Maimai buttons

This is a firmware to use Maimai arcade buttons.

Maimai buttons are photointerrupters instead of the usual microswitches, with a normally closed logic.

Wiring/pinout

Each button has 3 wires, black red and orange

• Daisychain all black wires to Arduino GND

• Daisychain all red wires to Arduino 3.3V or 5V

• Wire buttons 1 to 8 orange wires to Arduino gpio 2 to 9

• (optional) wire an additional regular microswitch on gpio 10 and GND

Behavior

• maimaiKeyboard maps buttons 1 to 8 to qwedcxza keys (ie. clockwise starting from top left), button 9 to 's'

• maimaiJoystick maps them to joystick button 1 to 9