expanded dmg button pcb (i2c version)

this is a button breakout board which utilizes I2C protocol via a MCP23017 IC. features: d-pad, start, select, A, B, X, and Y buttons available (breakout header for L1, L2, R1, and R2) gold-immersion PCB treatment fully compatible with our silicone buttons (including 2x A/B parts) side solder points for connection of 2x Left and 2x Right buttons, with GND connections fits into standard DMG shell 1.0mm thickness matte black finish uses well-documented MCP23017 IC two solder jumpers (use 0ohm 0603 resistor) for changing IC address to 0x20 or 0x21 -- ships as 0x20 here is code for arduino to test or for reference. button presses appear in the serial monitor stream. here is a drill template for adding holes for the X and Y buttons to your console shell. pinout: GPA2 — B GPA3 — A GPA4 — R2 GPA5 — R1 GPA6 — X GPA7 — Y GPB0 — UP GPB1 — L1 GPB2 — L2 GPB3 — LEFT GPB4 — RIGHT GPB5 — DOWN GPB6 — SELECT GPB7 — START