Re: Re: Hmevision ir transmitter

["Frank Mc Alinden" <armagh@xxxxxxx>]

Andy

Port Pins  L = low H = high
1  2  3
L L  L

=  Zone 1 selected

1  2  3
H L L

=  Zone 2 selected

1  2  3
L H  L

= Zone 3 selected

1  2  3
H H L

=  Zone 4 selected  etc

You would either write a macro for each Zone setup to set or clear the
port
pins .Or use a variable
and load the variable with the tx number and then call a macro that
decodes
the variable and sets the port pins as required . The chip i use is a
4051
which i have used in other projects. Its normally used as an 8 to 1
input
multiplexer. You would call your macro first to setup your port pins to
select the Zone then a short delay and then transmit  the ir
signal.

Frank Mc
Frank Mc

----- Original Message -----
From: "andy_powell_is" <ukha@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, May 31, 2002 8:03 PM
Subject: [ukha_d] Re: Hmevision ir transmitter


>
> Frank,
>
> I'm still interested in this too... are you using some kind of
binary
> encoding using the 3 connections to represent the zones or have I
got
> it all wrong? I was thinking along the lines of:
>
> x=low o =high
>
> Example 1
>
> Pins
> 123
> x00 = zone 1
>
> Example 2
>
> Pins
> 123
> xox = zone 4
>
>
> Andy
>
>
> --- In ukha_d@y..., "Frank Mc Alinden" <armagh@b...>
wrote:
> > Hi Andy and Ian
>
>                         
Over the weekend i will make a prototpye
> of the
> > circuit i have and test  it. As  Ian B suggested, in my
circuit
> only one tx
> > is active at any time. If you require that several Zones are
active
> at
> > exactly the same time then go down the path Ian suggests. Also
the
> circuit
> > you are working on make sure the LEDS are the correct way
round.
> >
> > Frank Mc
>
>
>
>
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