Arduino Program for an Esplora board to play N64 games on an emulator. Upload, install mupen64, and play.

arduino_esplora_mupen64controller.ino

#include <Esplora.h>
#include <Keyboard.h>

boolean buttonStates[4];

const byte buttons[] = {
  SWITCH_RIGHT,
  SWITCH_LEFT,
  SWITCH_UP,
  SWITCH_DOWN
};

const char keystrokes[] = {129, 'X', 'Z', 128};
// Button 1 is B, Button 2 is L, Button 3 is Z, and button 4 is A

void setup() {
  Keyboard.begin();
}

void loop() {
  for (byte thisButton = 0; thisButton < 4; thisButton++) {
    boolean lastState = buttonStates[thisButton];
    boolean newState = Esplora.readButton(buttons[thisButton]);
    if (lastState != newState) {
      if (newState == PRESSED) {
        Keyboard.press(keystrokes[thisButton]);
      }
      else if (newState == RELEASED) {
        Keyboard.release(keystrokes[thisButton]);
      }
    }
    buttonStates[thisButton] = newState;
  }
  // Analog to digital joystick with a 25% deadzone
  if (Esplora.readJoystickY() > 127) {
    Keyboard.press(217);
  } else {
    Keyboard.release(217);
  }
  
  if (Esplora.readJoystickY() < -127) {
    Keyboard.press(218);
  } else {
    Keyboard.release(218);
  }
  
  if (Esplora.readJoystickX() > 127) {
    Keyboard.press(216);
  } else {
    Keyboard.release(216);
  }
  
  if (Esplora.readJoystickX() < -127) {
    Keyboard.press(215);
  } else {
    Keyboard.release(215);
  }
  delay(50);
}