const int stepPin = 3;     
const int dirPin = 2;       
const int potPin = A0;      

void setup() {
  pinMode(stepPin, OUTPUT);  
  pinMode(dirPin, OUTPUT);   
  Serial.begin(9600);        
}

void loop() {
  int potValue = analogRead(potPin); 
  int speed = map(potValue, 0, 1023, 500, 100);  
  if (potValue < 512) {
    digitalWrite(dirPin, LOW);
  } else {
    digitalWrite(dirPin, HIGH);
  }
  
  digitalWrite(stepPin, HIGH);
  delayMicroseconds(speed);
  digitalWrite(stepPin, LOW);
  delayMicroseconds(speed);
  Serial.print("Potentiometer Value: ");
  Serial.print(potValue);
  Serial.print("Speed (ms per step): ");
  Serial.println(speed);
}