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merlinb

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  1. merlinb
    Either use a 317 and put a couple of diodes in series with the output, or use an LT3080.
  2. merlinb
    Here's a simplified example showing how you could feed power to individual LED segments. It displays two codes using a 2-way switch, so six codes would need a 6-way switch. You can have as many digits as you want, of course. OK, you'll need a shedload of diodes, but diodes cost 1p each or something. (Some of the diodes in this example are redundant, but you get the idea) (To a man with an Aduino, every problem is a nail digital)
  3. merlinb
    Since you only need fixed codes, you can indeed do this using a cheap rotary switch, and lots of diodes to direct power to the right segments. What codes do you want, exactly? (you can get 6-way switches very easily, so maybe limit yourself to six codes).
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