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GitHub - FastLED/FastLED: The FastLED library for colored LED animation on Arduino. Please direct questions/requests for help to the FastLED Reddit community: http://fastled.io/r We'd like to use github "issues" just for tracking library bugs

Transform any microcontroller into an LED powerhouse.

Drive 30,000+ LEDs on high-end devices • Sub-$1 compatibility on tiny chips • Background rendering for responsive apps • Nearly every LED chipset supported • #2 most popular Arduino library

The build system is undergoing optimization and some builds may appear red during migration. Despite any red status, everything still works.

Core Boards:

ARM Boards: *

ATtiny Series: **

*Notes: * Giga-R1 support added in 3.9.14 • ** ATtiny4313 has limited memory (WS2812 Blink + APA102 examples only)

Standard Models:

Special Features:

*Note: NRF52 XiaoBLE board has mbed engine but doesn't compile against Arduino.h for unknown reasons.

*Beta support added in 3.10.2

*Note: STM103TB has limited PlatformIO support

ESP8266:

ESP32 Classic:

ESP32 S-Series:

ESP32 C-Series: *

ESP32 Advanced:

Special Features:

Legacy:

*Notes: * ESP32-C2 support added in 3.9.10 • Espressif compatibility evaluation

x86:

WebAssembly:

Core Platforms:

Teensy Platforms:

#include <FastLED.h>
#define NUM_LEDS 60
CRGB leds[NUM_LEDS];

void setup() { 
  FastLED.addLeds<WS2812, 6>(leds, NUM_LEDS); 
}

void loop() {
  leds[0] = CRGB::Red; FastLED.show(); delay(500);
  leds[0] = CRGB::Blue; FastLED.show(); delay(500);
}

✅ Works on Arduino, ESP32, Teensy, Raspberry Pi, and 50+ other platforms

🎯 Performance: Zero-cost global brightness • High-performance 8-bit math, memory efficient on platforms that need it. 🔧 Developer Experience: Quick platform switching • Extensive examples • Active community support

• 🆕 Latest Feature
• ⭐ Community Growth
• 🆕 Latest Features
• 🌍 Platform Support
• 📦 Installation
• 📚 Documentation & Support
• 🎮 Advanced Features
• 🤝 Contributing

Advanced animation framework for complex LED visualizations and effects.

Multi-layer compositing & time-based animation control for tech-artists.

📺 Live Demos • 📋 Full Changelog

Video:

Lots of improvements in this release, read the full change list here

• This demo -> FxWave2d
  • Wave Simulation Library
• FireCylinder
  • Wraps around so that (0,y) ~= (width-1,y)
• TimeAlpha
  • Precision control of animations with time-based alpha transition.

*Note some users find that newer versions of the ESP32 Arduino core (3.10) don't work very well, but older versions do, see issue 1903

• Teensy 4.1: 50 parallel pins
• Teensy 4.0: 42 parallel pins

Update: max overclock has been reported at +70%: https://www.reddit.com/r/FastLED/comments/1gkcb6m/fastled_FASTLED_OVERCLOCK_17/

FastLED supports 50+ platforms! From sub-$1 ATtiny chips to high-end Teensy 4.1 with 50 parallel outputs.

• 🎯 Arduino + PlatformIO Starter - Best of both worlds, works with both IDEs
• 🚀 FastLED Examples - 100+ ready-to-run demos
• 🌐 Web Compiler - Test in your browser

After installing the Arduino IDE, add FastLED through the Library Manager:

Need Help? Visit r/FastLED - thousands of knowledgeable users and extensive solution history!

Note: Some ESP32 Arduino core versions (3.10+) have compatibility issues. Older versions work better - see issue #1903

Custom shift register boards can achieve extreme parallel output:

• ESP32DEV: 120-output virtual driver
• ESP32-S3: 120-output S3 driver

FastLED supports virtually every LED chipset available:

RGBW Support: WS2816 and other white-channel LED strips • Overclocking: WS2812 up to 70% speed boost

More details: Chipset Reference Wiki

#define LED_TYPE APA102HD  // Enables hardware gamma correction
void setup() {
  FastLED.addLeds<LED_TYPE, DATA_PIN, CLOCK_PIN, RGB>(leds, NUM_LEDS);
}

Read more: APA102 HD Documentation • Rust Implementation

Ready to contribute? FastLED welcomes code contributions, platform testing, documentation improvements, and community support.

Zero pain setup - can be done from command line in seconds with uv or python:

Steps:

1. Fork the repository on GitHub
2. Clone your fork locally: git clone https://github.com/yourusername/FastLED.git
3. Test compilation: bash compile (select your target platform)
4. Make your changes and test
5. Push to your fork and create a pull request

See our detailed Contributing Guide for more information.

Use the compile script to test on 20+ platforms:

• Teensy series, ESP32 variants, Arduino family, ARM boards, and more
• Automated testing ensures compatibility across all supported platforms

Platform Porting: Information on porting FastLED to new platforms: PORTING.md

What's in the name? Originally "FastSPI_LED" focused on high-speed SPI, but evolved to support all LED types and became "FastLED" - everything fast, for LEDs.

Official Site: fastled.io - documentation, issues, and news

In Memory of Daniel Garcia Daniel Garcia, the brilliant founder of FastLED, tragically passed away in September 2019 in the Conception dive boat fire alongside his partner, Yulia. This heartbreaking loss was felt deeply by the maker and developer community, where Daniel's contributions had left an indelible mark.

Daniel was more than just a talented programmer; he was a passionate innovator who transformed the way creators interacted with LED technology. His work on FastLED brought high-performance LED control to countless projects, empowering developers to craft breathtaking installations.

In his personal life, Daniel was known for his kindness and creativity. His pride in FastLED and the vibrant community it fostered was a testament to his dedication to open-source development and his commitment to helping others bring light into the world.

While Daniel is no longer with us, his legacy continues through the FastLED library and the countless makers who use it. The community he built serves as a living tribute to his ingenuity, generosity, and the joy he found in sharing his work with the world.

Zach Vorhies, the current main contributor to FastLED, briefly worked with Dan in 2014 in San Francisco and was an avid user of the FastLED library for over 13 years. After Daniel Garcia’s untimely passing, Zach stepped up to ensure FastLED’s continued growth and development.

Zach has this to say about FastLED:

"The true power of FastLED lies in its ability to transform programmers into LED artists. Free space becomes their canvas; bending light is their medium. FastLED is a collective effort by programmers who want to manifest the world that science fiction writers promised us. -- To contribute code to FastLED is to leave behind a piece of something immortal."

💫 In memory of Daniel Garcia and the vision that transforms programmers into LED artists

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