opentag U1 documentation

Measure distance between two tags, or set up anchors for indoor location.

Start here

Distance quickstartTwo tags. Flash the roles, connect USB, and get your first measurement. Location quickstartThree anchors for 2D or four for 3D, plus one mobile tag. Python toolsDownload the scripts to read distance and save CSVs outside the browser. ROS 2 integrationPackage requirements, setup, topics, and connection checks.

Choose the right interface

Task	Use	Know before starting
Distance	Browser or USB serial	The responder reports the measurement; the initiator also needs power.
Location	Browser or USB serial	Survey the anchors before configuring firmware.
Calibration	Browser; Python for distance	Runtime calibration is lost on reset unless restored or included in the flashed image.
ROS 2	USB serial	Download the driver source and build it in a ROS 2 Jazzy workspace.
Range over CAN	Bench-test image	CAN-enabled responder, 500 kbit/s, with concurrent USB output. Physical-bus validation pending.

Use it without the browser

Start with the Python tools download and installation. Only one application can own a tag's serial port at a time: disconnect it in the console before opening Python or ROS 2.

Reference

Hardware and wiring · USB serial protocol · Distance calibration · Performance and limitations

Building firmware and running the CAN examples require access to the current source checkout. They are not prerequisites for the browser quickstarts.

First measurementDistance quickstart →