Vary LED Brightness

[bea788]

Is there anyway to individually adjust the brightness of an LED at a certain time in the cycle and all? I know given everything in the kit it is not possible but what if a DAC(Digital to Analog Controller) or a PWM(Pulse Width Modulator) was added or something?

What I am trying to get at is instead of using 30 LEDs, use 10 RGB LEDs on the SpokePOV, which would then give 8 color options unless there was some way to vary the how much current/voltage is going to each individual part of the RGB LEDs, and then possibly you could get the full 256 colors of an RGB LED.

[sparr]

SpokePOV could feasibly do PWM. The uC is plenty fast enough, but it would require some re-engineering of the i/o, and storing less banks or lower resolution images. This is on my to-do list, along with a bunch of other changes I am making.

[kayrock66]

You could probably do the PWM thing but you'd need to work with images stored entirely in the memory of the uC. I think it would be to slow to read the EEPROM and do PWM. I've done some experiments with this and to date haven't been that jazzed with the results.