I decided to create the simplest pair of wired-connected Attiny45 via async serial interface.

Network consists of two board: “bridge”, which will be connected to laptop and “node” which will just receive signals.

First of all, I redraw board in Eagle

Okay, let’s start to make it:

Then, upload sketch http://academy.cba.mit.edu/classes/networking_communications/bus/hello.bus.45.c

Files:

  Bridge Eagle schematic file
  Node Eagle schematic file

  Bridge Eagle board file
  Bridge Eagle board file

  Bridge traces export
  Node traces export

  Bridge traces export
  Node solder mask

  Bridge traces G-code
  Node traces G-code

  Program