Reddit user Krukerfluk has created an awesome DIY digital clock using 144 x seven segment displays, combining them to create a larger LED display ... and versatile microcontroller board that ...

Vintage seven segment digits make up the display ... on pins on the microcontroller, [Spencer] connected all the middle coil pins together on a digit. Each coil can be powered using a single ...

We could easily have used a suitably complex microcontroller, but we decided to try using the ... a Charlieplexed display to arrange the LEDs in the required two-digit, seven-segment format ...