USB-C
One cable powers the tag and streams distances and timestamps as plain serial. Plot live in the browser console or parse from any language.
opentag one
Performance
±10 cmranging accuracy
±20 cm3D position accuracy
50 Hzupdate rate
60 mline-of-sight range
Typical figures, measured line of sight. Expect 15–25 m through walls; one 4-anchor cell covers a room up to a warehouse bay.
How it works
Getting data out
CAN FD
Wire tags straight into your robot's bus. Power and data over one harness, 6–24V in.
ROS 2
Driver on the roadmap. The serial protocol is simple to wrap in a node today; follow along on GitHub.
In the box
Assembled Tags
2 or 5 opentag one units in PETG enclosures with clear lids, built and tested in San Diego.
Firmware Loaded
Every tag ships flashed and ready to range. Update any time from the browser console.
Open Files
Mechanical CAD (STEP) downloads below, firmware source on GitHub.
Tech specs
- Radio
- DWM3000 UWB
- MCU
- STM32-M4 · 170 MHz · 256K flash · 128K RAM
- Programming
- SWD · USB-C via web console
- Power
- USB-C or 6–24V in · reverse-polarity protected
- I/O
- USB-C, CAN, CAN FD
- Firmware
- Embassy (Rust)
- Enclosure
- PETG case · acrylic lid
CAD files
Applications
Robot Navigation
A position estimate indoors, where GPS won't reach.
Drones
Indoor flight without a $10k mocap rig.
Docking & Follow-Me
Live distance between two moving machines.
Anchor Nets
Build, debug, and time UWB anchor layouts.
Asset Tracking
Prototype a deployment before a custom design.
Field Testing
Antennas, placement, calibration drift.
FAQ
How accurate is it?
Typically ±10 cm for two-tag ranging and ±20 cm for 3D TDOA positioning, line of sight. Walls, metal, and people degrade this — UWB handles multipath far better than Bluetooth or Wi-Fi, but it isn't magic.
How do I get position into my robot?
Over USB-C as a serial stream, or over CAN / CAN FD on the same harness that powers the tag. A ROS 2 driver is on the roadmap.
What do I need for TDOA?
Use multiple tags as anchors plus one mobile tag. The 5-tag kit is the intended starting point: four anchors covering the space, one tag on the robot.
Can I flash it from the browser?
Yes. The firmware page supports flashing and ranging workflows through browser tooling.
Is the design open?
Mostly. The mechanical CAD files are available, along with the firmware. Schematic / PCB files are not available currently.
Shipping, returns, and warranty?
Kits ship in about 1 week from San Diego, CA. Unused kits can be returned within 30 days of delivery for a refund. Manufacturing defects are covered by a 1-year limited warranty — email hello@open-tags.com and we'll make it right.
Is it FCC certified?
opentag one is sold as a development kit for evaluation by qualified engineers; it is not authorized as a finished consumer product. If you integrate it into a product, end-product certification is your responsibility.