Smartphone Bluetooth Controlled Robotic Car with L298N & Arduino

/*
 * Project: Smartphone Bluetooth Controlled Robotic Car
 * Author: ElectronLab STEM Curriculum
 * Target: Arduino Uno + L298N + HC-05
 */

// L298N Control Pins
const int IN1 = 5;
const int IN2 = 6;
const int IN3 = 9;
const int IN4 = 10;

char command = 'S'; // Default state is Stop

void setup() {
  // Start Serial at Bluetooth default baud 9600
  Serial.begin(9600);
  
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);
  pinMode(IN3, OUTPUT);
  pinMode(IN4, OUTPUT);
  
  stopCar();
}

void loop() {
  if (Serial.available() > 0) {
    command = Serial.read();
    
    switch (command) {
      case 'F': // Forward
        moveForward();
        break;
      case 'B': // Backward
        moveBackward();
        break;
      case 'L': // Turn Left
        turnLeft();
        break;
      case 'R': // Turn Right
        turnRight();
        break;
      case 'S': // Stop
      default:
        stopCar();
        break;
    }
  }
}

void moveForward() {
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
}

void moveBackward() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
}

void turnLeft() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);
}

void turnRight() {
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);
}

void stopCar() {
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
}