RE: Re: ir transmitter some success

["Ian B" <Ian@xxxxxxx>]

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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