I also used the PCF8591 which provides 4 additional 8 bit A/D converters. I put four of those along with two of the MCP23008 chips on a PCB as an input/output expander. It provides an additional 16 analog inputs and 16 digital inputs or outputs. There are actually another four analog outputs but I've not done anything with those. I modified my CVS SuperSequencer program for the PSIM using this expander board for a 16 control / channel sequencer. Documentation is on my site at
http://modularsynthesis.com/i2c-exp/i2c-exp.htmThe current draw is minimal so you can interface the board directly to the PSIM with 4 wires.
I also used these chips to build a keypad and a single control for adjusting program parameters. It operates best with a LCD which can be used to expand the PSIM as well. Jan Czmok built his PSIM with the LCD integrated into the same module.
http://www.flickr.com/photos/jczmok/sets/72157603840213105/And, of course, you can always add MIDI to your PSIM.
Dave
--- In ComputerVoltageSources@yahoogroups.com, Andrew Scheidler <oozitron@...> wrote:
>
>
> Hey Bob -
>
> Before you sell it, you might want to check out the MCP23008 chip. David (Brown) got me interested in these. They are an interface chip that the PSIM can talk to. The way I want to use them is to hook 8 toggle switches to the 8 I/O pins of the MCP. Then the PSIM can request a byte from the chip and then knows the status (on or off) of the 8 switches. And the PSIM can be connected with up to 8 of the MCP chips. So you could have 64 toggle switches for real-time input to a program. I'm thinking about a big drum (trigger) sequencer.
>
> Andy
>
>
>
>
>
> To: ComputerVoltageSources@yahoogroups.com
> From: fluxmonk@...
> Date: Fri, 28 Jan 2011 23:36:24 +0000
> Subject: [ComputerVoltageSources] PSIM for sale
>
>
>
>
>
>
> I am considering selling my PSIM; email me w/ offers if interested: rdrake att data2action dott com.
>
> bbob
>
>
>
>
>
> [Non-text portions of this message have been removed]
>