RE: Idea for IR zoning with HV

["Keith Doxey" <lists.diyha@xxxxxxx>]

You dont actually need ANYTHING to Zone IR on Homevision.

 

The 3.5mm jack has the tip connected to SWITCHED +5v which is the modulated IR output.

The sleeve of the jack is permanently connected to ground.

 

PORT A is an open collector driver which GROUNDS the pins of port A.

 

If you wire like this you have IR

 

 

3.5mm Tip ----------------------------------------------------------------------------------------------

                                                                                                          

                     R                   R                     R                    R                   R

                                                                                                          

                     E                   E                    E                     E                   E

                                                                                                          

                     A1                A2                    A3                  A4                  A5 ETC

 

where R is a series resistor of about 100 ohms, E is the IR emitter, A(x) is the port A pin

 

Before you send an IR command you just set the required pin of port A to low (remember the logic is inverted for PortA) and away you go.

Keith

www.diyha.co.uk
www.kat5.tv

-----Original Message-----
From: Alancc [mailto:alan.cc@xxxxxxx]
Sent: 25 April 2002 18:43
To: ukha_d@xxxxxxxSubject: Re: [ukha_d] Idea for IR zoning with HV

Seems to me the idea is sound although you normally only have two leads on
the transmitters, its receivers that have three. You could switch one leg of
the signal through a small relay connected to the output ports.

Alancc
----- Original Message -----
From: graham_howe <graham@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, April 25, 2002 2:05 PM
Subject: [ukha_d] Idea for IR zoning with HV


> I *think* I have an idea for achieving zoned IR distribution from
> HomeVision without an expansion board, but I would like to hear
> others opinions as I have very little experience with HV beyond X10.
>
> The aim is to have HV send a specific IR signal to 1, some or
> all 'zones'. Specifically I want to control each of my 3 DDAR's
> independantly some of the time and synchronised sme of the time.
>
> As I understand it, an IR LED requires three wires (I am deliberately
> being simplistic in terms of the electronics because I don't know
> much about it!), SIGNAL, +tve, -tve. So if SIGNAL comes out of the
> single HV IR output and into a Krone block, it can be split to
> multiple wires. The power (+tve presumably) could be controlled
> (switched) from other HV outputs, one for each zone.
>
> Macros would then be used to run the following sequence:
>
> - supply power to 1 or more zones
> - send IR signal to all zones
> - stop power to all zones
>
> The signal will of course have no effect at the IR LEDs that have no
> power.
>
> This seems to give zoned IR without any additional hardware (other
> than the IR LEDs of course) and would certainly be much cheaper than
> expansion boards or dedicated distribution blocks.
>
> So what does everyone think, and even better, would someone like to
> have a go at prototyping this (I have zero time available at the
> moment).
>
> Regards
>
> Graham
>



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