Edward J. Wang
Shwetak N. Patel
ABSTRACT
We present CASPER, a charging solution to enable a future of wearable devices that are much more distributed on the body. Instead of having to charge every device we want to adorn our bodies with, may it be distributed health sensors or digital jewelry, we can instead augment everyday objects such as beds, seats, and frequently worn clothing to provide convenient charging base stations that will charge devices on our body serendipitously as we go about our day. Our system works by treating the human body as a conductor and capacitively charging devices worn on the body whenever a well coupled electrical path is created during natural use of everyday objects. In this paper, we performed an extensive parameter characterization for through-body power transfer and based on our empirical findings, we present a design trade-off visualization to aid designers looking to integrate our system. Furthermore, we demonstrate how we utilized this design process in the development of our own smart bandage device and a LED adorned temporary tattoo that charges at hundreds of micro-watts using our system.
Supplemental Material
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Supplemental material.
- Samuel DeBruin, Bradford Campbell, and Prabal Dutta. 2013. Monjolo: An Energy-harvesting Energy Meter Architecture. Proceedings of the 11th ACM Conference on Embedded Networked Sensor Systems (2013), 18:1---18:14. DOI:http://dx.doi.org/cpb2 Google Scholar
Digital Library
- Christine Dierk, Tomas Vega Galvez, and Eric Paulos. 2017. AlterNail: Ambient, Batteryless, Stateful, Dynamic Displays at your Fingertips. In CHI '17. 6754--6759. DOI:http://dx.doi.org/cpb3 Google ScholarDigital Library
- Tobias Grosse-puppendahl, Christian Holz, Gabe Cohn, Raphael Wimmer, Oskar Bechtold, Steve Hodges, Matthew S Reynolds, and Joshua R Smith. 2017. Finding Common Ground : A Survey of Capacitive Sensing in Human-Computer Interaction. (2017). DOI: http://dx.doi.org/cpb4 Google ScholarDigital Library
- Rangarajan Jegadeesan, Kush Agarwal, Yong-Xin Guo, Shih-Cheng Yen, and Nitish V. Thakor. 2017. Wireless Power Delivery to Flexible Subcutaneous Implants Using Capacitive Coupling. IEEE Transactions on Microwave Theory and Techniques 65, 1 (2017), 280--292. DOI: http://dx.doi.org/f9txphGoogle ScholarCross Ref
- Hsin-Liu (Cindy) Kao, Artem Dementyev, Joseph A. Paradiso, and Chris Schmandt. 2015. NailO: Fingernails as an Input Surface. Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems - CHI '15 (2015), 3015--3018. DOI: http://dx.doi.org/cpb9 Google ScholarDigital Library
- Hsin-Liu (Cindy) Kao, Christian Holz, Asta Roseway, Andres Calvo, and Chris Schmandt. 2016. DuoSkin: Rapidly Prototyping On-Skin User Interfaces Using Skin-Friendly Materials. In Proceedings of the 2016 ACM International Symposium on Wearable Computers - ISWC '16. 16--23. DOI:http://dx.doi.org/cpcb Google ScholarDigital Library
- International Commission on Non-Ionizing Radiation Protection. 2010. ICNIRP Guidelines for limiting exposure to time-varying electric and magnetic fields (1 Hz TO 100 kHz). Health Physics 99, 6 (2010), 818--836.Google ScholarCross Ref
- Ivan Poupyrev, Nan-Wei Gong, Shiho Fukuhara, Mustafa Emre Karagozler, Carsten Schwesig, and Karen E. Robinson. 2016. Project Jacquard. Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems - CHI '16 (2016), 4216--4227. DOI: http://dx.doi.org/cpcf Google ScholarDigital Library
- Alanson Sample, Daniel Yeager, Pauline Powledge, and Joshua Smith. 2007. Design of a passively-powered, programmable sensing platform for UHF RFID systems. 2007 IEEE International Conference on RFID, IEEE RFID 2007 (2007), 149--156. DOI: http://dx.doi.org/d9vc85Google ScholarCross Ref
- Tomohito Takahashi and Katushi Iwashita. 2010. Detailed high frequency transmission characteristics of Human body for Body Area Network. TENCON 2010 - 2010 IEEE Region 10 Conference (2010), 2040--2044.Google ScholarCross Ref
- Katia Vega and Hugo Fuks. 2014. Beauty Technology: Body Surface Computing. Computer 47, 4 (2014), 71--75. DOI: http://dx.doi.org/cpch Google ScholarDigital Library
- Martin Weigel, Tong Lu, Gilles Bailly, Antti Oulasvirta, Carmel Majidi, and Jürgen Steimle. 2015. iSkin. Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems - CHI '15 (2015), 2991--3000. DOI:http://dx.doi.org/cpcj Google ScholarDigital Library
- Thomas Guthrie Zimmerman. 1995. Personal area networks (PAN): Near-field intra-body communication. Ph.D. Dissertation. Massachusetts Institute of Technology. DOI:http://dx.doi.org/djcnczGoogle Scholar
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