Hi all!
I recently decided to build an LED cube. I went with 4x4x4, but since I didn't have 64 LEDs of one color, I went ahead and decided to make it four different colors, like so:
R R R R
G G G G
B B B B
W W W W
My question is which resistors should I use? They're each 5mm. Thanks!
-Aaron
What is the Vf of the different LEDs? You will need a resistor that supports the lowest Vf - probably Red.
CrossRoads:
What is the Vf of the different LEDs? You will need a resistor that supports the lowest Vf - probably Red.
I think Red is 2.0. Actually, I was thinking, since the different layers each have their own cathode, could I just put a resistor on each layer for its respective color? So like:
R R R R ---^v^150?v^v---
G G G G ---^v^100?v^v---
B B B B---^v^100?v^v---
W W W W---^v^100?v^v---
(Sorry, though the ^v^v^ would look kinda like a resistor :P)
One resistor per layer only works if you are turning on one LED at a time.
What about in the case of charlieplexing or multiplexing?
That would be turning on one LED at a time then wouldn't it.
That would also give an agonyzingly slow refresh rate prone to looking flickery.
Much better to drive a whole layer at one time.