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On Sat, Jun 23, 2007 at 09:06:29AM -0400, Rolf wrote:
> >> *** actually, I have 16 RGB LED's, but I have 8 shining up from the 
> >> stage, and 8 shining down on to a white-board for cool effects.... There 
> >> are 8 light "boxes" and the 2 RGB LEDs in each box are wired in series. 
> >> Because the G and B LED's have high forward voltages (4.5V which in 
> >> series is 9V, I am driving the LED's at 12V, but the PIC at 5V).
> >>     
> >
> > 12V 'eh? With no resistors, or are you relying on pwm to limit the
> > average current?
> >
> >   
> As for releasing the code, I am happy to give it over to you with a GPL 
> license. I just don't have the facilities to host it, etc. Perhaps I can 
> put up another page on piclist. It will take some time, and if you want 
> to get a heads-up I can e-mail it to you sooner.

No rush, I'm trying to avoid too much work on this whole thing until the
art show is done, but I'd be happy to figure out some sort of
"contributed code" page on my site, and a piclist project repository is
a good idea too.

> As for the 12V-with-no-resistor,... no. I have resistors on each LED. I 
> am using the RGB LED OVSTRGBBCR8. Each colour has an 80mA maximum 

Oh, with the PLCC6 case. How did you find soldering them?

I gotta admit I haven't considered non-thru hole leds in my price
reasearch yet, looks like the cheapest ones are smd.

> continuous rating. I did my math at 50mA. The G and B have 60Ohm, the R 
> has 140Ohm.... with 4.5V drop, to limit current to 50mA on the G and B 
> (and having 2 LED's in series), I have a 9V drop on the LED's, and the 
> 3V/60 gives 50mA. With the red, 2.5V forward, that leaves 7V to control 
> current, I am using 140Ohm.

Good choice on the 50ma, it'll run 'till you're daughter's an electrical
engineer and wants to upgrade it. :)

- -- 
http://petertodd.org
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