/*
  Stepper tracks pot
  The position of the stepper matches the degree of the pot.
*/

#include <AccelStepper.h>

const int ANALOG_IN = A0;
const int DIR_PIN = 2;
const int STEP_PIN = 3;

AccelStepper stepper(AccelStepper::DRIVER, STEP_PIN, DIR_PIN);

void setup()  {
  stepper.setMaxSpeed(1000);
}

void loop() {
  int val = analogRead(ANALOG_IN);
  int mappedVal = map(val, 0, 1023, -75, 75); // 75 * 1.8 deg/step = +/-135°
  stepper.moveTo(mappedVal);
  stepper.setSpeed(100);
  stepper.runSpeedToPosition();
}