Examine the mouse board to find the common pin then use 100k pull-ups (if
common was GND) or pull-downs (if the common was +Vcc). Also route each
output to a PIC input pin.

Peter

On Wed, 14 Aug 2002, Kevin A. Benedict wrote:

>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
>
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>
>
>

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