TCL5940 Question

Hi people,

Just want to get someone to look at what im planning on doing (once i get hold of hardware) just to make sure im not about to melt anything. Think what im doing is ok, but im a bit new to this and just want to double check

Im planning to wire up 2 TCL5940's to an Arduino Pro Mini like in the diagram on the playground page (http://www.arduino.cc/playground/Learning/TLC5940). however, I need to drive 4 RGB LEDs per channel (eg 1 channel driving the 'R' on 4 LEDS, 1 driving the 'G' etc), so im going to be needing more current than i can get over USB. because this is going to end up mounted inside a computer case, the obvious thing is to use the 5v 'molex' (old IDE power connector) off the computer's supply.

-Can I connect the TCL's VPRG, GND, VCC and DCPRG pins to the molex, and still interface the chip from the arduino? -Im planning on getting the RGB LEDs from here: http://ledstuff.co.nz/product_info.php?cPath=47&products_id=33 (unless anyone can point out someone else who has them cheaper) Are those the right LEDs for this, or should i be getting common annode LEDs? -Im i correct in thinking that i will need a limiting resistor/voltage divider between the chip and the LED? -Is there anything obvious im missing?

Thanks

the obvious thing is to use the 5v 'molex' (old IDE power connector) off the computer's supply.

Very often it is over looked that ATX Power Supplies require a minimum load to be stable. The one I have sitting here on my desk requires about 20Watts across all of the supplies.

Yeah. Something to keep in mind when im testing with an old supply, but once complete it will be inside a functional computer. Hard drives alone should draw enough power to keep it stable :P