// For: https://forum.arduino.cc/t/controlling-position-of-stepper-motor-without-limit-switches/1037813/
// This Wokwi project: https://wokwi.com/projects/344507517244539474

#include <Stepper.h>

const int pinLDR = A0;
const int hysteresis = 10;
bool alreadyRotated = false;          // true when rotated clockwise

const int stepsPerRevolution = 2048;  // change this to fit the number of steps per revolution
const int rolePerMinute = 17;         // Adjustable range of 28BYJ-48 stepper is 0~17 rpm

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


void setup()
{
  // initialize the serial port:
  Serial.begin(9600);

  myStepper.setSpeed(rolePerMinute);
}


void loop()
{
  int val = analogRead(pinLDR);         // define new variable
  if (val < (500 - hysteresis) && !alreadyRotated)
  {
    Serial.println("Clockwise");
    myStepper.step(stepsPerRevolution * 3);   // do the steps and wait until ready
    alreadyRotated = true;
  }
  else if (val > (500 + hysteresis) && alreadyRotated)
  {
    Serial.println("Counterclockwise");
    myStepper.step(-stepsPerRevolution * 3);
    alreadyRotated = false;
  }

  delay(500);                          // slow down the sketch
}