gistfile1.js

var five = require("johnny-five");
var Spark = require("spark-io");
var keypress = require('keypress');

var board = new five.Board({
  io: new Spark({
    token: "{YOURS}",
    deviceId: "{YOURS}"
  })
});

board.on("ready", function() {

  console.log("Welcome to Sumobot Jr!")
  console.log("Control the bot with the arrow keys, and SPACE to stop.")

  var left_wheel  = new five.Servo({ pin: "D5", type: "continuous" }).stop();
  var right_wheel = new five.Servo({ pin: "D6", type: "continuous"  }).stop();
  var led = new five.Led("D7");

  process.stdin.resume(); 
  process.stdin.setEncoding('utf8'); 
  process.stdin.setRawMode(true); 

  process.stdin.on('keypress', function (ch, key) {
    
    if ( !key ) return;


    if ( key.name == 'q' ) {

      console.log('Quitting');
      process.exit();

    } else if ( key.name == 'up' ) {

      console.log('Forward');
      left_wheel.ccw();
      right_wheel.cw();

    } else if ( key.name == 'l' ) {

      led.on();      

    } else if ( key.name == 'down' ) {

      console.log('Backward');
      left_wheel.cw();
      right_wheel.ccw();      

    } else if ( key.name == 'left' ) {

      console.log('Left');
      left_wheel.ccw();
      right_wheel.ccw();      


    } else if ( key.name == 'right' ) {

      console.log('Right');
      left_wheel.cw();
      right_wheel.cw();

    } else if ( key.name == 'space' ) {

      console.log('Stopping');
      left_wheel.stop();
      right_wheel.stop();
      led.off();

    }

  });

});

When/if you have a chance, can you try this: https://gist.github.com/rwaldron/0e34f40e65c60530ea14 with the latest version of Johnny-Five. Warning: I have literally not tested this code at all whatsoever ;)