/*Example sketch to control a stepper motor with A4988 stepper motor driver,
  AccelStepper library and Arduino: continuous rotation.
  More info: https://www.makerguides.com */

// Include the AccelStepper library:
#include <AccelStepper.h>

#define dirPin 8
#define stepPin 9
#define motorInterfaceType 1

#define btn 4

AccelStepper stepper = AccelStepper(motorInterfaceType, stepPin, dirPin);

void setup() {
  Serial.begin(9600);
  stepper.setMaxSpeed(1000);
  pinMode(btn, INPUT_PULLUP);
}

int btn_current = 0;
int btn_previous = 0;
bool stepper_state = true;

String input_val;
int val = 0;

void loop()
{
  long distance = stepper.distanceToGo();
  long position = stepper.currentPosition();

  if (Serial.available())
    input_val = Serial.readString();

  if (val > 0)
    val = input_val.toInt();

  if (stepper.distanceToGo() == 0)
  {
    // Random change to speed, position and acceleration
    // Make sure we dont get 0 speed or accelerations
    stepper.moveTo(rand() % 200);
    stepper.setMaxSpeed(1000);
    stepper.setAcceleration((rand() % 200) + 1);
  }

  btn_current = digitalRead(btn);
  if (btn_current == 0 && btn_previous == 1) {
    stepper_state = !stepper_state;
  }

  btn_previous = btn_current;

  if (stepper_state) {
    stepper.run();
  } else {
    stepper.stop();
  }


  Serial.print("distance: " + String(distance));
  Serial.println(" position: " + String(position));
}