What do you do with 144 7-segment displays ... This presented a problem, as [Frugha] wanted to control the clock with a single Arduino Nano. Even charlieplexing won’t get you that many I ...

His clever solution is to use an Arduino Uno R4 and take advantage of the onboard DAC. To turn on a segment, he connects ... He’s played with masking LED matrix displays with SMD stencils ...