#include <Stepper.h>

const int stepsPerRevolution = 200; // Steps per turn
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11); // Wiring

int stepCount = 0;

void setup() {}

void loop() {
  // read the sensor value:
  int sensorReading = 256; // analogRead(A0);

  // map it to a range from 0 to 100:
  int motorSpeed = map(sensorReading, 0, 1023, 0, 100);

  // set the motor speed:
  if (motorSpeed > 0) {
    myStepper.setSpeed(motorSpeed);
    // step 1/100 of a revolution:
    myStepper.step(stepsPerRevolution / 100);
  }
}