const int Speed = A0;
const int stepPin = 9;
int state = 0;
const int maxSpeed = 1000;
const int minSpeed = 10;

void setup() {
  //Serial.begin(115200);
  // Set the step and direction pins as output pins
  pinMode(Speed, INPUT);
  pinMode(stepPin, OUTPUT);
}
void loop()
{
  int speed = analogRead(Speed);
  // Map the input voltages to motor speed and direction
  speed = map(speed, 0, 1023, minSpeed, maxSpeed);
  if (state == 0)
  {
    analogWrite(stepPin, 255);
    state = 1;
  }
  else if (state == 1)
  {
    digitalWrite(stepPin, LOW);
    state = 0;
  }
  delayMicroseconds(speed);
}