[dorkbotpdx-blabber] Re: another chip-level question ...

[Eric Garner]

would this do the trick?

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1731/t/al




On Fri, May 15, 2009 at 9:57 AM, Jim Larson <jlarson at pacifier.com> wrote:
> Here's a couple of approaches you might consider.
>
> Approach 1:
> - Provide a MAX232 channel per device (each MAX232 handles two channels).
> - Feed the TTL side into an N-by - two data selector (such as the 4-by-2
> 74HC4052).
> - Select the device you want to talk with and away you go.
> - Works as long as you are willing to ignore input from de-selected devices.
>
> Approach 2:
> - Use a microcontroller (ATtiny2313 would work) on each device. These handle
> the serial (with MAX232s) conversation and could provide buffering of data
> while not selected.
> - Hang them all as slaves on the I2C bus.
> - Your master controller now transceives over the I2C bus and only uses its
> serial link just to talk to your PC host.
>
> Interesting problem.
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-- 
--Eric
_________________________________________
Eric Garner