Re: [CAD_CAM_EDM_DRO] Re: Stepper controller / driver for powerfeed

----- Original Message -----
From: "Stephen Wille Padnos" <spadnos@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Monday, October 01, 2007 5:08 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Stepper controller / driver for powerfeed


> You can do a ramp with the 555. You need a relatively large resistor
> and capacitor to do it (since the time constant needs to be around the
> ramp time you want, likely in seconds.)
>
> I don't know the specific circuit to do this off the top of my head, but
> it's possible and shouldn't take too many extra parts.
>
> If you need some AVR code, let me know which chip you may use. The code
> is pretty straightforward, especially for chips with the advanced PWM
> generator (mostly the megas, but maybe some tinys as well).
>
> - Steve
>
> docstein99 wrote:
>
> >I'm going to run some tests with the 555 timer. Though it doesn't
> >support ramping, I'm not sure I need. It looks like a few components.
> > This may just hold me over until I figure out coding an AVR.
> >
>
>
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