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PICList Thread
'optical rotary encoders with PICs : The final Word'
1997\01\22@105203 by Anson Chuang

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Dear All,

Thank you for all your help with this. I do have faith!

Anyway, to sum up. I haven't been able to find optical encoders in the UK
for less than 35 pounds. However, I am now using a Bourns mechanical
quadrature encoder from Farnell which is relatively cheap at 3 pounds.
Cirkit doesn't stock Bourns anymore.

Thanks to some edge detection code, I am now Sorted!

Anson Chuang

1997\01\22@121655 by Octavio Nogueira

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> Anyway, to sum up. I haven't been able to find optical encoders in the UK
> for less than 35 pounds. However, I am now using a Bourns mechanical
> quadrature encoder from Farnell which is relatively cheap at 3 pounds.
> Cirkit doesn't stock Bourns anymore.
>
> Thanks to some edge detection code, I am now Sorted!
>
> Anson Chuang

Hi, I'm following this discution and did anyone have ever used Step Motor
as shaf encoder? I did a small test and it works very fine.

Octavio
========================================================
Octavio Nogueira
e-mail:   spam_OUTnogueiraTakeThisOuTspammandic.com.br
homepage: www.geocities.com/SiliconValley/Pines/6902
voice/fax: +55 11 240-6474
"ProPic" The first Production PIC Programmer running in
Windows and under US$ 20.00.
========================================================

1997\01\24@164941 by myke predko

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How are they wired up?

myke
{Quote hidden}

"I don't do anything that anybody else in good physical condition and
unlimited funds couldn't do" - Bruce Wayne

1997\01\24@164941 by myke predko

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How are they wired up?

myke
{Quote hidden}

"I don't do anything that anybody else in good physical condition and
unlimited funds couldn't do" - Bruce Wayne

1997\01\25@195737 by Hamilton Feltman

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       Greetings;

       I once tried to use stepper motors as shaft encoders. I just had
comparators set so the hysteresis trip level was just enough to triger the
threshold and latch it into binary ( with positive feedback ). The problem
I was having was that you have got to turn the "pot" at least FOUR clicks
before a direction can be realized. The reason being, unlike optically
encoded predecessors a coil could go positive or negative DEPENDING on
which DIRECTION you came from. If someone has come up with a way, though ,
of course I would love to hear it  ;->
p.s You've got to at least try it, it's fun!

       Hamilton



At 04:45 PM 1/24/97 EST, you wrote:
>How are they wired up?
>
>myke
>>> > Anyway, to sum up. I haven't been able to find optical encoders in
the UK
{Quote hidden}

pots on
>>interactive exhibits, even the strongest most destructive child cant
>>seem to break them.
>>Paul Waterfield



|_  _  _ _
| )(_|( | ) @  s l i p . n e t
http://www.slip.net/~ham
http://www.mesaboogie.com

1997\01\27@061122 by Paul Waterfield

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>         Greetings;
>
>         I once tried to use stepper motors as shaft encoders. I just had
> comparators set so the hysteresis trip level was just enough to triger the
> threshold and latch it into binary ( with positive feedback ). The problem
> I was having was that you have got to turn the "pot" at least FOUR clicks
> before a direction can be realized. The reason being, unlike optically
> encoded predecessors a coil could go positive or negative DEPENDING on
> which DIRECTION you came from. If someone has come up with a way, though ,
> of course I would love to hear it  ;->
> p.s You've got to at least try it, it's fun!
>
>         Hamilton

This is similar to how I did it. Connect up two of the phases to
comparitors, remove the negative portion and feed into the PIC
Paul Waterfield
Exhibit designer
Techniquest
Stuart Street
Cardiff CF1 6BW
UK
T +44 (0) 1222 475 475
F +44 (0) 1222 482 517

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