I've just got a Arduino duemilanove and I'm trying to play with 4 multi coloured LEDs. For some reason pins 0 and 1, the rx and tx ones? don't like the LEDs they just flash and pin 13 is quite uncooperative with fading them. So I'm limited to three LEDs (9 pins, 2 - 12). So I'm guessing I need to get a multiplexer. My local store where I got the duemilnove from has these ones:
4051, 4052, 4053, 74HC157, 74LS138, 74LS139, 74LS151, 74LS153, 74LS155, 74LS157
i am wondering which one, if none, to buy since i was reading an article which says the 4051 can't deal with brightness? just on-off...