ns-joycon - Bridge between Joy-Con and Node.js

ns-joycon controls buffer stream by HID, and extracts the data from accelerometer, gyroscope and HD Rumble.

This project is an implementation from dekuNukem/Nintendo_Switch_Reverse_Engineering by Node.js.

---

Quick start

Installation

npm install ns-joycon
# If you encounter some problems when `npm install ns-joycon`.
npm install ns-joycon --unsafe-perm

DEMO

Checkout the demo project at wazho/ns-joycon-showcases.

Usage

Connect your Joy-Con(s) using bluetooth with PC (currently Linux only).

And then execute program by administrator below (root can access hardware).

const JoyCon = require('ns-joycon');    // JavaScript
// import * as JoyCon from 'ns-joycon'; // TypeScript or Babel

JoyCon.findControllers((devices) => {
  // When found any device.
  devices.forEach(async (device) => {
    console.log(`Found a device (${device.meta.serialNumber})`);
    // Add a handler for new device.
    device.manageHandler('add', (packet) => {
        console.log(device.meta.product, packet);
    });
    await device.enableIMU();
  });
});

Tests

npm test

---

APIs

JoyCon.findControllers(callback)

Find controllers that are detected.

• Arguments

  callback is of the form callback(devices)

device.manageHandler(action, callback)

Add a handler to process packet data.

• Arguments

  action is add | remove

  callback is of the form callback(data)

device.requestDeviceInfo()

Request Joy-Con to provide its device info.

• Return value

  Promise<DeviceInfo> is { firmwareVersion, type, macAddress, spiColorInUsed }

device.enableIMU()

Enable inertial measurement unit (IMU).

After this script, controller will send Input Report 0x30 per 15 ms.

• Return value

  Promise<void>

device.disableIMU()

Disable inertial measurement unit (IMU).

• Return value

  Promise<void>

device.enableVibration()

Enable vibration for a while.

• Return value

  Promise<void>

device.disableVibration()

Disable vibration in immediately.

• Return value

  Promise<void>

---

Extracted data

Real data from Joy-Con (R) below.

<Buffer 30, 3e, 4e, 0a, 10, 00, 00, 00,
        00, c7, 18, 76, 09, 1a, 00, f1,
        09, d5, f3, b4, ff, 5b, ff, 90,
        ff, 17, 00, de, 09, c7, f3, af,
        ff, 5e, ff, 8f, ff, 0a, 00, cd,
        09, c7, f3, b8, ff, 65, ff, 89,
        ff>

Input Report ID

// inputReportID
{
  "_raw": "<Buffer 30>",
  "_hex": ["30"]
}

Timer

// Timer
{
  "_raw": "<Buffer 2c>",
  "_hex": ["2c"]
}

Battery Level

// batteryLevel
{
  "_raw": "<Buffer 4e>",
  "_hex": ["4"],
  "level": "medium"
}

Connection Info

// connectionInfo
{
  "_raw": "<Buffer 4e>",
  "_hex": ["e"]
}

Button Status

// buttonStatus
{
  "_raw": "<Buffer 00 00 00>",
  "_hex": [ "00", "00", "00" ],
  "y": false,
  "x": false,
  "b": false,
  "a": false,
  "r": false,
  "zr": false,
  "down": false,
  "up": false,
  "right": false,
  "left": false,
  "l": false,
  "zl": false,
  "sr": false,
  "sl": false,
  "minus": false,
  "plus": false,
  "rightStick": false,
  "leftStick": false,
  "home": false,
  "caputure": false,
  "chargingGrip": false
}

Analog Sticks

Stick Left

// analogStickLeft
{
  "_raw": "<Buffer 00 00 00>",
  "_hex": [ "00", "00", "00" ],
  "horizontal": 0,
  "vertical": 0
}

Stick Right

// analogStickRight
{
  "_raw": "<Buffer 70 c8 75>",
  "_hex": [ "70", "c8", "75" ],
  "horizontal": 2160,
  "vertical": 1884
}

Vibrator

// vibrator
{
  "_raw": "<Buffer 0a>",
  "_hex": [ "0a" ]
}

Accelerometers

// accelerometers
[
  {
    "x": {
      "_raw": "<Buffer 67 01>",
      "_hex": [ "67", "01" ],
      "acc": 0.087596
    },
    "y": {
      "_raw": "<Buffer 23 00>",
      "_hex": [ "23", "00" ],
      "acc": 0.00854
    },
    "z": {
      "_raw": "<Buffer 61 f0>",
      "_hex": [ "61", "f0" ],
      "acc": -0.975756
    }
  },
  // Repeat two more, totally collected three times.
]

Gyroscopes

// gyroscopes
[
  [
    {
      "_raw": "<Buffer 17 00>",
      "_hex": [ "17", "00" ],
      "dps": 1.40369,
      "rps": 0.003896
    },
    {
      "_raw": "<Buffer ca ff>",
      "_hex": [ "ca", "ff" ],
      "dps": -3.29562,
      "rps": -0.009148
    },
    {
      "_raw": "<Buffer d8 ff>",
      "_hex": [ "d8", "ff" ],
      "dps": -2.4412,
      "rps": -0.006776
    }
  ],
  // Repeat two more, totally collected three times.
]

[Extra] Actual Accelerometer

Average of 3 times accelerometers.

// actualAccelerometer
{
  "acc": {
    "x": 0.001305,
    "y": 0.000137,
    "z": -0.014623
  }
}

[Extra] Actual Gyroscope

Average of 3 times gyroscopes.

// actualGyroscope
{
  "dps": [ 0.02014, -0.049129, -0.035703 ],
  "rps": [ 0.000056, -0.000136, -0.000099 ]
}