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Compiling WLED

You want to add custom features to WLED, use non-default pins, or add in a usermod? You've found the right place!

WLED has come to rely on so many dependencies in the latest versions that building with Visual Studio Code and its PlatformIO (PIO) extension is the recommended way. It will install the ESP Arduino core, all the required libraries and the correct compilation settings for you automatically. The Arduino IDE is no longer recommended.

If you don't want to change the code but only add some compile options and/or usermods, you can use bot on discord or compile with just few clicks using this inofficial web based wled compiler. Using it you can download the resulting .bin file directly or install via USB using built-in web-based installer.

Preparations

  1. Make sure Git client is installed on your system. If it isn't, you can get it here.
  2. Also make sure that you have Node.js 20 or higher installed.
  3. Download the WLED source code by executing git clone https://github.com/wled/WLED.git in some folder. (You can also use GitHub Desktop or download the latest source code from https://github.com/wled/WLED under the Code dropdown menu as a .zip file.) Alternatively fork the WLED project first and download it from your fork.
  4. Go into the WLED folder by executing cd WLED.
  5. Install all dependencies by executing: 
    npm install
  1. Download and install the free Visual Studio Code by Microsoft.
  2. Open VS Code and go to the Extensions manager (the icon with the stacked blocks in the left bar)
  3. Search for platformio ide and install the PlatformIO extension
  4. In VS Code go to File -> Open Folder and open that root WLED folder (the one that contains platformio.ini, NOT the wled00 folder)

Compilation guide (PlatformIO)

Tip

Make sure Git Client is installed on your system. You can get it here.

  1. In VS Code, open the file platformio.ini.
  2. Add a semicolon in front of the line that start default_envs = to comment it out.
  3. Select your build environment by un-commenting one of the lines starting with ; default_envs =. Please remove BOTH the ; and the whitespace behind it to correctly uncomment the line. For most ESP8266 boards, the d1_mini environment is best.
  4. In the blue bottom bar, hit the checkmark to compile WLED or the arrow pointing right to compile and upload!

Picture Guide

Success!

If you get one of these two errors, hit the checkmark icon once again to compile and that time the code should build without problems!

  • error: wled00\wled00.ino.cpp: No such file or directory
  • FileNotFoundError: [WinError 2] The system cannot find the file specified: '[...].sconsign37.dblite'

Making a custom environment

Once you've confirmed VSCode with Platformio is set up correctly, you can add/define overrides to allow you to use non-default pins, add a usermod, or add other custom features.

  1. Copy and paste the contents of platformio_override.ini.sample into a new file called platformio_override.ini. Make sure platformio_override.ini is in the same folder as platformio.ini.
  2. Replace the line default_envs = WLED_tasmota_1M with the line you uncommented in platformio.ini in the previous steps (from Compilation guide (PlatformIO)). Example: default_envs = d1_mini
  3. In platformio.ini scroll down until you see 
    #--------------------
# WLED BUILDS
#--------------------
  4. Find the section that matches the build environment you selected in previous steps. Example: [env:d1_mini]
  5. Select the whole section (including the first line in brackets [ ] ), and copy and paste it into platformio_override.ini overwriting the build environment section that was already there.
  6. Add a new line under the the line that starts with build_flags =
  7. Put your -D overrides on this new line, giving each -D it's own new line.
  8. Compile your freshly customized WLED image!

Adding usermods

To include one or more usermods in your build, add a custom_usermods line to your environment in platformio_override.ini:

[env:esp32dev_temperature]
extends = env:esp32dev
custom_usermods =
  audioreactive
  Temperature

Each name corresponds to a folder under usermods/. No other file editing is required — usermods self-register when compiled in. For full details, including how to add external usermods from a git repository and how to write your own, see Custom Features.

Flashing the compiled binary

Tip

This step is optional and only recommended if you want to install the same binary to multiple boards. For testing, it is easiest to upload directly from PlatformIO

The .bin file is located in the subfolder /build_output/firmware in your WLED folder. The binary will have the same name as your environment.

All that's left to do is flash this .bin file onto your ESP board and then connect it to WiFi.