PERCs: Persistently Trackable Tangibles on Capacitive Multi-Touch Displays
summary
Introduces PERCs: small tangibles with a field sensor that senses a touchscreen’s scanning signal plus a Bluetooth ID to report on/off the surface, and an optional light sensor for orientation. Prototypes are ~4x4 cm, run ~5 days on battery, and register with ~98% detection rate across 70,000 trials on three unmodified devices; average position error 1.5 mm and initial detection ≈50 ms (160 ms when using the light sensor).
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chapters (9)
- 0:00Introduction to tangibles
- 0:41How capacitive screens work
- 1:45Addressing adaptive filtering
- 3:39Active tangible communication
- 4:44Resolving orientation
- 6:32Internal hardware design
- 7:12Performance and testing
- 10:08Future research directions
- 10:51Conclusion and Q&A
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