Techniques for robust touch sensing design

Here’s an app note from Microchip describing the best design practices when developing capacitive touch applications in noisy environments:

This application note will begin by defining the problems caused by noise, and explain how that noise typically affects systems. Hardware guidelines will then be provided to help maximize the natural signal-to-noise ratio (SNR) of the application. Software techniques are then covered to describe some of the common methods used to filter a sensor’s signal to increase the SNR further, and then to make a decoding decision based on the behavior of the capacitive sensor.

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