Re: [CAD_CAM_EDM_DRO] Re: mouse encoder

Hi Tony,

Thanks for the details. I have one of Dan's tachs, but found the
reflective sensor to be a problem in my environment (only limited
testing). I hadn't thought of using slotted IR sensor, I have some,
might give it a try. You say you need a different version of
interface? Or that you can accommodate both? I'll have to give it a
try.

Be sure and post the magazine's publication date, although I suspect it
will be difficult to get single copies!

Which PIC did you say you used? Sold separately? And did you program
in assembly or 'C'? (BASIC?).

Hope you do well on the kit sales.

Alan KM6VV


Tony Jeffree wrote:

>
> At 01:12 22/08/2001 +0000, you wrote:
> >Nice work! Are you going to sell these? I'm curious about the sensor
> >you used, and the circuitry, a PIC? Perhaps you'd share them with us
> >(if you're not planing to sell them!)?
>
> Alan -
>
> Thanks.
>
> I plan to sell the meter in kit form as an accompaniment to an article in
> Model Engineers' Workshop, so the schematic will be published in the
> article. The kit will include a pre-programmed PIC.
>
> The circuit is designed for use with two alternative sensors - one is a
> reflective IR sensor, good for about 500 pulses per second, the other is a
> slotted IR sensor, good for much higher pulse rates.
>
> The meter can handle 1, 6 or 60 pulses per rev (i.e., 1, 6 or 60 slots in
> the sensor disc, or black/white marks on a shaft). I have tested the meter
> with the slotted sensor and the 60-slot disc up to 14,000 RPM (the max I
> can get out of my Taig mill/Sherline motor combination); with a 1-slot disc
> this would make the meter capable of reading up to 840,000 RPM. However, I
> believe that the sensor/meter combination is capable of handling higher
> pulse rates - I just haven't yet pushed it to the limit. The sampling
> period is 1 second, so a 60-slot disc gives measurements down to 1 RPM.
>
> Regards,
> Tony