[Lab] how to control several RGB LEDs with Arduino

Darcy Whyte darcy at inventorArtist.com
Fri Aug 1 09:05:52 EDT 2014

There are some chip thingys for controlling lots of LEDs.

I have some somewhere... I think the ones I have are good for up to 24 LEDs

I'll be in my lab in a few minutes so will get the part numbers...

Darcy Whyte

Art+ inventorArtist.com <http://inventorartist.com/> | Aviation
Contact: darcy at inventorArtist.com | 613-563-3634 by appointment (no text)

On Fri, Aug 1, 2014 at 8:59 AM, Olaf Baumann <olaf.baumann at pobox.com> wrote:

> Hey Lab,
> I got some RGB LEDS to play with but when I count the number of pins I
> need, it doesn't look like I can drive very many.
> The UNO has six PWM output pins and each RGB LED needs three.  As the
> saying goes, twos company, but I want a crowd!
> With regular LEDs, I used cascading shift registers to allow me to control
> 24 of them.  A great success in my temporarily blinded eyes.
> Is there an analog analogue to the digital shift register?  It seems that
> PWM is a hack for a voltage level, would a steady voltage be better?  SPI
> or I2C would be bonus--maybe I could use an ATtiny85.
> thanks,
> Olaf
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