An Energy Harvesting Wearable Ring Platform for Gesture Input on Surfaces

B00902069 傅蕎

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Problem

• To interact with mobile devices on-the-go• Glasses, wrist band, watch not good• User have to practice• Environment limits• Too heavy processing, power hungry

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Related work

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Ring!!

• Wearable• Detect finger motion on

arbitrary surfaces• Transmit wirelessly• Identify 23 gestures• No explicit user training• Energy harvesting from

NFC-enabled phone• 10 hr 2Hz interaction

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Design

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Gestures

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Surface detection

• Arbitrary, un-instrumented surfaces• Pressured-based touch detection• Audio-based motion detection

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Surface detection - touch

• Pressured-based• When touch or curl,

stiffen and move laterally• Force sensing resistor

on inner wall of ring• Consume less power

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Surface detection - motion

• Audio-based• Friction between fingers and surfaces• Function of finger motion speed,

and properties of the surface• Noise• Use band-pass filter

• They use common office paper

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Gesture classification

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Energy harvesting

• 10mAh battery capacity• NFC-enabled phone• RFID is a type of NFC

• Coil loop around ring band• Maximize the size

• Position C best• Over 5% capacity is available

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Evaluation

• SVM• More data, more accurate

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Future work

• Wireless transmission no detect or recover frompacket loss or error• Improve classification accuracy• Improve noise resilience• Larger variety of surfaces• Lack of feedback• Larger amount of training data

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Question?

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Thanks!:D