Re: Re: ir transmitter some success

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

Sorry Ian
               
Port A  does switch to ground . The chip is a uln2803.
Checked the manual  to be sure . Also im using the mux pins as being
driven
by open collector .
Frank Mc

----- Original Message -----
From: "Ian B" <Ian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Sunday, June 02, 2002 10:35 PM
Subject: RE: [ukha_d] Re: ir transmitter some success


> Andy
>
> I think the logic behind this circuit is flawed which is probably a
case
of
> too much advice from different sources, myself included. Using the
> components you have already you could make the 'More' circuit on
breadboard
> as per www.mollyology.com then HV IR. I would recommend you do
this.
>
> Problems with the one mentioned below are
> a) I don't think PORTA sinks to ground. It is a relay port which means
it
> simply switches between contacts. You could then connect one of those
to
> ground to achieve what you want but this is not very elegant.
> b) The ground in this case (not the HV port one) would be the IR
ground
> which would turn on and off the LEDs. It would be better and safer if
the
> ground was direct to ground controlled by a transistor which in turn
would
> be controlled by the IR port.
>
> In all honesty the circuit on my web page is very similar but works
around
> the problems above.
>
> Sorry.............
>
> Ian B
>
> >-----Original Message-----
> >From: andy_powell_is [mailto:ukha@xxxxxxx]
> >Sent: 02 June 2002 12:57
> >To: ukha_d@xxxxxxx
> >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
>
>
>
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