On 9/8/06, William Bulley <web@umich.edu> wrote:
> I am looking for a development board (not a prototype board)
> that is small in size (think credit card or somewhat bigger)
> that can be battery powered, that supports a PIC containing
> four ADC ports and sixteen digital I/O ports with possible
> interface logic.  By battery powered I am thinking of a Li
> coin cell or three.  I am not certain that this is a viable
> product for any vendor, so I likely will not find what I am
> looking for without having to design it myself.  I intend
> to use C (or even Basic) to control the PIC, so the product
> need not have any on-board firmware support (other than a
> possible Basic interpreter).  Either PIC16 vs. PIC18 would
> be acceptable.  Does such a thing exist out there to buy?


  I have designed a long time ago something more or less similar with
your requirement for PIC learning. Just 8 digital inputs, 6AD inputs,
1wire bus and serial communication, everything self powered from
RS232. Some small prototyping area also available. Tested with 100m
CAT5 RS232 cable between board and PC at 4800bps or 5m standard RS232
cable at 115200bps.
Adding another 8 digital inputs and 16 digital outputs is possible if
kill the 1wire bus and make some room in the program memory. Schematic
available on the link:

http://surducan.netfirms.com/module.html

Will fit on a credit card if use SMT including for the IC's.
Suggestion for a bigger memory PIC (even that one is enough with the
newest JalV2 compiler, a quite good and free alternative to your basic
interpreter)

ask Stef if you can't believe...
:)

Vasile
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