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HTML

              
                <h1>Prototyping IoT Demo UI</h1>

<button class="on">Blink LED</button>

<script src="//cdn.pubnub.com/pubnub-3.14.5.min.js"></script>
              
            
!

CSS

              
                button {
  font-size: 2em;
  padding: 10px 20px;
}
              
            
!

JS

              
                // Use the same keys that you are going to use for Arduino code with Johnny-Five

var pubnub = PUBNUB.init({
  publish_key: 'pub-c-0b43969b-341d-41f5-a85e-0bd9d30404b8',
  subscribe_key: 'sub-c-cb24903e-c9f4-11e5-b684-02ee2ddab7fe'
});

// Use the same channel name
var channel = 'led';

var button = document.querySelector('button.on');

/*
Setting a state to lable the button.
This example is simplified for the tutorail, however,
in reality, you need to subscribe the channel to set the state, 
rather than toggling the boolian variable.
Why? because multiple people may be accessing this UI to control 
your LED on Arduino! So we need to listen all data coming from the
subscribers of the channel!

See: https://codepen.io/girliemac/pen/jqeqje 
for the completed code
*/

var blinkState = true;

/*
Upon a button click, publish the data.
Arduino will subscribe it and blink LED
*/
button.addEventListener('click', function(e) {
  pubnub.publish({
    channel: channel, 
    message: {blink: blinkState},
    callback: function(m) {
      console.log(m);
      blinkState = !blinkState;
      button.textContent = (blinkState) ? 'Blink LED' : 'Stop LED'; 
    }
  });
  
});
              
            
!
999px

Console