The assignment for this week is to produce the Hello World board, adding at least a button and an LED to the original design, using some of the proposed software
Design the board with eagle
I started to model the schematics in Eagle adding to the original schema a leds and a button.
This was the first time that I design a board circuit so as first step I downloaded the software from the official site and the libraries from a usefull collection.
The work on Eagle is divided on two part: the schematic design and the board design.
First of all create a new project, then create the first schematic.
Once you create the schematic you have to add all the components on the page by clicking the add icon.
A handy search window will allow us to select between the various components to create our data sheet providing the component and a preview of the symbol for the scheme and appearance of the component.
We found all the necessary components we just have to create links between them and assign the correct values to resistors and capacitors .
Finished creating the connections I immediately they realized how messy was the schematic thus, on the advice of my mentor I first of all cleared up giving the right names to the connections and then eliminated the overlapped connections.
Ended scheme are passed to the design of the board and to trace the tracks.
Placed the pieces inside the workspace I tried to automatically generate tracks with a very convincing result.
To create a usable card I had tracked automatically generated and look for the right way to connect all the components with each other
Milling the helloboard
As for the Fab Isp, to mill the Hello board I used a roldand mdx-40 and generated the Roland Mill file using the Fab Modules First of all we made a solid and uniform base using a 1mm milled SANMODUR blocking it on the workspace with double-side tape. For milling the traces I used a 0.12mm conic tip (bolino) with 40° angle inch bit, to remove all copper from the usb connector i used a 0,4mm tip, while for cutting out the board i used the 2mm tip.
here is the final result
