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Cave Pearl data loggers

Published October 16, 2020 at 640 × 475 in Pro Mini Classroom Datalogger [2020 No-Solder Update].

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A4 & A5 I2C bus bridged to side rails

Adding DIDR0 = 0x0F; in Setup disables digital I/O on pins A0-A3 so they don’t interfere with I2C bus coms.

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