FastLED - The Universal LED Library for Embedded and Arduino

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

⚡ Get Blinking in 30 Seconds

#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

📖 Just Getting Started?

See our Cookbook for tutorials and walkthroughs →

The FastLED Cookbook provides practical guides, step-by-step examples, and copy-paste recipes to help you create stunning LED effects - from your first blink to advanced animations.

🚀 Why FastLED?

🎯 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

📂 Source Code Directory Structure

FastLED's codebase is organized into several major areas. Each directory contains a README with detailed documentation:

Table of Contents

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

📊 Detailed Build Status

Emulation Tests

ESP32 (QEMU):

AVR (AVR8JS):

Arduino Family

Core Boards:

ARM Boards:

ATtiny Series: *

*Note: ATtiny4313 has limited memory (WS2812 Blink + APA102 examples only)

Teensy Series

Standard Models:

Special Features:

NRF52 (Nordic)

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

Apollo3 (Ambiq)

*Beta support added in 3.10.2

STM32 (STMicroelectronics)

Silicon Labs (SiLabs)

*MGM240 (EFR32MG24) support for Arduino Nano Matter, SparkFun Thing Plus Matter, and Seeed Xiao MG24 Sense boards

Raspberry Pi Pico

ESP32 (Espressif)

ESP8266:

ESP32 Classic:

**ESP3