RE: Re: IR Distribution

["Ian B" <Ian@xxxxxxx>]

Hi Nick

In reverse order - TSOP. I have no idea but it is the IR receiver bit that
plugs into the board via a 3.5 mm stereo jack. It takes the IR signal and
demodulates it producing a readable output equating to 1's and 0's or
whatever. My units don't care what it sends as they either propagate the
signal to another unit or re-transmit it locally via an IR emitter or both.
TSOP's come in different flavours, the two I am interested in are 38KHz and
56KHz which make up most of the IR devices found in the home.

These units use a PIC micro controller to add some smarts to the task of
sending and receiving IR throughout the house.

There are two TSOP inputs provided, one for 38KHz and the other for 56KHz.
You can connect more than one TSOP to either input but they must be of the
same KHz range. This is nothing to do with the TSOPs but the PIC treats
input on a port as either 38KHz or 56KHz. If you mix these you could change
the IR signal from 38KHz to 56KHz or vice versa. Might be what you want to
do????

There are two outputs which can send either 38KHz or 56KHz. These are
configurable as either both 38KHz or one of each. Most people would have
them as both 38KHz due to the scarcity of 56KHz kit.

Configuration options include setting whether the unit provides feedback
protection or not. This means that if a unit is sending IR it will not
receive it from the onboard TSOP unit at the same time. This avoids
feedback
loops etc. This feature can be disabled so the unit can be used to 'relay'
a
signal into a cabinet for example. Care would have to be taken to ensure
the
unit does not receive the signal it is sending otherwise a feedback loop
may
happen.

I am looking at some tweaks to improve reliability but have little news on
that yet. Essentially I will be trying to make sure an IR signal is real
and
not stray light. This feature will be switchable on/off as I cannot guess
everyone's application.

Finally these units communicate with each other using an RS485 bus. This is
multidrop (many units) in a daisychain fashion. I have tested two at over
80
meters with alarm cable with no problems.

There is more so if you have any specific questions please drop me or the
list another line.

Ian

> -----Original Message-----
> From: nickt@xxxxxxx [mailto:nickt@xxxxxxx]
> Sent: 15 October 2001 10:18
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: IR Distribution
>
>
> Hello Ian,
>
> I'd be keen to learn more about how your products can be used &
their
> functionality - please can you give me / point me to appropriate
> info? Also (excuse ignorance) what does TSOP stand for?
> Thanks
> Nick
>
>
> --- In ukha_d@y..., "Ian B" <Ian@M...> wrote:
> > Hi Nick
> >
> > In the recent past I have produced a circuit board which goes
with
> a circuit
> > designed by Nigel Orr. I have been working recently on a PIC
based
> system
> > which is nearing completion. I have working prototypes and have
> tested both
> > transmission range between units and TSOP to unit range at over
80
> meters.
> > They also have built in feedback protection with an override
> depending on
> > the type of use intended. If you have more specific questions
just
> ask.
> >
> > Ian
> >
> > > -----Original Message-----
> > > From: nickt@t... [mailto:nickt@xxxxxxx...]
> > > Sent: 12 October 2001 13:59
> > > To: ukha_d@y...
> > > Subject: [ukha_d] IR Distribution
> > >
> > >
> > > Hello,
> > > I'm new to this group. Main HA interests are audio (+ a bit
of AV)
> > > distribution over Cat5. Have been trying out Keith Doxey's
KAT5
> > > modules with pleasing results (and will probably need some
audio
> > > specific ones, cost permitting...) but I'm unsure about
direction
> to
> > > go wrt IR distribution.  At this stage all I really want to
do is
> to
> > > be able to take my hifi remote into one of 3 or 4 different
rooms
> &
> > > control it from there. I'd prefer to use CAT5 rather than
radio.
> > > I'm sure its not rocket science, what solutions are out
there? I'm
> > > happy to put together simple circuitry myself if thats what
it
> takes.
> > > Any advice, pointers appreciated.
> > >
> > > Nick
> > >
> > >
> > >
> > > For more information: http://www.automatedhome.co.uk
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> > > List owner:  ukha_d-owner@y...
> > >
> > > Your use of Yahoo! Groups is subject to
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> > >
> > >
> > >
> > >
>
>
>
> For more information: http://www.automatedhome.co.uk
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>
>
>


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