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RE: IR Tx/Rx
- To: <ukha_d@xxxxxxx>
- Subject: RE: IR Tx/Rx
- From: "Ian Lowe" <ian@xxxxxxx>
- Date: Sat, 23 Feb 2002 08:07:52 -0000
- Delivered-to: mailing list ukha_d@xxxxxxx
- Mailing-list: list ukha_d@xxxxxxx; contact
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- Reply-to: ukha_d@xxxxxxx
Nope, I have a seperate PIC programmer.
Not to
mention, a stack of (otherwise not used) 4Mhz PIC 16F84A's
Which
I suppose I could flash with the right firmware to go along with a PCB.....
:D
Ian.
Woops, forgot about in circuit programming. Is this how you did
yours
Ian?
Ian
Thanks for that Keith. Do you have a page or part
number?
There is probably no need to use the 12 volt supply as the LED
usually drops about 1.2 v leaving plenty in hand. Run with a very small
resistor or none at all and fingers crossed you should have good range.
Choice of LED will influence range and angle the most though.
Ian
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!
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