A few more revisions until I'm away from Eagle for a few weeks. I've updated the schematic, fixed a few major issues, and added an audio amplifier. Yes, it's a fantastically stupid idea, but I can see the value in having an optional 2 Watt class D audio amp on this board.

With that addition, I've run out of room on the board. Therefore, it's time for the BOM.

capacitors and resistors aren't free, but they're free enough. I did the math for 1k units on this, just to demonstrate how fantastically stupid manufacturing this would be.

In 1k quantities, the BOM for this board is $9.16. With the resistors and caps and board, it's going to be $10. If this were a product, it would sell for $20-25 without the Raspberry Pi Zero, or just a tiny bit less than a proper Raspberry Pi.

Nevertheless, there's a value in making stuff small, so I'll be making a few of these for personal projects. The github for this project has the updated schematic.

The next task, before sending this out for a real fabrication, is a refactor of the entire project. Looking over the BOM, there are some fantastically stupid choices here.

Here's a digikey cart