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Designing a Four-by-Four Keypad Arbitrary-Key-Entry Detector

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Abstract:

This paper presents a field programmable gate array (FPGA) prototype of a four-by-four keypad arbitrary-key-entry detector design for entering any arbitrary set of the 4x4 keypad keys. The number of the valid keys was defined by a multiple-bit mask input. The character code of the prohibited key would not be generated after a key stroke. A valid-key stroke caused the detector circuit to generate a 4-bit hexadecimal character code and a sampling tick for the next-stage device to capture the pressed key information. The detector design and the testing circuitry were implemented on an Atlys Spartan-6 FPGA Development Board. The design itself can be incorporated into a wide variety of key-entry tools on electronic instruments, mechanical devices, medical apparatus, and more, to improve the key-stroke filtering and ease the interface connection.

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Periodical:

Applied Mechanics and Materials (Volumes 433-435)

Pages:

887-894

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.433-435.887

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Cite this paper

Online since:

October 2013

Authors:

Wan Fu Huang*

Keywords:

4x4 Keypad, FPGA, Verilog

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Сopyright:

© 2013 Trans Tech Publications Ltd. All Rights Reserved

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References

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