The purpose of this entry is to provide with a CAD design and the necessary steps to represent the 8×8 LEDs matrix of the robot.

Our design aim is to obtain a CAD design for the 8×8 LEDs matrix including the module with the max7219. This module will be placed at the robot’s face, so we need to create a square with the size of the LEDs matrix itself, which will be the visible part. The remainder of the electronics, will be at the rear part and glued to it. We will use the cutting layer of the square and the rest of elements will be drawn in the auxiliary layer.

Dimensions of the 8×8 LEDs matrix are as shown:

We will use the following template:

Select the Auxiliary layer and create a polyline with a “Y” shape (starting at the bottom side):

polyline

18.3,0

@0,-18.3

@9.75,0

@0,-16.7

@12.5,0

@0,16.7

@9.75,0

@0,18.3

Then, we will create another polyline with the “U” shape (inverted):

polyline

9.75,50

@0,5.4

@12.5,0

@0,-5.4

Finally, we will create another polyline with the square in the cutting layer:

polyline

0,18.3

@32,0

@0,32

@-32,0

@0,-32

We can annotate dimensions and text in the auxiliary layer as shown, using the corresponding tools.

Here you can find the DXF file with the solution: