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Proceedings Paper

Electronic Mimosa
Author(s): Sanjay Gupta; Meera S. Datta; Vivek Rana; Shailesh Grover
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Paper Abstract

This paper describes the design of a low-cost, 2D, electromagnetic tracking device for personal computers. This interface makes use of the well-known principle of electromagnetic induction to locate the position of a transmitter in an x-y plane. This device has a ring which is worn by the user on the index finger. The computer monitor is overlaid with a transparent screen equipped with tuned electromagnetic sensors. These sensors pick up the signals transmitted by the transmitter coil on the finger. The receiver circuit extracts the envelope of the received signal and digitizes it. These digitized values of x and y axis signals are read by the computer through the standard parallel port. The system software running on the computer calculates the x and y co-ordinates of the transmitter coil and displays a cursor at that location. The transmitter also has a button which can be used like a mouse button. This keypress information is also transmitted by the electromagnetic means. The device driver for this tracker replaces the standard mouse driver. Hence most applications which use a mouse can also use this tracker. Its name `Mimosa' indicates that the user need not touch the screen (Mimosa Pudica is the Latin name of a plant whose leaves wilt when touched). Presently work is on to achieve uniform sensitivity over the entire screen and reducing transmitter power consumption. In order to demonstrate its working, a small, 3D game was written. The player has to reach a pre-defined location after traversing through a maze. The paper describes the interface electronics, system software, mechanical design and the sample application.

Paper Details

Date Published: 10 April 1996
PDF: 6 pages
Proc. SPIE 2653, Stereoscopic Displays and Virtual Reality Systems III, (10 April 1996); doi: 10.1117/12.237442
Show Author Affiliations
Sanjay Gupta, National Institute of Information Technology Ltd. (India)
Meera S. Datta, National Institute of Information Technology Ltd. (India)
Vivek Rana, National Institute of Information Technology Ltd. (India)
Shailesh Grover, National Institute of Information Technology Ltd. (India)


Published in SPIE Proceedings Vol. 2653:
Stereoscopic Displays and Virtual Reality Systems III
Mark T. Bolas; Mark T. Bolas; Scott S. Fisher; Scott S. Fisher; John O. Merritt, Editor(s)

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