# 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 / enhancements.

Repository: https://github.com/FastLED/FastLED
Canonical: https://ross.abutalabs.com/products/fastled
Homepage: https://fastled.io
Language: C++
License: MIT
License Family: permissive
Topics: addressable-leds, apa102, arduino, embedded, esp32, led, teensy, ws2812
Last push: 2026-08-26T04:34:36+00:00

## Health v2 (maintenance only)
Score: 96/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 89, longevity 100
- inputs: {"age_days": 4680, "days_push": 7, "days_rel": 79, "gap_med": 7.0, "n_releases_24m": 29}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7476, forks 1755 (observed 2026-08-28T04:10:00.167360+00:00)

## What it is
FastLED is a fast, efficient C++ library for controlling addressable LED strips and pixels (WS2812/Neopixel, APA102, LPD8806, and many more) on Arduino and embedded microcontrollers. It provides RGB/HSV color handling, brightness control, fast math functions, and background rendering across 50+ platforms including ESP32, Teensy, and Raspberry Pi.

## Use cases
- animate ws2812/neopixel led strips on arduino
- drive thousands of addressable leds from esp32
- create rgb led animations for art installations
- control led strips on teensy with parallel output
- add hsv color effects to a microcontroller project
- blink and fade led pixels on attiny chips

## When to choose
- you need to drive addressable LED strips on Arduino, ESP32, Teensy, or other microcontrollers
- you want high performance, wide chipset support, and a mature, popular library
- you need HSV color math, brightness control, or background rendering for LED animations

## When to avoid
- you are controlling non-addressable (dumb) RGB LEDs via PWM
- your project is not on a supported embedded/Arduino platform
- you need a higher-level animation framework with a scene graph rather than a driver library

## Facets
- artifact type: library
- maturity: stable
- function: embedded, graphics, animation
- domain: embedded-systems, hardware, graphics
- platform: embedded, cpp, iot, cross-platform
- tags: led, addressable-leds, ws2812, neopixel, apa102, arduino-library, rgb, hsv

## Member repositories
- FastLED/FastLED (main) score 96

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:00.167360+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:37:36.434286+00:00, confidence not recorded.
  - readme: https://github.com/FastLED/FastLED (fetched 2026-08-28T04:10:00.167360+00:00, sha 7f971a470a2c)
  - homepage: https://fastled.io (fetched 2026-08-29T08:32:53.880649+00:00, sha 8d9aa07cd1dc)
  - site_page: http://fastled.io/docs (fetched 2026-08-29T08:32:53.885256+00:00, sha 961c07b70e31)
  - site_page: http://fastled.io/releases (fetched 2026-08-29T08:32:53.883261+00:00, sha 9d118aa80dca)
- Data as of 2026-08-30T08:39:29.467469+00:00.