Bluetooth-Controlled Car with HC-05 Module

/*
 * Project Name: Bluetooth-Controlled Car with HC-05 Module
 * Designed For: Arduino Uno
 *
 *
 * License: GPL3+
 * This project is licensed under the GNU General Public License v3.0 or later.
 * You are free to use, modify, and distribute this software under the terms
 * of the GPL, as long as you preserve the original license and credit the original
 * author. For more details, see <https://www.gnu.org/licenses/gpl-3.0.en.html>.
 *
 * Copyright (C) 2025  Ameya Angadi
 *
 * Code Created And Maintained By: Ameya Angadi
 * Last Modified On: April 24, 2025
 * Version: 1.4
 *
 */

#define led1 = 13
#define in1 = 12
#define in2 = 11
#define in3 = 10
#define in4 = 9

void setup() {
  Serial.begin(9600);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(13, OUTPUT);
}

void loop() {
  if (Serial.available() > 0) {
    char inputvalue = char(Serial.read());
    if (inputvalue == 'F') {
      digitalWrite(12, HIGH);
      digitalWrite(11, LOW);
      digitalWrite(10, HIGH);
      digitalWrite(9, LOW);
    }
    else if (inputvalue == 'B') {
      digitalWrite(12, LOW);
      digitalWrite(11, HIGH);
      digitalWrite(10, LOW);
      digitalWrite(9, HIGH);
    }

    else if (inputvalue == 'R') {
      digitalWrite(12, LOW);
      digitalWrite(11, LOW);
      digitalWrite(10, HIGH);
      digitalWrite(9, LOW);
    }

    else if (inputvalue == 'L') {
      digitalWrite(12, HIGH);
      digitalWrite(11, LOW);
      digitalWrite(10, LOW);
      digitalWrite(9, LOW);
    }

    else if (inputvalue == 'C') {
      digitalWrite(12, LOW);
      digitalWrite(11, HIGH);
      digitalWrite(10, HIGH);
      digitalWrite(9, LOW);
    }

    else if (inputvalue == 'A') {
      digitalWrite(12, HIGH);
      digitalWrite(11, LOW);
      digitalWrite(10, LOW);
      digitalWrite(9, HIGH);
    }

    else if (inputvalue == 'O') {
      digitalWrite(13, HIGH);
    }

    else if (inputvalue == 's') {
      digitalWrite(13, LOW);
    }

    else if (inputvalue == 'S') {
      digitalWrite(12, LOW);
      digitalWrite(11, LOW);
      digitalWrite(10, LOW);
      digitalWrite(9, LOW);
    }
  }
}