AVR-Chat

Thanks a lot for all sugestions, I will take somewhat like Roberts 
solution becouse its simple and low cost, but Im beginning with 
microcontrollers, so I will put to study and work hard for resolve 
the problem.

In my country I cant buy a Tinys, but I will use atmega8.

Thanks again.



--- In AVR-Chat@yahoogroups.com, Robert Rademacher <robertrade@y...> 
wrote:
> Hi,
> 
> >> Try the MAX3110E spi uart.  Makes it simple to add as many real
> >> hardware uarts as you need to any project.
> 
> Too Pricy. If they lowered that MAX3110E price to $2.00, I'll use 
it. 
> 
> But, read on below...
> 
> Try this suggestion:
> 
> Master AVR micro (Mega8 or better with large Flash ROM) connected to
> slave AVR micros via SPI. Recommended slave AVR micros:
> 
> ATTINY2313 (SPI and full duplex UART)
> with MAX232 and caps
> 
> Cost: $2.00-$3.00 TOTAL PER RS-232 PORT.
> 
> Each ATTINY2313 slave micro is written with full interrupted UART to
> capture the data into RAM buffer (up to 64). 
> 
> Master AVR (Mega8 or whatever) polls these slave AVR micros to see 
if
> there are serial data stored in these buffer and then read off from
> there.
> 
> Pretty simple and efficient.
> 
> Hope it helps.
> 
> Robert
> 
> 
> 
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