitalWrite(LEFT_RED_PIN, LOW);
  digitalWrite(RIGHT_GREEN_PIN, LOW);
  digitalWrite(RIGHT_YELLOW_PIN, LOW);
  digitalWrite(RIGHT_RED_PIN, HIGH);
  delay(5000);
}

void leftYellowRightRed() {
  digitalWrite(LEFT_GREEN_PIN, LOW);
  digitalWrite(LEFT_YELLOW_PIN, HIGH);
  digitalWrite(LEFT_RED_PIN, LOW);
  digitalWrite(RIGHT_GREEN_PIN, LOW);
  digitalWrite(RIGHT_YELLOW_PIN, LOW);
  digitalWrite(RIGHT_RED_PIN, HIGH);
  delay(2000);
}

void leftRedRightGreen() {
  digitalWrite(LEFT_GREEN_PIN, LOW);
  digitalWrite(LEFT_YELLOW_PIN, LOW);
  digitalWrite(LEFT_RED_PIN, HIGH);
  digitalWrite(RIGHT_GREEN_PIN, HIGH);
  digitalWrite(RIGHT_YELLOW_PIN, LOW);
  digitalWrite(RIGHT_RED_PIN, LOW);
  delay(5000);
}

void leftRedRightYellow() {
  digitalWrite(LEFT_GREEN_PIN, LOW);
  digitalWrite(LEFT_YELLOW_PIN, LOW);
  digitalWrite(LEFT_RED_PIN, HIGH);
  digitalWrite(RIGHT_GREEN_PIN, LOW);
  digitalWrite(RIGHT_YELLOW_PIN, HIGH);
  digitalWrite(RIGHT_RED_PIN, LOW);
  delay(2000);
}

void setup() {
  setupPins();
}

void loop() {
  leftGreenRightRed();    // Ampel LEFT: Grün, Ampel RIGHT: Rot
  leftYellowRightRed();   // Ampel LEFT: Gelb, Ampel RIGHT: Rot
  leftRedRightGreen();    // Ampel LEFT: Rot, Ampel RIGHT: Grün
  leftRedRightYellow();   // Ampel LEFT: Rot, Ampel RIGHT: Gelb
}