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Hi Craig,

> In the function <i2c the code begins with twi.start 1+ twi.tx 1-
> dup 0 >
> 
> Is the 1+ a typo? If not I do not understand why you would add one
> to the hardware address before sending it out.

This is the way some (most?, all?) i2c devices distinguish between read
and write access. The datasheet for your i2c device should tell you the
details

Matthias

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