kicad-laser-min

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kicad-laser-min

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laser cnc minimal gcode generator

kicad-laser-min 최신버젼 다운로드

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// repository documentation

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## kicad-laser-min

The application will take a PCB file generated by KICAD and create paths isolating all nets.
This is isolation routing for PCBs.

### Operation
The application uses a line Voronoi segmentation technique on the BW image of one layer of PCB. The Voronoi algorithm has been implemented in C++
by colorizing each track a different color. Each track is dilated until regions meet. Finally, an edge detection algorithm will produce the contours.
The contours produce the PCB region isolation. A contour following algorithm will transform the edge into gcode.

Double separation creates increase isolation between PCB tracks  (0.5mm per contour) .

The KICAD pcb to image conversion uses `<pxmm>` scale (which defaults to 30 pixels per mm).

Edge dilation takes time (why it is implemented in C++). The time is dependant on the `<pxmm>` scale.

Drill holes for pads and vias will be added to the end gcode. The holes drawn will be original size.

<img src="images/output.png">
From left to right - BW Image of tracks, Colourized Dilation of tracks, Edge Detection of dilation.

## Note
The application is provided as is. I tested it with my own generated pcbs and worked well. However, your testing is also appreciated.
Please review outputs, especially gcode (as I am not an expert on any of the file formats used).

```KICAD Version used :
    Application: Pcbnew
    Version: 5.1.6-c6e7f7d~86~ubuntu18.04.1, release build
```

### Usage

```Usage:
Option: -m         Process map.png directly
        -f         Process Front Copper Layer.
        -b         Process Bottom and Front Copper Layer.
        -c         Do not cleanup after processing.
        -p<pxmm>   Change pixels per mm (default 30)
        -v        Don't Double Mark Vias
        -x        Mark Pads and Vias with '+'
        -d        Increase Separation between Isolated Zones
        -t       Increase Separation between Isolated Zones but include middle-trace
        -r       Override feedrate (default 120)

```

### Files
kicadpcb2contour.cpp

### Output Files
    map.png       - BW output image of Kicad PCB conversion
    cpp_image.png - your mind on LSD. The colorised image dilation of PCB tracks.
    trace.png     - Edge detection of the dilated image
    front.gcode   - Final gcode for Front Layer
    bottom.gcode  - Final gcode for Bottom Layer
    mask.png      - Mask of PCB to handle Edge cuts

### Dependencies
OpenCV libraries (version 4.5 used) with opencv_contrib (ximgproc)

### Compilation
Go into the directory and type in ```make```.

### Solved
Some offshoot tracks where created, output from opencv finContours. Contours outside the board are pruned out.

### Errors

However, as shown the inter-contour distance tolerance is of 0.0685mm. I have a laser cutter with an engraving width of 0.2mm (i.e. a
possible 0.1mm engraving width on the centre of track to a track coninciding from left or right side)

Contours do not touch.
<img src="images/error-1.png">

However, distance is small enough to still function.
<img src="images/error-2.png">

OpenCV follow contours creates two contours from both sides.
One could propose new findcontour method. No real problem here, rather than double time to process pcb.
<img src="images/error-3.png">

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