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The Expander Plug is a small board with 8 general-purpose digital I/O lines. Each of the lines can be configured individually as input (with optional 100 kΩ pull-ups) or as output. The 2×6-pin connection carries the 8 I/O signals, +3.3V and ground, as well as the raw PWR voltage and the IRQ line.
An I2C bus running at 3.3V is used as inte
