CHALLENGE & OUR PROPOSE SOLUTION
We propose Serpentine, a highly stretchable self-powered sensing interface empowered with signal processing to recognize the deformations in its shape. This interface is fabricated in a coil-like structure with multiple coaxial layers of silicone, copper and conductive nylon thread. Proposing its structural design and specific choice of materials allow mechanical deformations of the interface create time-varying charge distributions between the conductive nylon and copper thread that generate electric signals. Such signal generation happens based on triboelectric nanogenerator (TENG) phenomenon that works on the conjunction of electrostatic induction and triboelectrification . Since, the deformations and consequently, charge distributions lead to power generation, the working principle itself eliminates the need of external power to sense deformations caused by gestural interactions. Self-generated signals are then processed through an implemented system including signal processing pipeline that uniquely maps them to actions that created the deformations.Our proposing system enables us fulfill our vision to create an interface that is not only self powered but also sensitive to a wide range of expressive input modalities.
The cylindrical, cord-shape and highly stretchable form factor of Serpentine’s interface enables three way force application: towards the axis (radial), along the axis (longitudinal), and tangential to the cross section (tangential). These elementary modes of force application build interactions of touch, twist, tap, press, stretch, slide, and many more complex combinations. High sensitivity to low-frequency signals (e.g. less than 100 Hz) appropriates Serpentine as input technology for various computing devices including gestural sensing and recognition. The simplicity of the physical structure of the sensor, universal availability of tribo-materials (all materials available in our daily life like paper, fabric, PDFE, PDMS and many more) and DIY approach for its constructions allow such a sensing interface to be scaled for variety of applications. Serpentine eliminates the need of bulky or rigid sensing instruments worn on different parts of the body. It’s specific material properties, form-factor and physical structure allows gesture interaction naturally and unobtrusively. Our evaluations show that our sensing platform perform with 85 % accuracy in gesture classification and is consistent for different users.
HOW SYSTEM WORKS
Link to any repositories (e.g., Github)
Final Appearance of the Sensor