RE: IRDA Extenders

["Keith Doxey" <ukha@xxxxxxx>]

Disassembly.....Yes please :-)

Re: Learning. The reasons it wont learn IRDA are that the receiver they use
may not be capable but more likely the frequencey is too high. To correclty
learn a signal you have to sample the received signal at a rate several
times higher than the actual datarate of the signal. At the datarate is
really high, the microcontroller probably doesnt run fast enough to
oversample.

Keith



-----Original Message-----
From: Stuart Whyte [mailto:lists@xxxxxxx]
Sent: 07 January 2002 23:11
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] IRDA Extenders


I have said URC-7560, which works fine with my Telewest box.  It is very
picky tho about being pointed DIRECT at the box, but works for about 10'
(Furthest I can get away from the box)The transmitter ont the front is just
an IR LED, the same one that is used for IR.  The remote is a learning
remote, however it WILL NOT learn IRDA commands (This is stated on the
website)

I will see if I can take apart my telewest box and see if I can find the
receiver, if anyone thinks this will help

S.

-----Original Message-----
From: Des Gibbons [mailto:des@xxxxxxx]
Sent: 07 January 2002 22:46
To: ukha_d@xxxxxxx
Subject: RE: [ukha_d] IRDA Extenders



How much is a OFA6, worth butchering to see what transmitter they use,
assuming it transmits IRDA over long range?

Des
> -----Original Message-----
> From: Graham Kiff [mailto:graham.kiff@xxxxxxx]
> Sent: Monday, January 07, 2002 22:22
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] IRDA Extenders
>
>
> As far as I know Keith, there are NO Pronto Codes for IRDA boxes as
the
> Pronto is not capable of transmitting IRDA.  There is however a
> code for the
> OFA6 (URC-7560) which I can confirm works with the NTL  box.
>
> Cheers
> Graham
> (Hopeful that one day someone with crack the IRDA problem ;-))
>
> -----Original Message-----
> From: Keith Doxey [mailto:ukha@xxxxxxx]
> Sent: 07 January 2002 22:14
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] IRDA Extenders
>
>
> Are there Pronto Codes for IRDA Set top boxes ?
> Didnt someone on the HV list have a way of converting Pronto to HV.
>
> Even if it cant learn it, it may be able to transmit it when told
exactly
> what to so.
>
> Keith
>
> -----Original Message-----
> From: Ian B [mailto:Ian@xxxxxxx]
> Sent: 07 January 2002 22:00
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] IRDA Extenders
>
>
> Haven't checked but I cannot see HV being IRDA literate.
>
> I still haven't given up completely but am not doing anything about it
> either.
>
> Maybe when I have some more time and the current projects are
completed.
>
> Ian
>
> -----Original Message-----
> From: Keith Doxey [mailto:ukha@xxxxxxx]
> Sent: 07 January 2002 21:03
> To: ukha_d@xxxxxxx
> Subject: RE: [ukha_d] IRDA Extenders
>
>
> Not much progress with the IRDA.
>
> I dont believe it will be possible to build a reliable combined
repeater.
>
> The IRDA receiver responds to normal IR remotes as well, but outputs
the
> modulated signal not the demodulated signal like the TSOP1838 does.
>
> The reception range of the TSOP is superb. Any angle and in my
> house I cant
> get far enough away for it not to pick up. The IRDA receiver is
extremely
> short range and at only 6 feet will just about receive if the remote
is
> pointed DIRECTLY at it.
>
> The problem is with RECEIVING the IRDA signal as it was really
> only designed
> for short range and I havent been able to find out what receiver
> is used in
> the IRDA settop boxes.
>
> At the end of the day, I cnt guarantee that my IR repeater will
function
> perfectly with all equipment and I dont know of any that are (sure
someone
> will correct me if I am wrong). What I am aiming for is a repeater
that is
> 99.99999999% reliable and will work with 99% of equipment.
>
> One possible workround it this...
> Pick an unused "Standard Code" from Homevision, (there are
loads
> that arent
> used on UK kit so it shouldnt clash but will be found on most
universal
> remotes. Create actions within Homevision to send learned IRDA codes
on
> receipt of the standard code chosen.
>
> <PSUEDO CODE>
> 	If <SomeYankIRCode_Button1> received then
> 		Transmit IRCode <IRDA_Button1>
> 	End If
>
> <PSUEDO CODE>
>
> (I dont know if HomeVision can successfully learn IRDA as I havent got
the
> means to test the transmissions but I am sure others have.)
>
> The KAT5 IR repeater can then relay the IR code from the handset to
> HomeVision (the switcher will have inputs/outputs for IR signals
> to be sent
> from/to HV). Homevision interprets the received command and sends the
> required code(s) to the IRDA kit.
>
> I dont know if that will definately work but it should be possible IF
> Homevision will learn IRDA.
>
> Keith
>
> -----Original Message-----
> From: Stuart Whyte [mailto:lists@xxxxxxx]
> Sent: 07 January 2002 16:41
> To: UKHA
> Subject: [ukha_d] IRDA Extenders
>
>
> Ian/Keith,
>
> How are the IRDA Extender projects going?? Any further developments??
>
> Cheers
>
> Stuart
>
>
>
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