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Home › Experiment: I2C communication between two Arduino boards
Thu, 10/30/2008 - 16:37 — Anonymous

Shared VCC isn't required

IMPORTANT The VCC and the Ground need to be shared by both circuits, otherwise the communication won't work.

You could opto-isolate them instead:

http://www.standardics.nxp.com/products/p82b/datasheet/p82b96.pdf

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