You can buy all kinds of conventional clocks that have hands and numbers for easy reading. Or, like [Fabio Ricci], you could build yourself something a little more esoteric, like this neat shadow ...
Secure microcontroller bootloader based on 32-bit ARM architecture built for the MIT BWSI Embedded Security and Hardware Hacking course led by MITRE - RooRoo6080/secure-bootloader ...
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