RE: Re: ir transmitter some success

["Ian B" <Ian@xxxxxxx>]

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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