gcpadgates.ino

// attach red pin of GC connector here
#define GC_PIN 7

// attach your gate plugs to these pins
#define GATE1_PIN 1
#define GATE2_PIN 2
#define GATE3_PIN 3
#define GATE4_PIN 4

#include "Nintendo.h"

// Define a Gamecube Controller
CGamecubeController GamecubeController(GC_PIN);

void setup() {
  pinMode(GATE1_PIN, OUTPUT);
  pinMode(GATE2_PIN, OUTPUT);
  pinMode(GATE3_PIN, OUTPUT);
  pinMode(GATE4_PIN, OUTPUT);
}

void loop() {
  // Try to read the controller data
  if (GamecubeController.read()) {
    auto report = GamecubeController.getReport();
    
    // I'm not sure what buttons/axis are hooked to what pads, but here is an example:
    digitalWrite(GATE1_PIN, report.a ? HIGH : LOW );
    digitalWrite(GATE2_PIN, report.b ? HIGH : LOW );
    digitalWrite(GATE3_PIN, report.x ? HIGH : LOW );
    digitalWrite(GATE4_PIN, report.y ? HIGH : LOW );
  }
}