[Lab] how to control several RGB LEDs with Arduino
olaf.baumann at pobox.com
Fri Aug 1 08:59:26 EDT 2014
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.
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