Hello Mike & PIC.ers,

>From:    mike bolton <Bolton@FS1.WITH.MAN.AC.UK>
>Subject: [EE]: mouse emulation
>
>Some while ago I designed a mouse emulator for use by a severely
>disabled programmer. He had no hand use but could operate a joystick
..
<snippo>
..
>In response to my previous mailing, is there no-one out there who has
>used a PIC for closed-loop motor speed control?

..
I've done this quite a bit.
Generally, I've had to close the loop with motors of ~0.5 kW size,
either 200vdc shunt, or 3ph AC induction types.
The actual drives are usually bought-in units -there are plenty of
suppliers at competitive prices.

Speed sensing by slotted opto-coupler, in the old days.
Now I use Hall-Effect magnetic sensors with a magnet or two mounted
on the rotating shaft.  These are a lot less subject to variations
in sensing distance, dust, muck, etc.

Rather than clod the piclist with BW, email me off-list if you
want more.


        best regards,   John


>
>Mike Bolton
>
>
>
>Dr Mike Bolton
>Clinical Engineering


e-mail from the desk of John Sanderson, JS Controls.
Snailmail:          PO Box 1887, Boksburg 1460, Rep. of South Africa.
Tel/fax:            Johannesburg  893 4154
Cellphone no:   082 741 6275
email:                jsand@pixie.co.za
Manufacturer & purveyor of laboratory force testing apparatus, and related
products and services.

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