Touch interfaces such as elevators buttons can potentially aid in the transmission of pathogens. Inspired by the COVID-19 pandemic, I decided to build a prototype of touchless keypad. By implementing Arduino Capsense Library, capacitive proximity sensors are made with aluminium foil and high value resistors. As this setup normally functions as a touch sensing device, several modifications are implemented to increase the sensor’s sensitivity for proximity sensing, which will be highlighted in this article.
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