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Just a note: Kevin, please don't use a reply-to address with your
piclist email.  It caused my reply to go straight to you, and not to
the list.  Many people on the list do not appreciate telling only one
person their answer.

Now back to my original message.
- ---

I assume that the mouse has two of these encoders, no?  If so, look
at the voltages on the still functioning encoder, and try to hack the
circuit out from there.

Also, I've been pretty sure that mice usually operate on two IR
LED/Phototransistor pairs.  So, each wheel has two sets, and they
produce a quadrature output when placed properly.  That will take
some adjusting to get it right.  Once you have a quadrature output,
you can either use a commercial quadrature decoder chip (eg. LS7084.
Go to www.chipcenter.com/questlink to find datasheets), or write your
own software to handle it.

- - ----- Original Message -----
From: "Kevin A. Benedict" <kben@dca.net>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Wednesday, August 14, 2002 11:34 AM
Subject: [PICLIST] [EE]: Mouse Encoder Circuit Question


> Hi,
>
> I am trying to hack a mouse encoder to use as a shaft
> encoder for a mobile robot. I removed the slotted wheel,
> IR LED, and what I assume is a photo-transistor from a mouse.
> The Phototransistor is housed in black plastic and
> has three leads. I was wondering if anyone could give me
> a circuit so I can interface the (photo-transistor ?) to
> a PIC. I want to power the IR Led and then use the int on
> change function of portb to record the pulses from the
> photo-transistor. ( It mat not be a photo-transistor,
> but that's my best guess)
>
> I have spent several hours searching the net for a circuit
> on how to do this, but no luck.
> Any help would be appreciated.
>
> Thanks,
> Kevin
>
> --
> http://www.piclist.com hint: To leave the PICList
> mailto:piclist-unsubscribe-request@mitvma.mit.edu
>

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