SNES to GameCube adapter

Code for building a SNES to GameCube controller adapter. Also works with the 8Bitdo SN30 2.4g wireless gamepad And the 8Bitdo Retro Receiver

Software Requirements

• Arduino IDE (tested on 1.8.19)
• Arduino Nintendo Library by NicoHood

Hardware

Parts

• Logic Level Converter 5v <-> 3.3v
• Arduino Nano (5v 16MHz)
• USB -> Serial adapter if your Arduino comes without USB.
• 1kΩ Resistor
• Female SNES controller port (SNES extension cable)
• Male GameCube controller connector (GameCube extension cable)

Wiring

The colors of the wires in the cables may not match between the original controller and the extension cable, below is the mapping for my cables, the colors may be different for you. Be aware that some GameCube extension cables have 2 ground wires instead of 3

SNES pinout

Type	Original Controller	Extension Cable
5v	white	green
clock	yellow	yellow
latch	orange	white
data	red	red
gnd	brown	black

GameCube Pinout

Type	Original Controller	Extension Cable
5v	yellow	white
3.3v	blue	green
data	red	red
gnd	black	black
gnd	white	yellow
gnd	green	blue