I've gone from my first prototype to a custom PCB connector board. This is a NiceTOTP device.
It's a standalone TOTP device. After the initial setup, no phone nor computer is required.
It doesn't do passwords, just TOTP. A code is entered with the two buttons to unlock it, then you can flip through your accounts.
If you wanted to build just one unit, it'd be about $60 USD in parts ($50 w/o a battery).
Links:
https://github.com/ICantMakeTh…



ICantMakeThings
NiceTOTP
Full offline (except configuration) TOTP Hardware key, using the nRF52840.

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