Tools used: Autodesk Eagle, Modela MDX-20, GIMP
The design is based on the file Neil provided.
The initial schematic design. I spent days to figure out the program, and this is not the most useful way to draw a schematic.
This is the ratsnest. I tried to autoroute it but that led to many errors.
For improved clarity, the new schematic separates the elements.
Before drawing the board, it is important to set the boundary conditions. In the ratsnest, go to Tools --> DRC --> and make sure to set all values in the Clearance tab on 16mil. On the Sizes tab, set the Minimum Width to 14mil. Lastly, go to the Supply tab and set Thermal Insulation to 16mil.
The result!
Import in Mods.
Check the path of the traces.
The outline of the bear turned out to be too large for the physical board, so I made a smaller outline. Settings: File --> export image. 1000 dpi. Monochrome
To remove the text for the png file: Go to top layer: Display 'Display none top' to remove the outlines Go to Dimension layer: 'display none dim' to remove the traces.
Import and settings in mods
Final result
Before the outlines could be milled, the board should be filled with white space. Otherwise the milling machine will trace the outlines twice.
Before I could start milling, the sacrificial layer and the broken mill-end had to be replaced.
Home settings: x=3 y=3 Traces: 4
1x ATtiny44
1x SMD button
1x 20MHz resonater
1x 6-pin FTDI header
1x 6-pin ISP header = SMD in reality
1x green SMD LED
2x 10k ohm resistor
1x 499 ohm resistor
1x 1uF capacitor
Sadly, I accidently soldered the microprocessor in the wrong direction.. Here are various attempts to desolder, unfortunately none of them led to success.
Desoldering troubleshooting
