On Tue, Dec 2, 2008 at 9:54 PM, David Griffith <dgriffi@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx > > 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? > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user > -- .wmv , .wma , .pps along with all proprietary Windows formats won t be accepted and/or viewed.... _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
