Do It Yourself

First to guess what this is and what it was used for wins 5 $USDC !

Just found this small device I built 15y ago. If was stored in an meds tube.
Guess what it is and what it was used for and I send 5 $USDC on your Warpcast wallet.

Looks like I have to upgrade the challenge:
- delay the reveal to give more time because of new rules.
- introduce a new point notation system of 10 points.
- require at least 6 points to win.
- The winner is the one with the most points.
Read more 🧵1/4

And the decrypted answer (but you can verify):
This device is a USB to 5v switch. You plug it on a computer using the USB, then send the right command to the USB device, basically just a few bits, and it either open or close the circuit that allow 5v current to output from the white dual poles connector.

It was used to turn on or off a power plug controlled by 5v. If the plug was powered, it delivered 220v if not, it was of. This allowed me to control an external USB drive from a NAS to power the drive before backup, and turn it down after backup was done.