#include <Stepper.h>

const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution for your motor

// Initialize the stepper library on pins 8 through 11:
Stepper myStepper(stepsPerRevolution, 8, 9, 10, 11);

const int potPin = A0; // the potentiometer is connected to analog pin A0
const int relayPin = 7; // the relay is connected to digital pin 7
int potValue = 0;  // variable to store the value coming from the potentiometer
int stepCount = 0; // number of steps the motor has taken

void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
  // initialize the serial port:
  Serial.begin(9600);
  // initialize the relay pin as an output:
  pinMode(relayPin, OUTPUT);
}

void loop() {
  // read the value of the potentiometer:
  potValue = analogRead(potPin);
  // map it to a range from 0 to 100:
  int motorSpeed = map(potValue, 0, 1023, 0, 100);

  // if the potentiometer reading is above a certain threshold, turn the relay on
  if (motorSpeed > 50) {
    digitalWrite(relayPin, HIGH);
  } else {
    digitalWrite(relayPin, LOW);
  }

  // set the motor speed based on the potentiometer:
  if (motorSpeed > 0) {
    myStepper.setSpeed(motorSpeed);
    // move a number of steps equal to the motorSpeed:
    myStepper.step(motorSpeed);
  }

  // print the potentiometer value and the motor speed to the serial monitor:
  Serial.print("Potentiometer Value: ");
  Serial.print(potValue);
  Serial.print("\t Motor Speed: ");
  Serial.println(motorSpeed);

  delay(10); // short delay to reduce noise
}