Step 6Updated Design
Most notably is the addition of a low drop voltage regulator. Now the board can run with anything from 4 to 14V DC. I've also changed the PCB color to yellow and added jumpers to disable auto reset and to bypass the voltage regulator if it's not needed.
Demo code for grabs and assembly instructions. You'll find KiCAD files and a schematic there as well. In case you want one, you can find more info on my blog.
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