In the end I just moved out my outline, set my tool diameter to 0.01, and machine twice on the line instead of outside of it. png (which resulted in no toolpath at all), playing with the image processing etc. I tried a number of things, like getting rid of the mounting hole, inverting my.
I ran into one problem as shown in the screenshot below, where mods insisted on cutting both sides of my cutout. I then checked my board for continuity as per the screenshot at the top (and learned that the continuity tester of a fluke packed enough voltage and current to inadvertently forward bias and light up an LED…
I soldered the 6 pin FTDI breakout pins by hand, and then did everything else with solder paste and hot air gun, which worked really nicely. Shown below is my cutout + soldering progression (I am so sorry for the wrong orientation in the first picture). In the end I broke everything out and had a few pins leftover. I added a button that pulls up pin 2, and a green LED that comes on when pin 3 is brought low + a current limiting resistor for each, a bypass cap, and a 4.7k ohm resistor for programming. The 6 pin FTDI breakout was a late addition after Anthony reminded me that we were designing an Echo board that needed to be able to be able to communicate over the serial peripheral using pins 4 (TX) and 5 (RX). You can see my schematic and footprint below. This gives us an astonishing 5 out of 8 pins to do stuff with. This seems to be the first year we are moving to microchip’s new line of refreshed Atmel era microcontrollers that use a single pin for programming and reset using UPDI, which is very cool. I designed the circuit below around the ATtiny412’s we have in our kit. I have some PCB design experience so conceptually this week wasn’t too bad. I started a schematic in Altium Designer which I have used a little bit at my last job, but considering as there isn’t a library for the class (and Altium is notoriously difficult to find libraries for + get png’s out of), I opted to not draw a bunch of schematics and footprints and caved for Eagle. For week 7 our task was to get comfortable with an ECAD tool, and design / mill / populate a PCB.
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