@blinry @piko
You use bytes to store alphanumeric data ?

Because I made a QR Code watchface for the Watchy (github.com/Cqoicebordel/Watchf), and I guarantee trying to decode alphanum data on paper or in your head is hard, each char use 5½ bits.
Guaranteed headache.

All that to say, it would have been funnier to use alphanumeric encoding ;)