Page 124 - Programming the Photon Getting Started With the Internet of Things

your functions and circuits to make sure everything works as expected. But to get the best
experience out of your projects, it would be much nicer to build a user interface using a
webpage to control the Photon through the Web browser so that when we click a button, it

will turn an LED on or off as shown in Figure 6.6.

Figure 6.6 LED Web browser interface.

When we register a function variable, we are basically making space for it on the
Internet, similar to how you make space for a website that you would navigate to using

your Web browser. We can create a simple Hypertext Markup Language (HTML)
document on your computer with some basic buttons that send commands to the Photon
board:

<center>
<br>
<br>

<br>
<form action="https://api.particle.io/v1/devices/your-device-ID-goes-here/l
ed?access_token=your-access-token-goes-here" method="POST">

Tell your device what to do!<br>
<br>
<input type="radio" name="args" value="on">Turn the LED on.