At 01:33 PM 11/11/97 +0100, Alessandro Zummo wrote:
>Il 11-Nov-97, Rick Dickinson scrisse:
>
[snip proposal for SSU]
>
>I'm really interested...
>
>>Details to be ironed out include:
>>  -  Protocol for commands, including mode changes
>>  -  Data format for measurement data returned
>>       Inches?
>
>better using cm.

What sort of granularity would be needed, and what is a reasonable maximum
 range?  I want to avoid having to do any sort of AGC, so the range would have
 to be known in advance to set the amp gain on the receiving transducer.

>
>>  -  I2C, SPI, or none of the above
>
>I2c would be fine...
>
>>  -  Baud rate/clocking (async 9600/4800/2400/1200? Autobaud? Sync?)
>
>Fixed, say at 9600...

I have been doing a little bit of design brainstorming, and have an idea or two
 about implementing the interface portion.  I'll write up my ideas in another
 post.

>
>>  -  Distribution mechanism
>>       PIC code/Schematics/PCB layout on web for download?
>>       Preprogrammed PICs and etched PCBs for purchase?
>>       Both?
>
>In my opinion it should first come out in the first version (i.e. on web) and
>then,
> if needed in the second...

I tend to agree.  I'd like to make this a collaborative effort with other
 PIC-Listers, and make the design available freely to anyone with the resources
 to build it.

 - Rick
+--------------------------------+------------------------------+
| Rick "The Notes Guy" Dickinson | Views expressed by the author|
| Lotus Notes & Domino Solutions | are not necessarily those of |
| (818)563-1061 rtd@notesguy.com | Enterprise ArchiTechs.  They |
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