RE: IR Tx/Rx

["Ian Lowe" <ian@xxxxxxx>]

Shudder. Thats all I am saying right now. Circuit has ben working fine in place, but the concept of one of my tech-friends plugging their laptop into the wrong CAT-5 socket, and setting the house on fire is not an image which will go away quickly!! I reckon my best approach is to use two inline fuses, one each for 12V and 5V. I reckon 100mA for the 5V line, and about the same for 12V. feel *much* safer now, having thought this through.

 

alhough, I have just disconnected my IR circuit till I can get into Craplins :

 

Thanks Keith!

-----Original Message-----
From: Keith Doxey [mailto:lists.diyha@xxxxxxx]
Sent: 22 February 2002 22:58
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] IR Tx/Rx

Ian(s) {Lego and Board} and all

 

IF you draw power from a PC power connector you MUST fit inline fuses, especially if you are going to feed it over CAT5.

 

CAT5 cable has a maximum current rating of around 250-350mA.

Modern PC power supplies are capable of supplying in EXCESS of 40A @ 5V.

 

THIS IS ENOUGH TO START FIRES !!!!

 

Not only will a suitable fuse protect your PC from external damage, it could also save your house. The PC power supply would only shut down (or blow up) in the event of attempting to draw more current than it was capable of supplying. Anything below that level and it will happily supply it irrespective of the cables ability to safely carry that level of current.

 

Keith

 

 

-----Original Message-----
From: Ian Lowe [mailto:ian@xxxxxxx]
Sent: 22 February 2002 22:32
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] IR Tx/Rx

Ahhhh. This circuit is *not* powered from the Serial Port (although the
original UIRT was) My version of the circuit is powered by a Y-Splitter
Power Cable on one of the Hard Drives in the server...

Extra useful because it provides +5 for the UIRT and +12 for the IR Bus,
although extra nervous-inducing when testing new modules. probably don't
want to fry my PC PSU!

The circuit I supplied to you is the highest res on the net, lifted from the
site of the guy who came up with the mod to the original UIRT

Ian.



-----Original Message-----
From: Ian B [mailto:Ian@xxxxxxx]
Sent: 22 February 2002 22:21
To: ukha_d@xxxxxxxSubject: RE: [ukha_d] IR Tx/Rx


Time to hide????

Have got the bits from Ian and the circuit is very simple. The diagram is a
little low res, is there a better one on the net anywhere?

Notes: if you want to power the LEDs any harder you will need a separate
power supply and a transistor. The PIC can only source 25ma max and I don't
know what the serial port can supply.

Do folks want this?

Ian

-----Original Message-----
From: Quinten Uijldert [mailto:yahoogroups@xxxxxxx]
Sent: 22 February 2002 22:03
To: ukha_d@xxxxxxxSubject: Re: [ukha_d] IR Tx/Rx


> I wouldn't even know where to start Quinten.
>
> Girder uses plug-in DLLs to talk to IR transceivers, and the
> IR protocol for the Lego Tower would require a custom DLL to do.
>
> I'm a hardware engineer (I don't even know C) and I just don't know where
to
> go.
>
> I can confirm that the tower doesn't work with any sort of generic UIR
> plugin.
>
> I looked at this extensivly before trying the UIRT. I mailed a pile of
stuff
> to the other Ian,
> hopefully he can do something with it.
>
> Ian.

Ok, in that case I will have no other option than to stalk Ian "Board" Bird
instead then ;-)

Q.

--
Very funny Scotty. Now beam down my clothes!



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