Four wheel NodeBot control

gistfile1.js

var five = require("johnny-five");
var board = new five.Board();

var stdin = process.stdin;
stdin.setRawMode(true);
stdin.resume();

board.on("ready", function () {
    var wheels = {
        frontLeft: new five.Servo({ pin: 4, type: 'continuous' }),
        frontRight: new five.Servo({ pin: 5, type: 'continuous' }),
        backLeft: new five.Servo({ pin: 2, type: 'continuous' }),
        backRight: new five.Servo({ pin: 3, type: 'continuous' }),

        stop: function () {
            wheels.frontLeft.center();
            wheels.frontRight.center();
            wheels.backLeft.center();
            wheels.backRight.center();
        },
        forward: function () {
            wheels.frontLeft.cw();
            wheels.frontRight.cw();
            wheels.backLeft.ccw();
            wheels.backRight.cw();
            console.log("goForward");
        },
        pivotLeft: function () {
            wheels.frontLeft.ccw();
            wheels.backLeft.cw();
            wheels.frontRight.cw();
            wheels.backRight.cw();
            console.log("turnLeft");
        },
        pivotRight: function () {
            wheels.frontLeft.cw();
            wheels.backLeft.ccw();
            wheels.frontRight.ccw();
            wheels.backRight.ccw();
            console.log("turnRight");
        },
        back: function () {
          wheels.frontLeft.ccw();
          wheels.frontRight.ccw();
          wheels.backLeft.cw();
          wheels.backRight.ccw();
        }
    };

    wheels.stop();
    console.log("Use the cursor keys or ASWD to move your bot. Hit escape or the spacebar to stop.");

    stdin.on("keypress", function(chunk, key) {
        if (!key) return;

        switch (key.name) {
        case 'up':
        case 'w':
            wheels.forward();
            break;

        case 'down':
        case 's':
            wheels.back();
            break;

        case 'left':
        case 'a':
            wheels.pivotLeft();
            break;

        case 'right':
        case 'd':
            wheels.pivotRight();
            break;

        case 'space':
        case 'escape':
            wheels.stop();
            break;
        }
    });
});