Re: Understanding IR

["Sean Stratton" <egroups@xxxxxxx>]

There are other ways of connecting IR to your PC, I have lifted the
text
below from a document in zasmp3 (which is very cool and worth a look)
http://www.bnro.de/~zeller/index.htm

Sorry if the Diagram is a little wonky true type fonts and ascii don't
always go hand in hand

Sean

Enc---

Comprising only three parts the circuit is as simple to build and as
cheap
as it can be. A 4.7 kOhms pull up resistor, a 5V voltage source (you
can
build it using a 7805 voltage regulator or take it from your computer) and
a
combined IR preamplifier and demodulator with inverted TTL output.
I recommend you to buy a TSOP1738, SFH506-38 or take one from a broken
hifi
component, video recorder, tv set or whatever else. Those are generally
located at the front panel behind an IR transparent plastic and are
often
screened by a small metal box around them. Although I have never seen
them
myself I heard of some preamps having non inverted output, those won't
work
with ISRemote! All of them have only three pins: +5V, TTL data out, GND
If you don't know the correct pin assignement try to get a datasheet for
it.
I've tested a whole bunch of these IR preamps and found most of them
working
well.

                    
______+___________
                   
     
           
                   
       Resistor   IR preamp
                   
       4k7       
________
           voltage
+o     
          
_+        (for TSOP 1738
           
source         +_____________<-
data   pin-out see below)
               
5V -o     
           
_-       
                   
     
            ________
                   
_________________+
                          
           
                          
Pin 10     Pin 25
                        
_______________
                        
\   LPT port    /
                         
\_____________/

---
----- Original Message -----
From: <ian.bird@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, October 17, 2002 4:41 PM
Subject: Re: [ukha_d] Understanding IR


>
> Hi John
>
> First off, the port on your laptop will be IRDA not IR. IRDA is a
short
> range, low power high speed thingy. Your remote control is relatively
high
> power long range and slowww. The two on the whole do not mix. For
remote
> controls there are several 'standard' ways of encoding your binary
data
> including RC5, RC6 Sony PWM, Japanese etc. etc. All these though
are
> basically on and off pulses of IR light which can be interpreted by
a
> receiver. I have some references at home but they are just
snippets
really.
>
> X10 - what do you mean by remote devices? X10 works by superimposing
a
> small signal onto the mains at the zero crossing point of the sine
wave.
> This means x10 stuff is connected by the mains and only over a
relatively
> short distance without repeaters. X10 RF stuff is radio technology
to
carry
> the data in a very similar way to IR. The device which plugs in then
turns
> this back into waves on the mains.
>
> If you have a PC application for example this will need an interface
into
> the mains to produce the x10 signal. An x10 light socket or whatever
can
> then pick it up.
>
> HTH
>
> Ian
>
>
>
>
>
>
>                      
John Poltorak
>                      
<jp@xxxxxxx>           
To:
ukha_d@xxxxxxx
>                                               
cc:
>                      
17/10/02 15:43          
Subject:  [ukha_d]
Understanding IR
>                      
Please respond to
>                      
ukha_d
>
>
>
>
>
>
>
> Does anyone know of any good references for understanding IR?
>
> In principle, is there any reason why I shouldn't be able to use the
IR
> port on my laptop as a remote control for the TV or any other device
which
> which be remote controlled?
>
>
> I'm also trying to figure out how X10 is supposed to be used to
connect
> to remote devices... Do I need some sort of converter to be able to
do
> this? As I understand it X10 only works across devices connected by
the
> mains.
>
>
> --
> John
>
>
>
>
>
> http://www.automatedhome.co.uk
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