# bitdump/BLHeli

BLHeli for brushless ESC firmware

Repository: https://github.com/bitdump/BLHeli
Canonical: https://ross.abutalabs.com/products/blheli
Language: Assembly
License: GPL-3.0
License Family: copyleft
Last push: 2025-08-21T07:30:10+00:00

## Health v2 (maintenance only)
Score: 40/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 38, release rhythm 8, longevity 100
- inputs: {"age_days": 5276, "days_push": 377, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2226, forks 1149 (observed 2026-08-28T04:06:28.729899+00:00)

## What it is
BLHeli is open-source firmware for sensorless brushless motor electronic speed controllers (ESCs), written in assembly for Atmel and Silabs 8-bit MCUs, with BLHeli_S and BLHeli_32 variants. It is flashed onto ESC boards used primarily in multirotor and helicopter applications.

## Use cases
- flash firmware onto brushless ESC boards for drones
- configure ESC settings like throttle response for multirotors
- control brushless motors in RC helicopters and planes
- customize motor speed controller behavior for FPV quadcopters

## When to choose
- you need open-source ESC firmware for 8-bit Atmel or Silabs ESC hardware
- you want smooth, configurable throttle response for multirotor motors
- you want to flash and tune ESCs using BLHeliSuite

## When to avoid
- you need open-source firmware for 32-bit ARM ESCs, since BLHeli_32 is closed source
- you need sensor-based (sensored) motor control
- your ESC hardware is not supported by BLHeli or BLHeli_S

## Facets
- artifact type: library
- maturity: maintenance
- function: embedded
- domain: hardware, robotics
- platform: embedded
- tags: esc-firmware, brushless-motor, drone, multirotor, firmware

## Member repositories
- bitdump/BLHeli (main) score 40

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:28.729899+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 2026-08-30T02:44:52.695024+00:00, confidence not recorded.
  - readme: https://github.com/bitdump/BLHeli (fetched 2026-08-28T04:06:28.729899+00:00, sha 06a98aad1bb7)
- Data as of 2026-08-30T08:39:29.467469+00:00.