Cheap bluetooth tracker

well... Sort-of tracker. More like a lost keys reminder.

But it is cheap.
Since a surprising number of people wanted to see inside this thing, let's do that.

Here's where I got it from: https://pileofstuff.ca/r/x4n5c

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This isn't the only way to do it.
It's probably not the best way to do it.
But it's how I did it.