RE: Re: ir transmitter some success

["Ian B" <Ian@xxxxxxx>]

You're right Frank. I was going on memory from when I did my relay
board
mark 1 and got it wrong. Checked the help files after pressing send
Dohh!

Ian B

>-----Original Message-----
>From: Frank Mc Alinden [mailto:armagh@xxxxxxx]
>Sent: 02 June 2002 13:52
>To: ukha_d@xxxxxxx
>Subject: Re: [ukha_d] Re: ir transmitter some success
>
>
>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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>
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