const int MOTOR_FORWARD = 18;
const int MOTOR_BACKWARD = 19;

void setup() {
  Serial.begin(9600);
  
  while (!Serial && millis() < 3000) {
    delay(10);
  }

  pinMode(MOTOR_FORWARD, OUTPUT);
  pinMode(MOTOR_BACKWARD, OUTPUT);

  Serial.println("!!! SYSTEM ONLINE !!!");
  Serial.println("RC Car Control - Enter commands:");
  Serial.println("  F or f = Forward");
  Serial.println("  B or b = Backward");
  Serial.println("  S or s = Stop");
}

void loop() {
  if (Serial.available() > 0) {
    char command = Serial.read();
    
    if (command == 'F' || command == 'f') {
      Serial.println("Command: FORWARD");
      digitalWrite(MOTOR_FORWARD, HIGH);
      digitalWrite(MOTOR_BACKWARD, LOW);
    }
    else if (command == 'B' || command == 'b') {
      Serial.println("Command: BACKWARD");
      digitalWrite(MOTOR_FORWARD, LOW);
      digitalWrite(MOTOR_BACKWARD, HIGH);
    }
    else if (command == 'S' || command == 's') {
      Serial.println("Command: STOP");
      digitalWrite(MOTOR_FORWARD, LOW);
      digitalWrite(MOTOR_BACKWARD, LOW);
    }
  }
}