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Re: Idea for IR zoning with HV


  • To: ukha_d@xxxxxxx
  • Subject: Re: Idea for IR zoning with HV
  • From: "andy_powell_is" <ukha@xxxxxxx>
  • Date: Sun, 28 Apr 2002 12:15:22 -0000
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx


I really really wish I understood this... it seems like a simple
solution that will work... but I just don;t understand it :(

Anyone fancy building something like this for me ... pretty please?
with idiot proof docs.. :D

Andy

--- In ukha_d@y..., "Keith Doxey" <lists.diyha@b...> wrote:
> 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



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