... I would like only three wires between modules vcc, ground, and data.
...
You might have a point with the internal pull-up resistor being disrupted with the pin being used as input and output. Try an external on each B0, see how that goes.
Robert
Last edited by Demon; - 5th April 2013 at 21:00.
Reason: Correction to my reply, only 3 wires are indeed required
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