Re: Re: ir transmitter some success

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

Andy
        Whats happening is that with +5v
on the first transistor thru
resistor? there is enough current  going into the next transsitor to
drive
it on. Also i believe HV sends a +5v switching signal. Port A outputs
do
switch to ground (open collector).

Frank
----- Original Message -----
From: "andy_powell_is" <ukha@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, June 02, 2002 9:57 PM
Subject: [ukha_d] Re: ir transmitter some success


>
> Frank,
>
> No, those seems to be very different from the original...
>
> If you look at http://www.automated.it/homevision/HVIR2.jpg
>
>
> that's what I'm doing, tho the Hovevision port ground isn't in the
> circuit... I've just tested on my circuit and if I put a ground
> connectoin in where it is on the diagram it fixes the probelm...
so
> the question is does Port A go to ground? is this safe to do?
>
> Andy
>
>
>
> --- In ukha_d@y..., "Frank Mc Alinden" <armagh@b...>
wrote:
> > 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@b...>
> > To: <ukha_d@y...>
> > 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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