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RE: IR Tx/Rx
- To: <ukha_d@xxxxxxx>
- Subject: RE: IR Tx/Rx
- From: "Keith Doxey" <lists.diyha@xxxxxxx>
- Date: Fri, 22 Feb 2002 23:18:24 -0000
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
ukha_d-owner@xxxxxxx
- Reply-to: ukha_d@xxxxxxx
No
problem :-)
You
expect Craplins to....
a.
Have fuses
b.
Have the rating you want
....Good Luck :-)
Rapid
Electronics sell some "Self Resetting Electronic Fuses" in various ratings.
If you
exceed the design current they overheat and go high resistance.
Because they become high resistance it causes them to self heat
maintaining the high resistance.Because they
are
now high resistance very little current flows into the protected load (only
a
few mA) thereby removing any risk of damage/fire.
When
you remove the short circuit or overload and unplug the faulty circuit for
a few
minutes, no current flows so the device cools down and becomes low
resistance.
Reconnect your load and normal operation is resumed without having to
replace
anything.
Keith
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!
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
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!
For more information: http://www.automatedhome.co.uk
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