You won't get happy with SoftPWM on 15 channels (or more). I'd use some WS2801 chips (or something similar) to drive your LEDs. The PWM generator and the constant current driver is in the LED then and it's easy to chain them together.
You won't get happy with SoftPWM on 15 channels (or more). I'd use some WS2801 chips (or something similar) to drive your LEDs. The PWM generator and the constant current driver is in the LED then and it's easy to chain them together.