What do you do with 144 7-segment displays? If you’re [Frugha] you ... as [Frugha] wanted to control the clock with a single Arduino Nano. Even charlieplexing won’t get you that many I/O ...

By combining 49 of them he’s put together a soda bicarb diode steering circuit for a 7-segment display capable of showing ... an aluminum oxide layer that forms on the aluminum when the correct ...