Make a Stepper turn clockwise and anti clockwise in a loop

Projects Programming
1

I'm trying to make a step motor turn clockwise and anti clockwise with an Arduino UNO and a Step motor 28BYJ-48 and its encoder, I'm using Arduino's code for reference

#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);

void setup() {
  // set the speed at 60 rpm:
  myStepper.setSpeed(60);
  // initialize the serial port:
  Serial.begin(9600);
}

void loop() {
  // step one revolution  in one direction:
  Serial.println("clockwise");
  myStepper.step(stepsPerRevolution);
  delay(500);

  // step one revolution in the other direction:
  Serial.println("counterclockwise");
  myStepper.step(-stepsPerRevolution);
  delay(500);
}

But for some reason, it doesn't go backwards, what could possibly be happening?

This is the way I wired the circuit

motor-28byj-48.png
motor-28byj-48.png536×1080 146 KB

2

What do you have between the Arduino and the stepper?

3

That's the code you need, how is it hooked up?

4

Set the steps per rev to 513 and RPM to 35 or less and try it. Also you may have to swap motor wires around to find a combo that works with stepper library.
Try this simple 4 step sketch without the stepper lib.

/* coilA pin 8 to pin 1 on ULN2003, pin 16 to pink
   coilB     9 to pin 2,                15     yellow
   coilC    10 to pin 3,                14     orange
   coilD    11 to pin 4,                13     blue

   type a number in top of serial monitor for steps per second,
    300 (35 RPM is about max and hit enter.
*/
byte stepNr [4] = {0x01, 0x02, 0x04, 0x08};
byte cntr = 0;
int stepsPerRev = 513, // 512 is not enough, 514 too many
    dlay = 85;

void setup()
{
  Serial.begin(9600);
  DDRB = 0x0F; // set pins 8,9,10,11 to OUTPUT
}

void loop()
{
  PORTB = stepNr[cntr & 0x3] & 0x0F;
  delay(dlay);
  cntr++; // use cntr-- for opposite direction
  if (Serial.available() > 0)
  {
    dlay = 1000 / Serial.parseInt();
    Serial.println(dlay);
  }
}