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Initially PCBs were designed manually by creating a photomask on a clear mylar sheet, usually at two or four times the true size. Starting from the schematic diagram the component pin pads were laid out on the mylar and then traces were routed to connect the pads. If you have many questions of PCB Design, please come here!

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The Capacitive-Sensing Design by 8-bit MCUs Reply 2017-01-23 16:18:57
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Richard Baggaley

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Adding capacitive sensing to a consumer or industrial product can be a daunting challenge that requires developers to maintain sensor robustness and responsiveness while minimizing current consumption and addressing other system-level design priorities. Navigating this embedded development process without the help of tools and support can lead to lengthy trial-and-error design iterations, both in software and hardware, resulting in slipped release schedules and suboptimal solutions.
While fixed-function capacitive-sensing solutions can ease some of these design burdens, those devices are rarely pure drop-in solutions, as many still rely on developer-side configuration and calibration. In addition, fixed-function solutions prevent developers from giving the sensor additional responsibilities in a system, which can help reduce system current consumption, board size, and bill-of-materials (BOM) cost.
Capacitive-sensing solutions based on general-purpose 8-bit microcontrollers (MCUs) can help designers through each step of the development process, enabling them to generate projects using capacitive-sensing firmware libraries, add and debug features with an intuitive and powerful integrated development environment (IDE), and view real-time capacitive-sensing performance in-system using capacitive-sensing visualization tools.
Capacitive-Sensing Design Basics
Capacitive-sensing technologies measure the capacitance of an electrode connected to the sensor’s input. The electrode being measured is often a printed-circuit-board (PCB)-designed round pattern of solid copper about 10 mm in diameter that’s isolated from the board’s ground. A thin overlay, usually made of a type of plastic or glass, is sometimes adhered to the PCB, and the resulting system can function as a touch interface that doesn’t require mechanical buttons.
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Charles

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Nice posting! Your sharing is quite in-depth and solves my puzzles all the time. I will keep reading your post.
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