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Norway@Oslo
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Hey!  Norwegian university student, just ordered an Arduino Diecimila.

1st question, how to make two Arduinorobots communicate and act according to the info the other outputs. ?

How to expand digital\analog I/Os ?  [do I need another microprocessor, is there any limit in I/Os?]


Excause my n00b....ness? 8-)
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Copenhagen / Denmark
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Are the robots going to be moving around, then i think the Blue tooth Arduino board might be a good solution.

For expanding Digital or analog In / out puts see here:

http://www.freeduino.org/#index  

look under M for Multiplexing, there you will find links to a number of articles about expanding the number of analog and digital input and outputs.
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Brisbane, Australia
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A alternative to bluetooth is wire up a infrared receiver and led.
You'll have to write the protocol yourself however.
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