// INCLUDES
#include <Stepper.h>

// CONSTANTS
const int SENSOR_PIN = A0;
const int MOTOR_PIN_1 = 9;
const int MOTOR_PIN_2 = 10;
const int MOTOR_PIN_3 = 11;
const int STEP_PIN = 12;
const int DIR_PIN = 7;
const int STEPS_PER_REVOLUTION = 800;

// VARIABLES
int sensorVal, motorSpeed;
Stepper myStepper = Stepper(STEPS_PER_REVOLUTION, STEP_PIN, DIR_PIN);

void setup() {
  
}

void loop() {
  // read sensor value and set motor speed
  sensorVal = analogRead(SENSOR_PIN);
  motorSpeed = map(sensorVal, 0, 1023, 600, 0);
  myStepper.setSpeed(motorSpeed);

  // step the motor forwards at the set speed
  myStepper.step(1);
}