Re: Re: ir transmitter some success

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

Hi Andy
            
The other guys must be busy,so i,ll have a go, Are you using
one of the circuits  Ian B has on his site . If  so which one
Frank mc
----- Original Message -----
From: "andy_powell_is" <ukha@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, June 02, 2002 9:18 PM
Subject: [ukha_d] Re: ir transmitter some success


>
> Frank Ian, Ian,
>
> I've actually found a problem :(
>
> When +5v is applied to the base of the first transistor, even if
the
> collector is not connected, the 2nd transistor is supplying
current
> to the LEDs... I don't understand that. didn't think it should
> happen :(
>
> any ideas
>
> Andy
>
>
> --- In ukha_d@y..., "Frank Mc Alinden" <armagh@b...>
wrote:
> > Hi Andy
>
>            
Isnt it  brill when things go right .Your doing great.
> Good idea
> > about the Basic Stamp. I spent all day yesterday frustrated .
You
> wouldnt
> > learn much if everything went right ,its when it goes wrong
thats
> when you
> > learn. Did you post your photos on Marks Website ? if so how?
> > Good Luck
> >
> > Frank Mc
> > ----- Original Message -----
> > From: "andy_powell_is" <ukha@b...>
> > To: <ukha_d@y...>
> > Sent: Sunday, June 02, 2002 7:18 PM
> > Subject: [ukha_d] Re: ir transmitter some success
> >
> >
> > > Good stuff Frank... at the moment I am just using this to
learn,
> in
> > > the end I'll probably end up using one of the designs from
you
> > > experts...
> > >
> > > I've had a little brainwave here too... before connecting
to
> > > Homevision I'm actually going to sacrifice a basic stamp..
(well
> > > sacfrifice is'tn the right word as it SHOULD be ok
afterwards)..
> > >
> > > The Basic stamp can cope with 30ma max per pin and 60ma per
8
> pins..
> > > which means if i create a fake homevision using the basic
stamp I
> can
> > > certainly check on the current draw before the final
connection..
> > >
> > > Obviously this is the final test before connecting to
homevision..
> > > before all that I need to take some measurements.... but I
have
> > > transferred the first bit from  breadboard to
stripboard... :D :D
> > >
> > > and it works!! :D .. I'm just using this one really as
> layout...and
> > > testing, I need to compress  it really...
> > >
> > > I also think I have got it down to about 512ma total of 8 X
9
> leds, i
> > > think by chance I managed to get some sensitive ir emitter
leds I
> > > need to double check but I think I can get away with
600ohm
> (possibly
> > > more as the emitters will be right beside the internal
IR
> receiver of
> > > any kit) resistors for them and the visible leds have
3.9k
> resistors
> > > and are still fairly bright... (again all by chance)
> > >
> > > Part numbers for farnell are:
> > >
> > > 178301 Ir Emitter
> > >
> > > (farnell datasheet http://www.farnell.com/datasheets/5344.pdf
)
> > >
> > > 3013900 yellow led
> > >
> > > (no datasheet at farnell but it is at www.marl.co.uk 
marl part no
> > > 352-582-20 )
> > >
> > > Andy
> > >
> > >
> > > --- In ukha_d@y..., "Frank Mc Alinden"
<armagh@b...> wrote:
> > > > Hi Andy , Ian + Ian
> > >
>                            
Had some success today with the 8
> zone
> > > ir controller . I decided to bypass the opto connected
to
> incoming ir
> > > signal from Hv to confirm my suspicions. Tried it again and
it
> worked
> > > but only with two ir leds inserted in the Zone Splitter .
Looked
> at
> > > my schematic and realised it was slightly different to my
homebrew
> > > circuit. In my homebrew unit the driver transistors were
connected
> > > common emitter but my new circuit was common collector .Re
did the
> > > driver transistors and tried again. Now works with all 8 ir
leds
> in
> > > Zone Splitter on all Zones . The range is approx 15ft and
i
> monitored
> > > the current which was approx  5mA . I set up my Hv
ports thru the
> > > control menu rather than a macro at this stage just to
confirm my
> > > hardware was connected ok. Would still like to use opto
isolation
> on
> > > the incoming ir ,will order something from rs components.
Now must
> > > update my drawing before i forget.
> > > >
> > > > Frank Mc
> > >
> > >
> > >
> > > For more information: http://www.automatedhome.co.uk
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> > >
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> > >
>
>
>
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