> -----Original Message-----
> From: Jan-erik S=F6derholm (QAC) [SMTP:Jan-erik.Soderholm@PAC.ERICSSON.SE]
> Sent: Tuesday, April 29, 2003 4:12 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: PC mouse optical detectors.
>=20
> Yes, but then I'd expect *two* pins beeing
> connected to the IC , not ?
>=20
> As I said :
> one pin to GND (black lead in the cable)
> one pin to power (read lead in the cable, via an (common) inductor)
> one pin to the IC
>=20
> And the two first pins from each of the three sensors are
> tied together (directly, via the PCB). The third pin from
> each sensor is connected to three different pins on the IC.
>=20
> Jan-Erik.
>=20
If this is correct then there must be some decoding logic built into the
detectors as you suggested.  Do you have a scope to check the third pin
with?  My guess would be some kind of pulse width encoding: i.e. short pulse
=3D one step forward, long pulse =3D one step back.

Regards

Mike


=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
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=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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