Finexus: Tracking Precise Motions of Multiple Fingertips Using Magnetic Sensing
summary
A prototype mounts tiny electromagnets on fingertips and localizes them with four magnetometers sampling at 450 Hz, separating coils by frequency multiplexing. A solver converts bandpass-filtered field strengths to 3D positions across a 30 cm^3 volume, reporting 1.33 mm average error up to ~12 cm and error growth beyond that; processing takes about 2.07 ms per point. Hardware uses 300‑turn coils on ferrite, an external audio amp for driving, and 90,000 measurement samples for evaluation.
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chapters (8)
- 0:00Introduction to Finexus
- 1:30Project background and motivation
- 3:59How magnetic sensing works
- 7:49Challenges with ambient noise
- 10:18System prototype and demo
- 11:24Evaluation and accuracy results
- 13:16Future improvements
- 15:03Conclusion and Q&A
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