In a multiplexed arrangement, a single Arduino Nano is able to drive up to 12 seven segment displays, but only 9 needed to be driven for the program, keeping D13’s built in LED and the serial ...

This time [jegatheesan.soundarapandian] is making it big by building a giant 7 feet tall 7-segment display. Apparently, the plan is to build a giant clock so he started off by making the first digit.