Summary:
Abracadabra is a magnetically driven input technique which allows wireless, unpowered finger input for any mobile device that has a very small screen. The advantage of this is that it is a very powerful, yet inexpensive way to interact with the mobile device. This technology uses multi-axis magnetometers to figure out the orientation of the finger in relation to Earth's magnetic field. The major disadvantage of this technique is that the user has to interact with an additional object. One of the advantages is that it is possible to mount the sensor which pics up the magnets location (on the finger) behind the display which means that there is no loss in functionality on the screen. The second major advantage is that the sensor can be placed in the center of the object because it is on the back of the screen. This technique has been tested with small handheld, or wrist size devices and a magnet worn on the finger which overrides the Earth's magnetic field for a small area.
Discussion:
I believe that this is another very important area of research because todays technology is continually getting smaller and smaller which makes the interaction with these devices harder and harder. I believe that one of the problems with this technology is that it requires another thing for the user to use and gives the user something else that they could lose which would make the mobile device unusable. I belive that the next step for this technology would be to figure out a way for the device to monitor finger movements without the need for an external device (finger ring).
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