Peter Todd wrote:
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> On Wed, Jun 20, 2007 at 08:59:19PM -0400, Rolf wrote:
>   
[snip]
>> Anyway, if you are interested I am happy to share all my work including 
>> Eagle PCB drawings and C18 code (with mostly assembler interrupt 
>> routine...).
>>     
>
> That'd be great thanks. Share it under the GPL, then that way, if I or
> anyone else ends up using any of your code, you'll get credit in the
> copyright notices of anyone who uses it.
>
>   
[snip]
>> *** 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.

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 
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.

Rolf
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