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LED 3D Printer Bed Leveling Tool
Musical Menorah (made With Arduino)
OK, I'll focus my feedback - the hardware is a very cool idea, it's just the firmware that may need a rethinking so it's not easily spilling any beans.I'd love to try and collect the needed hardware and try to play with that myself. it's a big sale day on Ali Express, so I'll start there :)
Sorry to say, this is not secure enough for me and I can't recommend it. as people suggested, if the stick is lost you have to quickly change 250 passwords...also, if you are at a computer you don't know, a keylogger trojan will see the cleartext password anyway. the only REAL solution is some sort of OTP (Like TOTP such as Google Authenticator) or the new U2F standard (look up "u2f key" on your favorite search engine, Yubico seems to be a pack leader in features and design but there are a few others).However it's a cute gadget and I'd love to study the code behind it, I just can't recommend it as a real security measure. It's the equivalent of keeping a little notebook of cleartext passwords on your keychain, with all the physical OpSec risks involved.
Rubber Band Powered Bench Dogs