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Tip-Tap: Battery-Free RFID Computer Input By Touching Fingertips in Different Ways

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Computer scientists at the University of Waterloo have created a device for wearable computer input suitable for many situations, just by touching your fingertips together in different ways.

The device, called Tip-Tap, is inexpensive and battery-free through the use of radio frequency identification (RFID) tags to sense when fingertips touch. The device could, therefore, be added to disposable surgical gloves, allowing surgeons to access preoperative planning diagrams in an operating room.

Tip-Tap technology attached to a person’s hand.

“One of the many possible applications of the device is in surgeries. What typically happens now with operation digital preplanning is that an assistant is responsible for navigating the computer and communicating with the surgeon, but this is slow and difficult”, said Daniel Vogel, a professor in Waterloo’s David R. Cheriton School of Computer Science. “If the surgeon tries to navigate it themselves using a touchscreen or a mouse, it’s problematic because it would require constant sterilization, and current alternatives such as big gestures tracked by computer vision can get very tiring.

“The idea is if you mount Tip-Tap in surgical gloves, surgeons could navigate the computer themselves from where they are, and it won’t affect their other actions like picking up the scalpel.”

Video that explains how Tip-Tap works.

Credit: Daniel Vogel

Researchers created the prototype of Tip-Tap as part of a new partnership with the National Research Council of Canada (NRC).

In developing the method, the researchers mapped the most comfortable areas on the index finger for people to touch with their thumb, and tested different designs for the input points, such as smooth, bumps, or magnets. Following user tests with an early “wired” prototype to benchmark performance, they tackled the problem of making it “battery-free.”

The researchers were able to make Tip-Tap battery-free by splitting the antenna of an RFID tag in two, and equipping each side with three chips to enable two-dimensions of fingertip input, the first time this had ever been done.

The new RFID tag can be integrated into a glove or attached directly on the skin as a temporary tattoo.

“We used this design in two prototype Tip-Tap devices, a glove with a range of four meters, and an on-skin tattoo,” said Vogel. “Such devices are useful for issuing simple commands when a user cannot easily hold an input device, and the usage context is a defined area — for example, factory workers, surgeons, or people exercising in a gym.

“This is the only device of its kind that we’re aware of that doesn’t require a battery or cumbersome wires to make it work.”

The study, Tip-Tap: Battery-free Discrete 2D Fingertip Input, was authored by Waterloo’s Faculty of Mathematics researchers Vogel, Omid Abari, Ju Wang, Ziyang Shan, Ningshan Ouyang and Keiko Katsuragawa, who is also a research officer at the NRC. The study was recently presented at the ACM Symposium on User Interface Software and Technology (UIST), the premier forum for innovations in human-computer interfaces.

Contacts and sources:
Matthew Grant
University of Waterloo



Source: http://www.ineffableisland.com/2019/12/tip-tap-battery-free-rfid-computer.html
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