i began by downloading Eagle, and the fab library and adding it into the library. using eagle, and watching several tutorials especially this one, following along- starting and stopping as i worked.i also looked up different PCBs with LEDs on them... specifically to figure how to know how strong a resistor to put on there? how to put LEDs in a series a->c and know which way the current is coming?
workflow in Eagle: 1. open a new project, name it, context click for a blank schematic 2. add desired components into the schematic 3. draw wires to show electrical connections, as well as to vcc and gnd. 4. once everything is connected switch to board view, and lay out board as it will be milled 5. draw in traces 6.check design rules 7.change view to show top layer only 8. export as image.
in the process of using Eagle, i had to open the fab library under the library tab, find the components, and then type the description exactly when adding them to the schematic. the "search" box inside of the "add" function was less helpful for me finding what i was looking for.
once i switched to the board view, i realized that i had imported an ATTiny44 with the wrong package (thruholes instead of surface-mount) to fix this, i went back to the schematic added in the right package, deleted the previous one, and reconnected it. when i switched back to the board view, it showed the correct footprint. this was necessary beacuse changes must occur in the schematic and NOT the board. i exported the board as an image, and then changed the burgundy to white in photoshop.
click here for the Eagle sketch file
click here for the Eagle board file
click here for the traces file
click here for the interior file
so i milled out a board and the traces were too thin and some pads and traces blended together... no idea why that didn't work...
i looked up my problem and aha- my resolution was too low- i saw someone recommended exporting at 500 dpi, and i exported as 150 which was the default from eagle to png. i resaved with higher resolution, checked and applied the design rules, re-exported, and then tweaked the design a bit more by angling some of the turns, using a smaller grid in Eagle to make sure no traces were too close, and milled another pcb. also- to be sure, i change the offset from 4 to 5 in fabmodules giving everything an extra pass with the endmill.
i noticed there was one place (PA5 connecting to both MISO and SCK) where i used an x-acto knife to cut the connection. i checked all traces with the voltmeter, and proceeded to stuff the board.
finished board with added button and two LEDs with resistors.