RE: Color Kinetics Controller

["Rob Mouser" <rmouser@xxxxxxx>]

Congratulations to Ian and Frank for having a thread which may as well
be written in another language to me!

Yours feeling very dim!

Rob

Ps. Did you get this line out of Startrek:

PNP drive
transistor driven by NPN pulling the PNP base low

:-)



      -----Original Message-----
      From: Ian Davidson [mailto:ian@xxxxxxx=
.uk] 
      Sent: 13 October 2002 16:28
      To: ukha_d@xxxxxxx
      Subject: Re: [ukha_d] Color Kinetics
Control=
ler
      
      
      Hi Frank
      
      The opto is an option. I had looked but
thou=
ght against it for
now. The
      lights each have a 33k resistor in series
wi=
th the i/p and a 10K
resistor
      pulldown to 0V from the i/p. So each time a
=
light is added to
the chain it
      adds another 43k resistance to 0V. I think
I=
'm going to use a
PNP drive
      transistor driven by NPN pulling the PNP
bas=
e low. The NPN can
then be
      driven straight from the uP. It should work
=
out at about =A31.50
for the
      transistor bits. The board is a stand alone
=
powered of the same
PSU as the
      lights so isolation at this time is not
need=
ed. I think to be on
the safe
      side when I add the rs232 control an Opto
to=
the serial side of
things is a
      must, just to prevent any damage to PC MB
if=
wired incorrectly.
I have found
      some transistors with the correct spec but
i=
f you have used any
suggestions
      of devices with turn-on & off times in
t=
he 10's of nS then
please let me
      have the numbers.
      
      Thanks Frank
      
      Ian D
      
      
      ----- Original Message -----
      From: "Frank Mc Alinden"
<armag=
h@xxxxxxx>
      To: <ukha_d@xxxxxxx>
      Sent: Sunday, October 13, 2002 10:12 AM
      Subject: Re: [ukha_d] Color Kinetics
Control=
ler
      
      
      > Hi Ian
     
>      &nbs=
p;      Just a thought could you not use a high
sp=
eed opto
to do the
      > switching then you could use +5v
contro=
l ??? Depends how many
you need as
      > they cost around $8.00 each..
      >
      > Frank Mc
      > ----- Original Message -----
      > From: "Ian Davidson"
<ian@=
galeforce9.co.uk>
      > To: "HA Yahoo group UK"
<u=
kha_d@xxxxxxx>
      > Sent: Sunday, October 13, 2002 6:58
PM<=
BR>
      > Subject: [ukha_d] Color Kinetics
Contro=
ller
      >
      >
      > > Hi All
      > >
      > > OK. The controller has not moved
f=
ar yet. I have a very
basic working
      unit
      > but to test it I modified one of the
li=
ghts to accept 0 to 5V
switching.
      The
      > last thing anyone wants is to take all
=
there lights apart and
swap some
      > surface mount components. So I'm
curren=
tly sorting out the
electronics to
      > control unmodified units. They need
hig=
h speed switching
transistors. The
      > data pulses are 4 micro seconds in
leng=
th and need to switch
to +24V.
      > Standard general purpose transistors
ha=
ve switch on/off times
of a few
      > microseconds and do not work. If I
don'=
t have any suitable
transistors
      I'll
      > order some tomorrow and try them out
Tu=
esday night. I should
get a couple
      of
      > hours tonight so I'll try to do some
mo=
re work on the
software. I just
      > thought I would keep people informed
as=
I've been to busy over
these last
      > few days to post.
      > >
      > > Ian D
      > >
      > >
      > > [Non-text portions of this
message=
have been removed]
      > >
      > >
      > >
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