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A Differentiated HMI Solution using Capacitive Touch Sensing Technology

imageCapacitive sensing is a popular interfacing alternative to switches and knobs in consumer electronics, industrial and automotive front panel applications. IoT devices span across consumer, industrial, and business applications. All these applications can benefit from a sleek user interface, with product-differentiating features such as a touch display, buttons/sliders, proximity sensing, and intelligent touch switches for smart homes. For the best user experience, touch displays may also need to be able to support gesture recognition, water resistance, wrist detection, and gloved touch. Each of these features can be implemented using capacitive sensing technology in a manner that enables intuitive ways for users to interact with the product. 

Touch
Figure 1: Touch enabled Home Appliance (Example) 

CapSense Basics

CapSense (www.cypress.com\capsense) is an Infineon’s capacitive touch sensing technology. It works by measuring changes in the capacitance between a plate (the sensor) and its environment to detect the presence of a finger on or near a touch surface. A typical capacitive sensor consists of a copper pad of proper dimensions on the surface of a PCB, where a nonconductive overlay serves as the touch surface for the button. There are two types of sensing methods commonly used in capacitive touch sensing applications.


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