Re: [Sdcc-user] External interupt

[Hoeben E. <in...@ho...>]

Hi,

I have built several stepper motor ciscuits. I need more
to give a good answer:

- do you want them to have a controlled ac(de)celeration
  (ramp up/down), or just on/off, and
- do you want to run them both on different speeds at the
  same time, and
- do you want to control the coils directly or do you use
  a stepper motor driver and/or controller?

You could build a very simple a/d convertor with the RC by
switching an output and measuring how long it takes before
an input switches on/off due to the delay. It is not linear
however.

The control of the stepper motor can easily be done with
fast interrupts.

Regards,

Pieter Hoeben
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> DDonXNET schreef:
> Hi ,
> Sorry if I'm bothering you but please be so kind to give me a hint !
> I want to control 2 stepper motors and I want to modify their speed
> of rotation using an RC constant (an potentiometer and capacitor).
> I was thinking to use an external interupt.
> It is possible ?
> If Yes could give me some source of information ?
> (about microcontroller 8051 and interupts)
> An example would be excellent !
> Or other place to ask this question ...
> Thanks, Daniel