We're learning how to use EAGLE by stepping through the design process for a basic Arduino-type AVR microcontroller development board, specifically the Really Bare Bones Board design by Paul Badger of Modern Device. In Part 1, we showed you how to lay out the schematic and validate it with EAGLE's built-in Electrical Rule Check. Here we'll show you how to establish the physical shape of the board and the actual copper pathways that make up the real circuit.
It’s loud, annoying, and fun — cut out the parts on a CNC router, then motorize them with a cheapo bench grinder (we found the perfect one at Harbor Freight). A great CNC project from MAKE fabricator Dan Spangler, designed with a traditional 5/6 two-tone sound ratio like the classic World War II sirens. WEEEEEEEEEEEOOOH!









