Koodka Arduino ee Module-ka Kontoroolka L9110 Dual DC Motor

/*
 * Display number on a seven-segment display with Arduino
 * Written by Ahmad Shamshiri for Robojax.com
Date modified: Jun 11, 2018 at 17:20 in Ajax, Ontario, Canada
Watch video instructions for this code: https://youtu.be/-g6Q9lSHDzg

Code is provided for free AS IS without warranty. 
You can share this code as long as you keep the above note intact.
 */

const int A1A = 2;//define pin 2 for A1A
const int A1B = 3;//define pin 3 for A1B

const int B1A = 8;//define pin 8 for B1A
const int B1B = 9;//define pin 9 for B1B




void setup() {
  pinMode(B1A,OUTPUT);// define pin as output
  pinMode(B1B,OUTPUT);
  
  pinMode(A1A,OUTPUT);
  pinMode(A1B,OUTPUT);    
  delay(3000);
}

void loop() {

  motorA('R');// Turn motor A to RIGHT
  delay(2000);
   motorA('L');// Turn motor A to LEFT
  delay(2000);   
  motorA('O');// Turn motor A OFF
  delay(2000); 
    
  motorB('R');// Turn motor B to RIGHT
  delay(2000);
   motorB('L');// Turn motor B to LEFT
  delay(2000); 
  motorB('O');// Turn motor B OFF
  delay(2000); 
   
  motorA('R');// Turn motor A to RIGHT
  motorB('R'); // Turn motor A to RIGHT 
  delay(2000);
  motorA('L');// Turn motor A to LEFT
  motorB('L');// Turn motor B to LEFT     
  delay(3000);
  motorA('O');// Turn motor A OFF
  motorB('O');// Turn motor B OFF
  delay(5000);
   
}

/*
 * @motorA
 * Activation rotation of motor A
 * d is the direction
 * R = Right
 * L = Left
 */
void motorA(char d)
{
  if(d =='R'){
    digitalWrite(A1A,LOW);
    digitalWrite(A1B,HIGH); 
  }else if (d =='L'){
    digitalWrite(A1A,HIGH);
    digitalWrite(A1B,LOW);    
  }else{
    //Robojax.com L9110 Motor Tutorial
    // Turn motor OFF
    digitalWrite(A1A,LOW);
    digitalWrite(A1B,LOW);    
  }
}// motorA end


/*
 * @motorB
 * Activation rotation of motor B
 * d is the direction
 * R = Right
 * L = Left
 */
void motorB(char d)
{

    if(d =='R'){
      digitalWrite(B1A,LOW);
      digitalWrite(B1B,HIGH); 
    }else if(d =='L'){
      digitalWrite(B1A,HIGH);
      digitalWrite(B1B,LOW);    
    }else{
    //Robojax.com L9110 Motor Tutorial
    // Turn motor OFF      
      digitalWrite(B1A,LOW);
      digitalWrite(B1B,LOW);     
    }

}// motorB end