Re: Can I Add another device by soldering it inside?
From: Joel Kolstad (JKolstad71HatesSpam_at_Yahoo.Com)
Date: 11/03/04
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Date: Wed, 3 Nov 2004 12:18:32 -0800
"asdf" <a@a.v> wrote in message news:cmb60g$7qo$1@fegnews.vip.hr...
> I hope someone would be able to help :) I want to add one smal device to
> my
> computer by soldering it to the inside of the USB connector. If I do so,
> would I stil be able to use this same connector from the outside, in the
> regular way?
No. A USB connector can only connect to one device at a time; connecting to
multiple devices requires significantly non-trivial electronics. If you
open up a USB hub you'll see it contains an IC that performs this
functionality. Although (for USB 1.x) the _signal lines_ are more or less
just 'repeated' between all devices, a hub must be intelligent so that the
host can tell it to 'power up' one device at a time for enumeration.
Afterwards, the host polls the hub so that it can detect device removal,
overcurrent conditions, etc.
> I have a small USB dongle (BLuetooth) that I would like to "install" into
> my
> notebook. When used as a dongle, Bluetooth is constant source of the
> problems: I must pair it often or I do not have it with me when I need it.
Why do you think that connecting it inside of your laptop is going to help
this problem in any manner?
> Can this be done and stil retain usage of such USB port from the outside
> or
> I could not connect any other devices on the outside while this "inside"
> Bluetooth dongle is active or I could never use external part of the
> connector?
You have a few options:
1) Get the smallest hub you can find -- some are very tiny -- and install
that as well inside the laptop. Be sure to get one that allows external
power to be used, as otherwise the 'new' external connection will
(typically) only tell the OS that 100mA of power is available.
2) Connect the D+/D-, and Gnd lines to your dongle and use a SPDT switch to
alternatively powerup the dongle's +5V line or the external connector's +5V
line. This violates the USB spec and no one would guarantee you that it
will work, but there's a decent change that it would.
---Joel Kolstad
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