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> Question Abt. Japanese Page Re Bluetooth Mod
daniel3000
post Mar 14 2007, 12:32 AM
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Hi huys.

I'm considering to upgrade my Zauri with USB Bluetooth modules.
Since I want to keep the hardware compatible with standard kernels and don't want to do too many modifications to the hardware, I'm looking into the simple solution:
Take a normal USB BT module, connect it 1:1 to the USB port with a power switch, which will probably be blocking the USB port when BT is used. This limitation is okay with me.

I think this method is described here:
http://www.piro.hopto.org/~piro/pukiwiki/p...%A2%B2%BD%5D%5D

But since I cannot read any Japanese, would anyone able to read that please let me know how the switch must be connected?
From the pics it seems the switch only switches one line. But which one?
Is it really enough to switch only one line (probably one of the power lines)?
When the data lines are still co nnected to the BT module, can other USB devices which are attached in a normal way to the USB port still work without a problem?


Once I know all this, I will begin with the surgery and take some better pictures to put them onlilne.
I think this is a great way of enhancing the functionality of a Zaurus!

aTdHvAaNnKcSe
daniel
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albertr
post Mar 18 2007, 07:00 PM
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From my short experience with wiring USB modules to Zaurus, pelrun is absolutely right - ground line needs to be disconnected (not just 5V line). If you will keep ground connected to both modules, it would leak too much current on usb data lines.
-albertr
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daniel3000
post Mar 19 2007, 01:00 AM
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QUOTE(albertr @ Mar 19 2007, 05:00 AM)
From my short experience with wiring USB modules to Zaurus, pelrun is absolutely right  - ground line needs to be disconnected (not just 5V line). If you will keep ground connected to both modules, it would leak too much current on usb data lines.
-albertr
*


Okay, so I should probably switch all five USB lines (or at least four of them, leaving only GND connected to the module, so switching the three other lines to the module and the GND-ID connection).

I'm now looing into Photomos relays for this task.
Of course I could wire four micro switches to the outside, but that seems inconvenient to use. instead, just one switch switching power to the Photomos releays would be more convenient.

However, the only suitable photomos relays (from the electric specs) are quite large... Small SMD ones only have one relay, so four small ones would be needed. Also, the resistance of the sall ones is not acceptable. The large ones have two relays in one piece and a lower resistance...


Albertr or others, do ou have any experiences with such components?

Thanks
daniel
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