|
[DPRG] Encoders
Subject: [DPRG] Encoders
From: Dan Miner
miner at centtech.com
Date: Sat Sep 8 01:21:15 CDT 2001
Oops - I meant to send this to the list, not just Ed.
- DAn
> -----Original Message-----
> From: Dan Miner
> Sent: Saturday, September 08, 2001 1:19 AM
> To: 'Ed Okerson'
> Subject: RE: [DPRG] Encoders
>
>
> Ha! You're thinking the same way I was thinking 2 tears ago
> when I did the same thing. It turns out that the 2 pin device
> is (obviously) the LED and the 3 pin device is really TWO
> phototransisters placed at exactly the correct spacing to give
> a quadrature encoding for the given wheel. Try tracing out
> the signals on the board to determine if the device is common
> emitter or common collector. Actually, it's easiest to just
> hook up a scope while the thing is running.
>
> - Dan Miner
>
> > -----Original Message-----
> > From: Ed Okerson [mailto:eokerson at fw.telenic.net]
> > Sent: Friday, September 07, 2001 9:48 PM
> > To: 'DPRG List'
> > Subject: [DPRG] Encoders
> >
> >
> > OK, I've opened up three different mice. All of them only
> > have only one
> > led/phototransistor pair per encoder wheel. I'm stumped.
> > How do they know
> > which way the encoder is turning?
> >
> > Ed Okerson
> >
> > _______________________________________________
> > DPRGlist mailing list
> > DPRGlist at dprg.org
> > http://nimon.ncc.com/mailman/listinfo/dprglist
> >
>
More information about the DPRG mailing list
|
