[PD] Reading multiplexed data from an Arduino

[Alexandros Drymonitis]

I'm trying to use two multiplexers, one with 16 potentiometers and the
other with 16 buttons, to read the data in Pd. The potentiometers work
fine, but I get nothing from the buttons. Wiring look correct (I've tried
it with a single button and it works), so I've no idea what goes wrong.
I've attached the Arduino sketch and the Pd patch if anyone's willing to
give it a look.

Thanks
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