This is a little experimental and I’ve found that support for different web browsers and versions varies.
It tries to use the native browse save capabilites and falls back to a Java Applet if none of those work.
Check the source of
index.html, it currently just creates a list of dropdowns to set the mode of each pin and a text input for the value.
It should be possible to do more complex behaviour - a slider to control PWM intensity, or a bitmap editor writing to an LED Matrix driver - please contribute.
Any questions and suggests please discuss in the forum.