Alt-BEAM Archive

Message #06712



To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Wed, 13 Oct 1999 12:32:05 -0700
Subject: [alt-beam] Re: Phototransistor switch


Hi Phil,

The slotted type can be used for detecting "end of leg travel". The
reflective type used in some faxes to detect paper, could be used for line
following and edge detector applications. You can often find the slotted
photo interrupter in printers and older 514 disk drives as well the fax and
mouse you mentioned. Most use photo transistors for detectors and are
usable in SEs as was shown by Bob Shannon or as relatively insensitive PDs
as well by connecting the base-collector pins only.

While a non-contacting switch is great since it never wears out, it does
consume power even when the "switch" is not closed.
Typically the LED draws 10ma continuous but with a power supply > 4V, two
LEDs can be put in series to conserve power.

regards

Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411

> -----Original Message-----

> From: Phillip A. Ryals [SMTP:phillip@ryals.com]
> Sent: Wednesday, October 13, 1999 8:12 AM
> To: Beam@Sgiblab. Sgi. Com
> Subject: Phototransistor switch
>
> Hi everyone, I have an idea that I was hoping someone might be able to
> help
> me with. I work with fax machines, and I started noticing some of the
> switches that are used inside them.
>
> They use a Photodiode arrangement similar to a mouse. Basically an
> emitter
> and a detector.. when the path is interrupted, etc.
>
> I have a great supply of a switch harness from a particular fax that has a
> six-wire plug, and two of the "switches" connected to it with about 6
> inches
> or wire.
>
> My question, can we use this kinda thing for BEAM? I really want to use
> these switches for touch sensors - they have a small finger-like
> projection
> that's spring loaded. I'm just trying to figure out how you could
> implement
> them into a traditional BEAM circuit.
>
> btw, forgive me, my cicuit design skills are pretty raw. Hence, I need
> your
> help.
>
>
> Thanks tons,
> par
>



6713 Wed, 13 Oct 1999 13:13:28 -0700 (PDT) [alt-beam] Goldmine pagers beam@sgiblab.sgi.com PLA Turd What page are the pager motors that are for sale on?


=====

__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com



6714 Wed, 13 Oct 1999 13:18:25 -0700 (PDT) [alt-beam] BG motors for sale!! beam@sgiblab.sgi.com PLA Turd
Well if any one cares I got a small surplus of BG
motors for sale. They're $30US each and $1US S&H for
each motor.For a grand total of $31US for each motor
with S&H. You got to move now because I only got 20
of these left and when they're gone they're GONE!!!


If your interested just get back to me off list at
Mr_Roboto101@yahoo.com

=====

__________________________________________________
Do You Yahoo!?
Bid and sell for free at http://auctions.yahoo.com



6715 Wed, 13 Oct 1999 16:09:58 -0400 This list Beam@Sgiblab. Sgi. Com Phillip A. Ryals
> Has anyone noticed that the messages on this list get sent out of
sequence?
> According to the received date&time, I read messages from oldest to
newest.
> But for some reason, I find myself reading the answer to a question first,
> and the actual question later on.
>
> Just wondering what's going on...
>
>
>
> par
>

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