Example of input type button in html?

[Moors7]

That looks an awful lot like some code I once wrote, which was intended to be used with the JavaScript library, which is also why that doesn't work. There's no 'magic Particle parameter'. That 'onclick' simply calls a Javascript function which in turn makes the request.
This guide discusses how to call the API directly, and has an example of what you're looking for:

Tutorial: Spark Variable and Function on One Web Page

Let’s say you have a Spark core with both a Spark variable and a Spark function. In my case, I have the world’s simplest servo control sketch, using the nice miniature servo in the Spark Maker Kit. Using these parts, we will build a servo that you can control from a web page anywhere and monitor the position of the servo too! Here’s a preview of the finished tutorial: [image] There is a coarse adjust slider, two fine adjust buttons, and the current position of the servo is displayed. That…