The USB to i2c chip emulates a serial port.  I think that google may  
even reveal PIC code for this.
Talking to a serial port simplifies life for OS X, Windows and Linux.
All sorts of development environments support serial ports.  Python,  
Ruby , shells , F-script , RealBasic ( free for Linux )
Gus


On Dec 26, 2009, at 5:40 PM, PICdude wrote:

I like this.  A single I2C to USB interface with a bunch of I2C to
A/D, D/A, digital I/O interfaces would be a relatively simple
solution.  If I am going to create my own PCB for this, I might as
well go with the chip option.  Now I'm re-thinking why not just use a
USB PIC and force myself to learn that.  I'll sleep on that.

The big open concern is the PC-side programming.  I'm not sure I want
to get a full compiled development environment and mess with USB port
programming etc.  What would be nice is if there's an API set that
lets me control the I2C devices from a generic scripting language
(perhaps sh, bash, etc under Linux or something similar under Win),
and gives me simple function calls such as read input port, set output
bit, etc).  I need to research that.

Cheers,
-Neil.


Quoting YES NOPE9 <yes@nope9.com>:

> Consider a USB to i2c adapter.  i2c modules of all types abound.
> I could loan you my adapter that I bought from
>                      http://www.i2cchip.com/    ($70)
> They also have chips and modules ranging from $4 up.
>
> Gus
>
>



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