One of the most important processes for a successful simulation is the proper design of the drawing that is to be simulated. SENSE has automated a lot of the actions that are traditionally done manually and incorporated healing algorithms to successfully solve any touch sensor design.

However, there are a few good practices that still need to be maintained and a few rules that need to be followed for the user to seamlessly receive the simulation results.

SENSE Design Rules

Valid .dxf lines

In order for a sensor design to be seamlessly imported into SENSE , the .dxf drawing should follow specific rules. Those rules can be summarized in the following:

  • The design should consist of Polylines, LWPolylines, and Circles
  • Any other design option for lines (Regions, Splines, Individual Arcs) will not be properly imported

The final layout of the design should consist of the minimum required Polylines, LWPolylines and Circles needed to shape the surface area of the sensor components, whilst avoiding unnecessary loops. In other words, the only parts that need to drawn are the outlines of the sensor components.

Below are a few examples of good or bad practices and things that need to be avoided:

  1. Every component can be drawn by more than one line
  2. Single line showing the laser path should be avoided or using wide lines to represent a trace

Good Practice:

Bad Practice:

Good Practice:

Bad Practice (will not import):

Bad Practice (will not import):

Valid .dxf designs

Separate layers
The way you design in CAD tools is by placing the different design parts in separate layers. You usually do it for visualization purposes, however, this is the perfect way to design a sensor and import it in SENSE.
This is how a touch sensor design looks when placed in different layers

SENSE recognizes the different layers and enables the user to map them according to their preference. 

This means that the receiver and transmitter Electrode layers should be assigned as Electrodes in SENSE and the rest of the layers should be carefully placed in the same manner.
SENSE allows Insulators, Bridges and Vias layers, in order to capture designs that are defined in more than one Z dimension (co-planar touchscreens and PCB sensors to name a few).

: Correct units
SENSE allows the user to choose the units of their design. Since designing in CAD tools is usually a unit-less process, the choice is made once the design is imported in SENSE. It is important to choose the correct units, otherwise a design will be scaled up or down leading to problematic visualization and unrealistic results.

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