[LAU] Open Source MIDI control surface

simone-www.io-lab.org cimo75 at gmail.com
Tue Dec 2 21:16:45 EST 2008

On Tue, Dec 2, 2008 at 9:54 PM, David Griffith <dgriffi at cs.csubak.edu> wrote:
> On Tue, 2 Dec 2008, Matthew Smith wrote:
>> Hi Tim
>> > interesting thread as i am working on a control-surface myself atm ... i
>> > would be curious, if someone has some experience with higher-precision
>> > adc? most io boards i know (arduino/makingthings) provide 10-bit adcs,
>> > while i'd be interested in getting a higher resolution ... does anyone
>> > have experience with interfacing a microcontroller (e.g. arduino) with an
>> > external high-resolution adc?
>> For regular 7-bit stuff, I'll be using a 16-input, 8-bit ADC.  However,
>> in order to get higher resolutions for the 2 x 7-bit messages, I am
>> dropping analogue input in favour of rotary encoders.
>> The encoders that I will be using (currently on their way from China)
>> output a 2-bit Gray code, meaning that I can read 4 of them
>> simultaneously using a single port.  (I'll actually be using 8 in a 4 x
>> 2 matrix, scanning them just like a keypad.)  $16 USD for 10 - quite a
>> lot cheaper than pots!
>> If your input has to be analogue, ADCs are available with many different
>> interfaces - synchronous serial (like the TI ones I'll be using), SPI,
>> I2C and byte-wide, which can be accessed like external memory.
> I'm surprised nobody has mentioned midibox.org yet.  They have everything
> you need to make your own control surface, and it's all GPLed.  There are
> links there about midifying pipe organs and assorted other things.  One
> guy turned a sofa into a midi controller.

I think you should read the entire post ;)
btw the sofa guy is known as Seppoman, i am the lucky owner of some of
his analog filter boards

> --
> David Griffith
> dgriffi at cs.csubak.edu
> A: Because it fouls the order in which people normally read text.
> Q: Why is top-posting such a bad thing?
> A: Top-posting.
> Q: What is the most annoying thing in e-mail?
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