const sendCommand = (speed, angle) => {
  robot.sendCommand(DRIVE, [uB(speed), lB(speed), uB(angle), lB(angle)])
}
    startByte: 0x03,
    numBytes: 2
  },
  {
    name: 'humidity',
    startByte: 0x02,
    numBytes: 2
  },
  {
    name: 'proximity',
    startByte: 0x02,
    numBytes: 2
  }
]

var robot = new RobotSerialInterface()

// Start the interface...
robot.start(SERIAL_PORT, SERIAL_OPTIONS, SENSORS)

robot.on('temperature', function (temp) {
  console.log('Temperature: %d', temp)
})

robot.on('humidity', function (hum) {
  console.log('Humidity: %d', hum)
})

robot.on('proximity', function (speed) {
  console.log('Proximity: %d', speed)
})