# ExpressLRS/ExpressLRS

High Performance Open Source Radio Control Link

Repository: https://github.com/ExpressLRS/ExpressLRS
Canonical: https://ross.abutalabs.com/products/expresslrs
Language: C
License: GPL-3.0
License Family: copyleft
Topics: rc, lora, esp8266, esp32, fpv, quadcopter, remote-control, sx1280, sx1276, drone, lr1121
Last push: 2026-08-26T08:31:48+00:00

## Health v2 (maintenance only)
Score: 93/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 81, longevity 100
- inputs: {"age_days": 2893, "days_push": 7, "days_rel": 47, "gap_med": 37, "n_releases_24m": 14}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 5286, forks 1508 (observed 2026-08-28T04:09:14.233163+00:00)

## What it is
ExpressLRS is an open source radio control link firmware for RC applications, built on Semtech SX127x/SX1280 LoRa hardware with Espressif or STM32 processors. It provides best-in-class range and latency for FPV racing and long-range drone flying, supporting 900 MHz and 2.4 GHz links with packet rates up to 1000 Hz.

## Use cases
- fly FPV drones with a low-latency long-range RC link
- build a custom 900 MHz or 2.4 GHz radio control link
- flash TX and RX hardware with high-performance RC firmware
- get long range control link for quadcopter racing
- replace stock RC link with open source LoRa-based system
- configure packet rates up to 1000 Hz with EdgeTX

## When to choose
- you need maximum range and low latency for FPV or long-range flying
- you want an open source, community-maintained RC link with broad hardware support
- you fly with EdgeTX and want high packet rates

## When to avoid
- you need a plug-and-play commercial link with vendor support and no flashing
- your use case is not radio control (e.g., general IoT telemetry)
- you require non-LoRa modulation or proprietary protocols

## Facets
- artifact type: application
- maturity: active
- function: embedded, networking
- domain: hardware, iot, cross-platform
- platform: embedded, iot
- tags: radio-control, lora, fpv, drone, rc-link, firmware, sx1280, sx1276, lr1121, quadcopter, esp8266, stm32

## Member repositories
- ExpressLRS/ExpressLRS (main) score 93

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:14.233163+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 2026-08-29T17:59:15.355795+00:00, confidence not recorded.
  - readme: https://github.com/ExpressLRS/ExpressLRS (fetched 2026-08-28T04:09:14.233163+00:00, sha 1f90a0ff6a92)
- Data as of 2026-08-30T08:39:29.467469+00:00.