#include "AccelStepper.h"

AccelStepper stepper; // Defaults to AccelStepper::FULL4WIRE (4 pins) on 2, 3, 4, 5

unsigned int speed = 0;
unsigned int lastSpeed = 0;
const int start = 10;


void setup()
{
  stepper.setMaxSpeed(1000);
  stepper.setSpeed(400);

  pinMode(start, OUTPUT);

}

void loop()
{
  speed = map(analogRead(A0), 0, 1023, 0, 1000);

   if (lastSpeed != speed)
   stepper.setSpeed(speed);

   if (speed > 0)
  if (digitalRead(start) == LOW)
  {
  stepper.runSpeed();
  stepper.run();
  
  }
  else{
  stepper.stop();
  }
}