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Article: Microcontroller's single I/O-port line drives a bar-graph display.(design ideas)
- Article from:
- EDN Asia
- Article date:
- October 1, 2006
- Author:
CopyrightCOPYRIGHT 2006 Reed Business Information, Inc. (US). This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Instrument designs featuring a digital display may benefit from a secondary display that provides an analog version of the displayed parameter. A bar-graph display provides an easily interpreted graphical indicator that allows comparison with its full-scale value, but a conventional microcontroller-based design uses at least one eight-line I/O port to drive an eight-segment-bar-graph LED display.
As an alternative, some microcontrollers include a PWM (pulse-width-modulated) output. You can minimize the number of required I/O lines by using the PWM output to drive National Semiconductor's LM3914 bar-graph-display-driver circuit or an equivalent. In operation, the ...
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Article: Taiwanese Inventor Develops Liquid Crystal Display Shift ...
US Fed News Service, Including US State News;
August 5, 2008 ;
418 words
... ... Yu of Hsinchu, Taiwan, has developed a shift register circuit minimizing voltage overlap. According ... Patent & Trademark Office: "A shift register circuit includes a shift register unit and a buffer. The buffer is coupled ...
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