fastled-wasm 1.0.8

FastLED Wasm Compiler

FastLED wasm compiler

Compiles an Arduino/Platformio sketch into a wasm binary that can be run directly in the web browser.

About

This python app will compile your FastLED style sketches into html/js/wasm output that runs directly in the browser.

Compile times are extremely fast - I've seen as low as 5 seconds but 8-15 seconds is typical.

This works on Windows/Linux/Mac(arm/x64).

Docker is required.

https://github.com/user-attachments/assets/bde26ddd-d24d-4a78-90b6-ac05359677fa

Demo

https://zackees.github.io/fastled-wasm/

Install

pip install fastled-wasm

Note that you may need to install x86 docker emulation on Mac-m1 and later, as this is an x86 only image at the prsent.

Use

Change to the directory where the sketch lives and run

fastled-wasm

The compiler should download, compile the target and then launch a web-browser.

Hot reload by default

Once launched, the compiler will remain open, listening to changes and recompiling as necessary and hot-reloading the sketch into the current browser.

This style of development should be familiar to those doing web development.

Data

If you want to embed data, then do so in the data/ directory at the project root. The files will appear in the data/ director of any spawned FileSystem or SDCard.

About the compilation.

Pre-processing is done to your source files. A fake Arduino.h will be inserted into your source files that will provide shims for most of the common api points.

Revisions

• 1.0.8 - Allow more than one fastled-wasm browser instances to co-exist by searching for unused ports after 8081.
• 1.0.7 - Docker multi image build implemented, tool now points to new docker image compile.
• 1.0.6 - Removed --no-open and --watch, --watch is now assumed unless --just-compile is used.
• 1.0.5 - Implemented --update to update the compiler image from the docker registry.
• 1.0.4 - Implemented --watch which will watch for changes and then re-launch the compilation step.
• 1.0.3 - Integrated live-server to launch when available.
• 1.0.2 - Small bug with new installs.
• 1.0.1 - Re-use is no longer the default, due to problems.
• 1.0.0 - Initial release.