Timecode Bridge

Timecode Bridge is an open-source hardware companion that lets Aria Gen 2 glasses time-align with external LTC-timecoded video and audio equipment — motion capture systems, professional cameras, audio recorders, and similar gear. It receives SMPTE LTC (Linear Timecode) on a BNC input and re-broadcasts the timing on the same sub-1 GHz radio protocol that Aria's built-in Time Domain Mapping already uses.

From the glasses' perspective nothing new needs to be configured. Timecode Bridge simply acts as an additional broadcaster — same protocol, same channels, same regulatory rules. Set the glasses to Receiver mode (Companion App guide or Client SDK guide) and choose the channel and broadcaster ID that the Bridge is transmitting on. Recorded VRS timestamps expose the Bridge's clock through the existing SubGHz TimeDomain queries.

When to use it

• Your recording rig is anchored to a master clock outside the Aria ecosystem — a mocap system generating LTC, a video switcher, an SMPTE / MTC generator box.
• You want Aria captures to align with LTC-stamped footage or audio in post-production; tens of microseconds of offset is achievable.
• You want to run multi-glass sessions where the timing master is external hardware rather than one of the glasses.

What it is

• STM32-based, open-source firmware and hardware, built on the STEVAL-FKI868V2 kit (NUCLEO-L053R8 host board + X-NUCLEO-S2915A1 sub-GHz daughterboard).
• Regulatory channels match the Aria glasses' supported set: ETSI 0–2 (865.6–867.2 MHz) and FCC 10–40 (903.4–927.4 MHz).
• Fully documented: 3D-printable enclosure, wiring diagram, hardware build guide, and CLI reference in the source repo.

Get started

The complete hardware BOM, build guide, flashing instructions, and CLI reference live in the source repo:

github.com/facebookresearch/projectaria_timecode_bridge

Follow the repo's README.md and hw/README.md for step-by-step assembly and firmware flashing, then configure the glasses as a Receiver on the same channel and broadcaster ID.