[PD] Human interface Devices for PD

[Martin Peach]

thewade wrote:
>
>
> Maybe you can answer a couple of general questions for me?
>
> Is MIDI capable of doing continuous stuff?
>
MIDI sends triples or pairs of bytes over a serial interface so 
continuous values are quantized at the MIDI data rate.

> What is it's maximum sampling/transmission rate for MIDI?
>
At 1/31250 second per bit, there are ten bits per serial byte, so a pair 
of controller number and value will take 20/31250 seconds to be 
transmitted. That's 64 microseconds per message best case, or 1562.5 
updates per second. For full resolution you need 4 bytes, so it runs 
half as fast, and if more than one controller is active, slower still.

>
> Thanks for the schematic! I think what intimidated me most is the 
> interfacing of the software to the hardware: my C/C++ code is a bit 
> rusty...
> That schematic is pretty cool though! So many possabilities!
The program I have for it just sends MIDI continuous controller messages 
as fast as it can send them whenever an input changes. In PD it uses 
[ctlin]. One version I built has a two-axis accelerometer. The MIDI data 
is used to move an object in a GEM window.

Martin