Re: Was Chopper circuit - Now ver 3.2, G298

Hi Tony,

I KNEW I'd heard of a project! Sound like you're way ahead of my PIC
project.

How do you intend to release it? As a kit, or do you intend to make the
source code, schematics and board layout available to to the list?

Mariss' new G298 board will probably fit in well with your efforts!

Alan KM6VV


Tony Jeffree wrote:

>
> At 23:14 09/04/2002 +0000, you wrote:
> >Just thinking; I recall someone on the list that has already replaced
> >the 'L297 with a PIC. And the PIC could be the heart of a single axis
> >"jogger", for a 4th axis rotary table, for example. Kinda like
> >Sherline's controller? (Bill's ears perk up). I don't know if it's any
> >cheaper, but some things like limit and E-stop switches could be built
> >in. Same for PAL (or eqv).
>
> Done that...I have an initial production run of single-axis
> PIC/L297/L298-based rotary table controllers in progress right now...am
> working on the documentation as we speak. Headline specs:
>
> -Will handle any drive ratio between 1:1 and 99:1 - software settable
> -Software settable motor current up to 2A/phase
> -Idle current can be set as up to 50% of the motor current
> -Supply voltage up to 40V
> -Jogs in increments of +- 1/100th, 1/10th, 1 or 10 degrees
> -Division mode handles all divisions from 1 to 999
> -Degrees mode handles any angular move in range 0.001 to 360.000 degrees
> -All moves calculated to the nearest 1/2 step - errors are evenly
> distributed to avoid cumulative errors creating the "thick or thin tooth"
> problem. Display shows desired position and actual angular position
> -Can be driven via external step-and-direction signals to use as a "true"
> 4th axis
> -Can be used to drive an external power stage via step-and-direction
> signals to allow higher power motors to be used
> -Controlled/configured via a 16-key keyboard & a 2-line by 16-char LCD display.
>
> Pics & fuller specs to follow...
>
> Regards,
> Tony