// STM32 Traffic Lights Simulator
// Green  = 3 seconds
// Orange = 2 seconds
// Red    = 4 seconds

const int GREEN_LIGHT_PIN = PA5;
const int ORANGE_LIGHT_PIN = PA6;
const int RED_LIGHT_PIN = PA7;

const int GREEN_DURATION = 3000;
const int ORANGE_DURATION = 2000;
const int RED_DURATION = 4000;

void setup() {
  pinMode(GREEN_LIGHT_PIN, OUTPUT);
  pinMode(ORANGE_LIGHT_PIN, OUTPUT);
  pinMode(RED_LIGHT_PIN, OUTPUT);

  Serial.begin(115200);
  Serial.println("STM32 Traffic Lights Simulator");

  turnOffAllLights();
}

void loop() {
  showGreenLight();
  delay(GREEN_DURATION);

  showOrangeLight();
  delay(ORANGE_DURATION);

  showRedLight();
  delay(RED_DURATION);
}

void turnOffAllLights() {
  digitalWrite(GREEN_LIGHT_PIN, LOW);
  digitalWrite(ORANGE_LIGHT_PIN, LOW);
  digitalWrite(RED_LIGHT_PIN, LOW);
}

void showGreenLight() {
  digitalWrite(GREEN_LIGHT_PIN, HIGH);
  digitalWrite(ORANGE_LIGHT_PIN, LOW);
  digitalWrite(RED_LIGHT_PIN, LOW);
  Serial.println("Green light ON");
}

void showOrangeLight() {
  digitalWrite(GREEN_LIGHT_PIN, LOW);
  digitalWrite(ORANGE_LIGHT_PIN, HIGH);
  digitalWrite(RED_LIGHT_PIN, LOW);
  Serial.println("Orange light ON");
}

void showRedLight() {
  digitalWrite(GREEN_LIGHT_PIN, LOW);
  digitalWrite(ORANGE_LIGHT_PIN, LOW);
  digitalWrite(RED_LIGHT_PIN, HIGH);
  Serial.println("Red light ON");
}