This war-dialing safe-cracker opens combination safes

Mark Frauenfelder 10:44 am Mon Aug 5, 2019

The war-dialing safe-opener takes a maximum of 8 hours to open a safe.

It looks like something that could be pretty easily built with an Arduino and a stepper motor, but how does it know when is has arrived at5 the right combination? Maybe it feels a change in the torque on the dial, or senses a certain kind of click?

Image: YouTube

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