RE: Re: ir transmitter some success

["Ian B" <Ian@xxxxxxx>]

Right then. Another circuit posted. Basically it is Circuit A with a
twist.
Will work with the components you have already Andy. I will try and think
of
a better one soon but am up to my ears at the moment.

Ian

>-----Original Message-----
>From: Ian B [mailto:Ian@xxxxxxx]
>Sent: 02 June 2002 15:35
>To: ukha_d@xxxxxxx
>Subject: RE: [ukha_d] Re: ir transmitter some success
>
>
>Not exactly bad. I think the later designs running off PortC are better
as
>it does not involve negative logic i.e. '0' is off and 1 is on. At
this
>stage when most of this stuff is on breadboard I would go to PortC.
The
>relay ports are of more use for other things to some as well given
their
>better spec for current switching. For this circuit we are using
milliamps
>so it is of no concern.
>
>I have just looked at the manual (for the first time and as I had to
unbury
>it) and it looks as though HV switches the +ve 5v. Can someone
>confirm this.
>If so the circuit(s) will need revising as they are designed to switch
the
>ground. It is not a big issue but we must look at it now not later. I
will
>post alternative circuits on my site ASAP.
>
>Ian
>
>>-----Original Message-----
>>From: andy_powell_is [mailto:ukha@xxxxxxx]
>>Sent: 02 June 2002 14:46
>>To: ukha_d@xxxxxxx
>>Subject: [ukha_d] Re: ir transmitter some success
>>
>>
>>
>>Does sthat still mean the first design is 'bad' Ian? or does
that
>>make it 'fixed'
>>
>>Andy
>>
>>
>>--- In ukha_d@y..., "Ian B" <Ian@M...> wrote:
>>> 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@b...]
>>> >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@M...>
>>> >To: <ukha_d@y...>
>>> >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@b...]
>>> >> >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
>>> >>
>>> >>
>>> >>
>>> >> For more information: http://www.automatedhome.co.uk
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>>> >
>>> >
>>> >
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>>> >
>>
>>
>>
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