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LONDON UK
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just wondering if there are any usefull projects using 2 UNOs .from what i read they are mostly simple master and slave ideas ,but need something more complex , meaty and involved .
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Why don't you tell us what your "meaty, complex, involved" project is. When it comes to making two Arduinos communicate, each message is handled separately, which is pretty simple.
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Im currently working on an RS485 connection between arduinos
see
Arduino RS485 communication for home automation project - under networking on this forum
Im using a PC as a host to communicate with a master which in turn will communicate with up to 32 slave devices/arduinos
see Nick gammons page
http://www.gammon.com.au/forum/?id=11428
J.
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The Big Bagpipe has a number of arduinos connected together  http://www.thebigbagpipe.com/home/concept

At one time there was a  "dual core" DIY Drone http://diydrones.com/profiles/blog/show?id=705844:BlogPost:40459

Someone also made an "ExtraCore library for Arduino"  http://hackaday.com/2012/08/31/dual-core-arduino-for-more-pins/
« Last Edit: February 09, 2013, 11:44:29 am by Denbo » Logged

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just wondering if there are any usefull projects using 2 UNOs .from what i read they are mostly simple master and slave ideas ,but need something more complex , meaty and involved .


You could use I2C:

http://www.gammon.com.au/i2c

You can make either one the master (not at the same time of course). You could "broadcast" to multiple slaves.
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