Code for bluetooth car

 /*

   code started

   diy metal detector

   #define tx pin = rx;

   #define rx pin = tx;

   code created by technical ideas yt

   https://youtube.com/c/TechnicalidEas07

 */

int m1a = 4;

int m1b = 5;

int m2a = 6;

int m2b = 7;

char val;

void setup()

{

pinMode(m1a, OUTPUT);

pinMode(m1b, OUTPUT);

pinMode(m2a, OUTPUT);

pinMode(m2b, OUTPUT);

Serial.begin(9600);

}

void loop()

{

  while (Serial.available() > 0)

  {

  val = Serial.read();

  Serial.println(val);

  }

  if( val == 'F')

    {

      digitalWrite(m1a, HIGH);

      digitalWrite(m1b, LOW);

      digitalWrite(m2a, HIGH);

      digitalWrite(m2b, LOW);

    }

  else if(val == 'B')

    {

      digitalWrite(m1a, LOW);

      digitalWrite(m1b, HIGH);

      digitalWrite(m2a, LOW);

      digitalWrite(m2b, HIGH);

    }

    else if(val == 'L')

    {

    digitalWrite(m1a, LOW);

    digitalWrite(m1b, LOW);

    digitalWrite(m2a, HIGH);

    digitalWrite(m2b, LOW);

    }

    else if(val == 'R')

    {

    digitalWrite(m1a, HIGH);

    digitalWrite(m1b, LOW);

    digitalWrite(m2a, LOW);

    digitalWrite(m2b, LOW);

    }

  else if(val == 'S')

    {

    digitalWrite(m1a, LOW);

    digitalWrite(m1b, LOW);

    digitalWrite(m2a, LOW);

    digitalWrite(m2b, LOW);

    }

  else if(val == 'I')

    {

    digitalWrite(m1a, HIGH);

    digitalWrite(m1b, LOW);

    digitalWrite(m2a, LOW);

    digitalWrite(m2b, LOW);

    }

  else if(val == 'J')

    {

    digitalWrite(m1a, LOW);

    digitalWrite(m1b, HIGH);

    digitalWrite(m2a, LOW);

    digitalWrite(m2b, LOW);

    }

   else if(val == 'G')

    {

    digitalWrite(m1a, LOW);

    digitalWrite(m1b, LOW);

    digitalWrite(m2a, HIGH);

    digitalWrite(m2b, LOW);

    }

  else if(val == 'H')

    {

    digitalWrite(m1a, LOW);

    digitalWrite(m1b, LOW);

    digitalWrite(m2a, LOW);

    digitalWrite(m2b, HIGH);

    }

}