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Capacitive sensing based light control user interfaces

The focus of this article is the design of an efficient user interface for a light control application. With the number of competing light control systems on the market, the user interface is often the major difference between systems and determines the success or failure of a consumer product. The idea is to elevate user controls from bulky designs with a bunch of selection keys and area-occupying potentiometers to sleeker designs with smart capacitive touch sensitive button/slider controls. Using capacitive also makes the system more robust, jitter-free, and cost-effective. Moreover, the ability of capacitive sensors to detect objects at programmed proximities introduces a completely new dimension to the interface. Key topics to be covered in this article include, capacitive sensing techniques, user interfaces, radial sliders, backlight LEDs, and proximity sensing.

• 250.19 KB
• Sep 24, 2011