DigiSpark i2C

[last updated: 2016-08-19]
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I want to set up i2C communication between DigiSpark boards.
I'm just starting the research/development process ...
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I see my installation of DigiSpark on Arduino IDE 1.6.10 has a TinyWireM library to be used in a "master" configuration. This is used like for driving a 16x2 LCD screen. But I have to find a TinyWireS library for a slave unit, that was referred to in one of the forums.

Successfully downloaded same from GitHub. Unzipped and coped to Documents/Arduino/Libraries

Struggling to get libraries to work. I'm still pretty low on the learning curve. Decided to get i2C up and running on Uno's first, which should be more straight-forward.
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Update:

Somewhere in the process I went back to IDE 1.6.9.
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Hardware note: be sure to use 4.7k (for 5v) pullup resistors on the I2C lines.
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Software:
Current rev of sketch - see: programs, all
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