Guidelines are listed here for sensor routing, or how to bring the signal from the copper pad acting as the capacitance sensor to the input of the device. It is recommended, in general, to use a via to connect to the middle layer. Use short routing if possible and avoid having traces run parallel to each other to minimize capacitance. Any physical layout that may create unwanted capacitance should be avoided as much as possible. If that is not possible, then care should be taken to have a distance or a gap between them, as wide as possible. The empty spaces on top of wires should be filled with mesh ground as protection against noise, and the ground polygon clearance should be at least half a millimeter. It is always a good design practice to keep the sensor traces away from I2C lines or any other digital lines that might be sources of noise.