Ping-Pong with a DC motor & a pot

Projects Programming
6

Yes, if I run the code below, the motor runs as expected.
In one direct for 4 sec. then in the other for 4 sec.....

//Motor A 
int dir1PinA = 2;
int dir2PinA = 3; 
int speedPinA = 5;

unsigned long time; 
int speed; 
int dir; 

void setup () 
{
  pinMode (dir1PinA, OUTPUT); 
  pinMode (dir2PinA, OUTPUT); 
  pinMode (speedPinA, OUTPUT); 
  time = millis (); 
  speed = 200; 
  dir = 1;
} 

void loop () 
{
  analogWrite (speedPinA, speed); 
  
  // set direction 
  if (1 == dir) 
  {
    digitalWrite (dir1PinA , LOW); 
    digitalWrite (dir2PinA, HIGH); 
  } 
  else 
  {
    digitalWrite (dir1PinA, HIGH); 
    digitalWrite (dir2PinA, LOW); 
  } 
  
  delay(4000);
    if (1 == dir) 
      {dir = 0;} 
    else 
      {dir = 1;}
}

It's just the logic with the pot code that I can't figure out.