Motor Stepper Example

[HenrikOlsson]

Hi,
First off all, that motor is an unipolar motor with a single common connection for both windings, it can not be driven by a L298.
The documentation for that motor isn't really that great. It looks like there's a gearbox on the motor but I can't figure out if the stated step angle of 5.625° includes the gearbox, if there is one. If 5.625° includes the gearbox then you won't be able to get 1° resolution. Fullstep would give you 5.625°, halfstep 2.8125°.

Finally this is a forum for PBP, most of us don't do C so if you're looking for that you're in the wrong place basically.

[astanapane]

Hi all,

long time no see, because i'm o the business trip and really didnt have a time to meet you.

I have a question.

First of all i havent open a new thread because it is already one here.

Now let me explain you what i would like to do.

I have the following parts in my lab and would like to do some experiments. Simple not very difficult in the begining.

1) Big Easy Driver
2) Stepper Motor with Cable

Then to control the easy driver i have a pic16f88. I hope that is enough or do i need a bigger microcontroller with 4 different ports?

I understand that i need to connect from the controller to the Big Easy Driver 3 pins.

The GND, the STEP, and the DIR.

My question is: The step has to be a PWM signal? The direction pin is only high or low?

It is would be nice if anyone has a similar questions and will discuss several options.

i just want to give to the stepper motor a simple directions and basic step rotation....not microstep. I know that i can do with the Big easy driver, but i would like to start from the very basics.

thanks a lot for any help in advance.

regards,

[aratti]

Hi astanapane, pic16f88 is more then you need to make your motor turn CW and CCW. Just connect two digital outputs plus the ground to your big easy driver and you are done. Have the pin connected to step toggling with a pause in between shorter is the delay faster the motor will run. Pull high direction pin when you want invert the rotation.

That is all.

Cheers

Al.

[astanapane]

Thanks a lot for the reply. i will give it a little bit more time for searching what i need To do.
Actually i would like to see how i can give a single Step at a time by using pwm.
Appreciate your time.

[Ioannis]

Hi astanapane.

One pulse on STEP input moves motor one step only.

Ioannis

[astanapane]

Hi astanapane.

One pulse on STEP input moves motor one step only.

Ioannis

Hi Ioanni

I will do some tests on the Code and once i have some Good news i will let you Know.

At the moment I'm on the 3d design of the model. Actually i design a Base for the stepper Motor.

May i ask you something that might sound stupid?

On the Motor i have it is recognised as a 1.8 degree angle.

They do say that is a 200 step per revolution.

If i turn the axis by hand i feel the steps but as i measured is not more that 50 steps.

Am i right or what i try to count doesnt have to do anything corresponding to its operation and the 200 steps.

[Ioannis]

The actual steps have nothing to do with what your are feeling turning it by hand.

If you follow the step pulses then you will confirm the 1.8 degrees/step. With microstepping even less, but this is complicated for now.

Ioannis