Rotation Counter
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Subject Author Date
Rotation Counter kitmor 08-13-2005
Posted by kitmor on August 13, 2005, 11:59 pm
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Hi all,
I was wondering how I make a simple rotation counter for a modified
servo.
--kit


Posted by D Herring on August 14, 2005, 3:14 am
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> I was wondering how I make a simple rotation counter for a modified
> servo.

What you probably want is a rotary encoder (shaft encoder). These are
readily available devices, or you can make your own out of slotted disks
and photo-diode/transistor pairs. Either way, the support circuitry is
rather simple.

These pages might get you started:
http://www.faqs.org/docs/electric/Digital/DIGI_11.html
http://ww1.microchip.com/downloads/en/AppNotes/00718a.pdf
http://www.interq.or.jp/japan/se-inoue/e_ckt10_3.htm
http://www.circuitcellar.com/library/print/0303/millier152/index.htm

If all you need is a count of revolutions, then a single slot would be
all you need. Another technique is to put a cam on the shaft and
position a roller microswitch to register the revolutions.

Hope that helps,
Daniel

Posted by ian dobson on August 14, 2005, 11:12 am
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Hi,

Have a look at the inards of an old mouse (the ones with a ball), I've used
one for a simple rotation counter.


Regards
Ian Dobson

Home of the Atmel based UDP mobile web cam http://www.planet-ian.com
All mails scanned with av-filter.pl (F-Prot / perl)

> Hi all,
> I was wondering how I make a simple rotation counter for a modified
> servo.
> --kit
>



Posted by kitmor on August 14, 2005, 11:34 pm
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Hi,
I went the microswitch route since I had one hanging around. I just
screwed a screw into the shaft then glued on a switch. So now I have a
reliable rotation counter.
Thanks for all the Ideas
--Kit


Posted by Padu on August 15, 2005, 12:38 pm
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"kitmor"
> Hi,
> I went the microswitch route since I had one hanging around. I just
> screwed a screw into the shaft then glued on a switch. So now I have a
> reliable rotation counter.
> Thanks for all the Ideas
> --Kit
>

Just keep in mind that with the microswitch you have no means to know which
direction you're rotating, which could be fine for a myriad of applications.

Padu



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