Doh! i got the values backwards, I meant 150 ohm for the red, 100 for the blue and green.
I couldnt even buy shift registers locally, the only stores that have parts are radioshack, and oregonelectronics, radioshack has almost nothing helpful, and OE only carries NTE parts, and they are expensive, and not very helpful.
I can get resistors at both places, OE is $.25 each, and RS is #1.20/5 pack. We used to have a Norvacs, but they went out of business, probably because there just isnt enough support for them, and they were a bit expensive (about the same prices as OE and RS, but they did have a lot of parts, most of the time I could actually get what i needed, but sometimes you gotta spend $10 for a cap.)
I can order stuff online, but it usually means waiting a week or 3. I also dont like spending $1 on resistors, and have to pay $5 shipping to get it within a week. I'd rather spend $5 on a driver chip that does everything i need, and looks good on display.
Even if I had all the resistors I need for this project, its gunna be ugly trying to figure out where to put them, and I like to use uninsulated wire, which will things difficult to wire, without shorting somewhere.
Im testing the 3.3v on my old cube. The shift registers are on the cathode side on that cube, they get 5v from 4 arduino pins (but are they have 220 ohm resistors) On that cube, when its lighting up all the LEDs on 1 plane, they are dimmer. 16 resistors on the column pins would be better than 4 resistors on the plane pins. If I did the RBG cube the same way, it would be 48 LEDs, and really really dim when all the LEDs on a plane are lit.
I dont have an accurate data sheet, so I had to hook up resistors, and measure and calculate (back on the first page of this thread are all those numbers... Scroll back to the first page, and check my numbers and math there, I think its right, but I could have made a mistake.
The voltage dividers I made are tiny (0402 parts), its very likely I buggered them up with my iron, or solder. No change in the software. Im using the old cube, and its shift registers (that work fine on 5v), to see if I can make them work at 3.3v like I hope to use on the new cube.