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Bluejay

  • Software
  • Drones and boats
  • Firmware

Bluejay is open source digital ESC firmware for controlling brushless motors in multirotors, a successor to BLHeli_S. It targets ESCs with Busy Bee MCUs.

Made by bird-sanctuary.

Source on GitHub: github.com/bird-sanctuary/bluejay (opens in a new tab). Facts read at commit 0368d11 (opens in a new tab).

Licenses

Code
GPL-3.0-only (opens in a new tab)

Read by Robotheca from COPYING (opens in a new tab) (GPL-3.0-only) at commit 0368d11 (opens in a new tab), on 16 Oct 2026.

Commercial use
Yes

Copyleft: Modified source must be published.

What it does

  • Supports DShot 300 and 600 digital signal protocols.
  • Offers bidirectional DShot with RPM telemetry and extended DShot telemetry.
  • Lets users choose PWM frequency of 24, 48 or 96 kHz.
  • Provides startup power configuration and RPM protection.
  • Reduces commutation interference and smooths throttle-to-PWM conversion.
  • Allows user configurable startup tunes.

Written by Robotheca from the project's README (opens in a new tab) at commit 0368d11.

Getting started

Difficulty
Intermediate
Hardware it needs, as the project states it
Runs on SiLabs EFM8 BB21 and BB51 microcontrollers in ESCs; BLHeli_S compatible ESCs can be flashed. The BB10 (L layout) is deprecated and no longer officially supported.

Maintenance

Status
Maintained: a commit in the last 12 months
Newest commit
22 Apr 2026 on main
Latest release
v0.21.0 (19 Jul 2024)

Checked on GitHub on 16 Oct 2026.

Links

Robots on Robotheca that use it

No robot on Robotheca is linked to it yet. Links come from a robot's robot.yaml, from its dependency files read as text, or from Robotheca's editors.

Robotheca lists software as a reference: nothing is hosted or run here, and every fact links to where it was read.