Common shapes are filled disks, squares and rectangles. In this example I will illustrate on how to make Capacitive Electrodes from a single PCB object or a combination of objects using Copper Fill.Īn electrode is simply the patch of conductive material on a substrate that forms the sensor. Part 1: Making Capacitive Electrodes from Copper Fill This change is detected by the measurement circuit and converted into a trigger signal. If a conductive object approaches or touches the electrode, the measured capacitance will increase. The capacitance of the sensor pad is measured periodically. the sensor electrode, is connected to a measurement circuit. The corresponding 2nd plate is represented by the environment of the sensor electrode (to form a parasitic capacitor C0) and another conductive object, like a human finger for example (to form touch capacitor CT). The electrode of a touch sensor represents one plate of such a capacitor. Capacitance sensors detect a change in capacitance when something or someone approaches or touches the sensor.
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