I woke up to a strange buzzing sound coming from my bathroom. It turns out that one of our toothbrushes started it’s own life and turned itself on and then off again after a while. So I did what any self-respecting hacker would do: I threw it out the window and let the battery run out, and went back to sleep.
The next morning I take the toothbrush and put it on my lab bench to be disassembled, hoping that it could be salvaged by cleaning it out or replacing an obvious part. After some examination, the following interaction happened:
Why would that need NFC???
The answer is a lot less nefarious than all of us expected, but let’s not get ahead of ourselves.