Using node-hid and robotjs to map the Nimbus Bluetooth controller buttons / joystick to keyboard buttons (Node 8)

nimbus-controller.js

const HID = require('node-hid')
const robot = require('robotjs')
const throttle = require('lodash.throttle')

const devices = HID.devices()
const emptyBuffer = Buffer.allocUnsafe(17).fill(0)

const toggleMap = new Map([['LU', false], ['LR', false], ['LD', false], ['LL', false], ['RU', false], ['RR', false], ['RD', false], ['RL', false]])

const nimbusData = devices.filter(({ product }) => product === 'Nimbus')[0]

const nimbus = new HID.HID(nimbusData.path)

function checkToggle(key, threshold) {
  const active = toggleMap.get(key)
  if (active && threshold) {
    toggleMap.set(key, false)
    return 'up'
  }
  toggleMap.set(key, true)
  return 'down'
}

function pickLeftOrRight(key, value) {
  if (value < 128) {
    console.log('You hit Analog RIGHT')
    console.log(value)
    if (key === 13) {
      const toggle = checkToggle('LR', value < 75)
      return robot.keyToggle('z', toggle)
    }
    const toggle = checkToggle('RR', value < 75)
    return robot.keyToggle('n', toggle)
  }

  console.log('You hit Analog LEFT')
  console.log(value)
  if (key === 13) {
    const toggle = checkToggle('LL', value > 175)
    return robot.keyToggle('c', toggle)
  }
  const toggle = checkToggle('RL', value > 175)
  return robot.keyToggle('k', toggle)
}

function pickUpOrDown(key, value) {
  if (value < 128) {
    console.log('You hit Analog UP')
    console.log(value)
    if (key === 14) {
      const toggle = checkToggle('LU', value < 75)
      return robot.keyToggle('f', toggle)
    }
    const toggle = checkToggle('RU', value < 75)
    return robot.keyToggle('m', toggle)
  }

  console.log('You hit Analog DOWN')
  console.log(value)
  if (key === 14) {
    const toggle = checkToggle('LD', value > 175)
    return robot.keyToggle('v', toggle)
  }
  const toggle = checkToggle('RD', value > 175)
  return robot.keyToggle('l', toggle)
}

nimbus.readData = function (buffer) {
  if (buffer.equals(emptyBuffer)) {
    return
  }

  const bufMap = new Map(buffer.entries())
  bufMap.forEach((value, key) => {
    if (value) {
      switch (key) {
        case 0:
          console.log('You pressed UP')
          robot.keyTap('up')
          break;
        case 1:
          console.log('You pressed RIGHT')
          robot.keyTap('right')
          break;
        case 2:
          console.log('You pressed DOWN')
          robot.keyTap('down')
          break;
        case 3:
          console.log('You pressed LEFT')
          robot.keyTap('left')
          break;
        case 4:
          console.log('You pressed A')
          robot.keyTap('a')
          break;
        case 5:
          console.log('You pressed B')
          robot.keyTap('b')
          break;
        case 6:
          console.log('You pressed X')
          robot.keyTap('x')
          break;
        case 7:
          console.log('You pressed Y')
          robot.keyTap('y')
          break;
        case 8:
          console.log('You pressed L1')
          robot.keyTap('q')
          break;
        case 9:
          console.log('You pressed R1')
          robot.keyTap('e')
          break;
        case 10:
          console.log('You pressed L2')
          robot.keyTap('w')
          break;
        case 11:
          console.log('You pressed R2')
          robot.keyTap('r')
          break;
        case 12:
          console.log('You pressed START')
          robot.keyTap('space')
          break;
        case 13:
          pickLeftOrRight(key, value)
          break;
        case 14:
          pickUpOrDown(key, value)
          break;
        case 15:
          pickLeftOrRight(key, value)
          break;
        case 16:
          pickUpOrDown(key, value)
          break;
        default:
          console.log('Not sure what you pressed: ', key)
      }
    }
  })
}

nimbus.on('data', throttle(nimbus.readData, 200))

package.json

{
  "name": "nimbus-controller",
  "version": "1.0.0",
  "description": "",
  "main": "nimbus-controller.js",
  "scripts": {
    "start": "node nimbus-controller.js"
  },
  "keywords": [],
  "author": "Hipsterbrown",
  "license": "MIT",
  "dependencies": {
    "lodash.throttle": "^4.1.1",
    "node-hid": "^0.5.4",
    "robotjs": "^0.4.7"
  }
}