I'm pretty new to hardware stuff. I have a basic idea to build a hardware controller for some proprietary software. I would need to read about 60 analog faders/potentiometers and 30 buttons. Also I need to drive about 40 LEds. I have Arduino or Raspberry Pi at hand. Up to 60ms delay from mechanical movement to registered value would be ok. I found some digital potentiometer accessible via I2C but at a hefty price (14$ per piece - I'd need about 60 of them)
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Can you MUX them? – winny Jun 07 '17 at 10:32
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And what is the question? – Andrew Jun 07 '17 at 10:32
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1What exactly is your question? Switches put on shift registers to read serially, pots use ADCs, probably with analogue muxes in front of them. – Colin Jun 07 '17 at 10:32
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1fyi: Regarding last sentence about digital potentiometers. When you say "*digital potentiometer*" most people will get an image of an output device (digitally controller potentiometer). – Nick Alexeev Jun 07 '17 at 19:29
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Nick, thanks. Terminology is sometimes hard at the beginning. – m_c Jun 08 '17 at 07:41
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Look for multi-channel ADCs to read your pots, chips with 16 or 32 channels are not unheard of. Or use analog muxes as Colin suggested, here's a DIY friendly solution if you're planning to solder by hand.
For buttons and LEDs, you can use multiplexing or shift registers, as described e.g. here.
Dmitry Grigoryev
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2Thanks Dmitry! That is exactly the stuff, I was looking for. It's always hard to create a clear question without knowing the exact terminology, but that lead me in the right direction. – m_c Jun 08 '17 at 07:35
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