Homebrew PCBs

On Sat, 11 Jun 2005 12:25:44 +0200, Robert Hedan  
<robert.hedan@...> wrote:

> Comments on that design please?  I see how to control direction and  
> steps,
> but what about speed?  Is it a matter of just sending the pulses quicker
> from the PIC?
> Robert
>


It's really simple, and not for microstepping, but that's fine for small  
machines like a drill.
I do want to have a chopper driver however, 'cause with threaded rod you  
need every RPM you can possibly get, and when you have a chopper already  
it is too easy to include microstepping not to do it.

Usually you have two inputs to a stepper motor controller, step and  
direction. If the frequency on step is increased it turns faster. Those  
two signals come out of the PC parallel port (in simple systems).


ST