RE: Re: Idea for IR zoning with HV

["Ian B" <Ian@xxxxxxx>]

I'll help you through this one Andy if you like. I am away from mail for
the
first three days of the week but back late on Wednesday. We can pick it
up
>from
Ian B

> -----Original Message-----
> From: andy_powell_is [mailto:ukha@xxxxxxx]
> Sent: 28 April 2002 13:15
> To: ukha_d@xxxxxxx
> Subject: [ukha_d] Re: Idea for IR zoning with HV
>
>
>
> 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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