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

Hi,

> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of docstein99
>
> I got the 555 timer chip to work, and it works real good. It will
> ramp automatically, by way of the trim pot.
>
> Ideally, yes it would be nice to set it to a specific rate and press a
> button to ramp up & down.
>
> I'm using the atmega8 chips, in C language. If there is code or links
> I would appreciate those too, thanks!

If you join the Eleadscrew group,

http://groups.yahoo.com/group/E-LeadScrew/

You'll find the source code for the first Rev of the ELS proving the
concept and allowing a wide range of step rates inside the interrupt
routine along with acceleration code. It's for a PIC but should be easy
enough to port to the atmega8. The only down side is then you're
required to post the ported code as per GNU license.

Truthfully, though, the analog solution with a 555 timer as a step rate
into the driver is a pretty easy solution. The down side is you have to
use the speed control knob to accelerate and decelerate the frequency to
get fast speeds but for turning you're not really doing fast speeds.

John Dammeyer