<div dir="ltr"><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">Hey Lab,</div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff"><br></div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">
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.</div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff"><br></div>
<div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">The UNO has six PWM output pins and each RGB LED needs three. As the saying goes, twos company, but I want a crowd!</div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">
<br></div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">With regular LEDs, I used cascading shift registers to allow me to control 24 of them. A great success in my temporarily blinded eyes.</div>
<div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff"><br></div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">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.</div>
<div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff"><br></div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">thanks,</div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff">
Olaf</div><div class="gmail_default" style="font-family:courier new,monospace;color:#3333ff"><br></div></div>