Simple stepper movements

[laurynas...@gmail.com]

Hello,

 I am beginner. So I started to experiment with arduino and accelstepper library and just want to make simple movements with stepper motor (28BYJ-48). I want  Stepper to move 500 positions forward, than back to 0, then forward to 300. I started trying to make stepper move 500 forward with this code:

void setup()

{  

  // Change these to suit your stepper if you want

  stepper.setMaxSpeed(2000);

  stepper.setAcceleration(20);

  

}

void loop()

{

stepper.moveTo(500);

    stepper.run();

This is fine. Stepper rotates to 500 and stops. I add another part of code and this working fine. stepper rotates back to 0:

   stepper.setMaxSpeed(2000);

  stepper.setAcceleration(20);

    stepper.moveTo(0);

    stepper.run();

But when I add third part of code the stepper is not working as supposed to. It will rotate 500, then stops and start rotate very slowly. What is happening? I just added the similar part of code, only with other numbers.  There is the whole code:

void setup()

{  

  // Change these to suit your stepper if you want

  stepper.setMaxSpeed(2000);

  stepper.setAcceleration(20);

   

}

void loop()

{

stepper.moveTo(500);

    stepper.run();

    

      stepper.setMaxSpeed(2000);

  stepper.setAcceleration(20);

    stepper.moveTo(0);

    stepper.run();

    

          stepper.setMaxSpeed(2000);

  stepper.setAcceleration(20);

    stepper.moveTo(300);

    stepper.run();

Thank you for your help.

[Sandy Noble]

Hi, run() itself will only ever take one step, so it needs to be in its own loop to make much sense:

void loop()

{

  stepper.moveTo(500);  // set target forward 500 steps

  while (stepper.distanceToGo() != 0) 

  {  stepper.run(); }

  stepper.moveTo(0);  // set target back at start position

  while (stepper.distanceToGo() != 0) 

  {  stepper.run(); }

  stepper.moveTo(300); // set target forward 300 steps

  while (stepper.distanceToGo() != 0) 

  {  stepper.run(); }

}

So the above will move 

forward 500 steps, 

backwards 500 steps, 

forward 300 steps,

forward 200 steps

backwards 500 steps

forward 300 steps

and on and on

sandy

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Sandy Noble

[laurynas...@gmail.com]

[laurynas...@gmail.com]

Thank you for quick response. It works now. But  know I want to add another stepper and move them simultaneously in the same order.. When I add part code with other stepper, the code runs first stepper, and than another stepper (code below).  How to run both at the same time?

void loop()

{

  stepper.moveTo(500);  // set target forward 500 steps

  while (stepper.distanceToGo() != 0) 

  {  stepper.run(); }

  

  stepper2.moveTo(500);  // set target forward 500 steps

  while (stepper2.distanceToGo() != 0) 

  {  stepper2.run(); }

}

;

[Sandy Noble]

The examples that Mike packages along with Accelstepper show this stuff fairly well, but this: 

void loop()

{

  stepper.moveTo(500);  // set target forward 500 steps

  stepper2.moveTo(500);  // set target forward 500 steps

  while (stepper.distanceToGo() != 0 || stepper2.distanceToGo() != 0) 

  {

    stepper.run();

    stepper2.run(); 

  }

}

Will do it.  Cycling through the run loop as long as either stepper still have a distance to go.

sn

[laurynas...@gmail.com]

That is great! Thank you.

[Jose Chacon]

thanks Sandy