[LAU] Open Source MIDI control surface

[nescivi]

Hiho,

On Thursday 27 November 2008 18:35:52 simone-www.io-lab.org wrote:
> hi
> arduino is a bit slow but if you need only a few pots to tweak
> parameters building up a song it may be ok.
> I wouldn t advise it if you need something for live acts with sensors,
> or you are going to multiplex the analog inputs.

I didn't really encounter much problems streaming data from it.
You can slim down the serial protocol the Arduino sends out quite a bit and 
speed up the baudrate too.
It can be pretty fast that way.

> For a quick, darn cheap and easy (and high resolution: 10bit) little
> device i ve built a couple of these:
> http://1010.co.uk/avrhid.html
> these ones send HID protocol to USB, very fast and 10bit resolution, 8
> analog ins and 6 digital ins.

HID adds to the protocol transmitted.
Resolution is the same as the Arduino can be (10bit). Same amount of I/O 
ports.

The Create USB Interface can be built for about 15 euro in parts (without a 
custom made PCB), also does USB HID, and gives you 13 analog in at 10 bit, 
and a whole lot more digitial I/O. It's based on the PIC, and you can choose 
to program in C or ASM. I'm not sure the open source PIC tools are yet up to 
the chip used though. That might be a drawback.


If you want an overview of what's out on the market... take a look at 
http://www.sensorwiki.org
especially http://www.sensorwiki.org/index.php/Sensor_interfaces


sincerely,
Marije