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Possible Duplicate:
How to attach an Arduino?

I have ready through this website:

http://mitchtech.net/raspberry-pi-arduino-spi/

which indicates you can get a pi to communicate with an arduino using SPI, but is it possible to do the same with USB?

Is there a tutorial that explains how this can be achieved?

And if it is possible, does this mean the arduino would be powered by the raspberry pi?

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I can't think of any reason you couldn't. All you would need to do is learn how to communication over serial connections in linux. If you're drawing a lot of power you should use powered usb hub.

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