Hello all, I recently bought a couple of MCP23017 i2c port expanders from adafruit to drive 16 LEDs for my very first arduino project (a newbie). My inputs are 16 (maybe more) piezo sensors connected to the "mux shield". When a piezo is struck it sends a midi Note. So each sensor correlates to a spe…

Help using MCP23017 & Adafruit-MCP23017-Arduino-Library

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