Behind the clock is an Arduino driving a MAX7219 LED controller. Using the MAX7219 was a challenge because it expects a grid of LEDs while the clock needs a linear array.

Posted in clock hacks, Mac Hacks Tagged arduino, chronodot, DS3231, mac mini, MAX7219 ← Watch A Rocket Engine Test Live This Afternoon Signal Sniffing Some Laundry Pay Cards → ...

Learn how to control and blink multiple LEDs using the MAX7219 driver with Arduino. A simple guide for beginners in ...

The MAX7219 driver simplifies the process of controlling multiple LEDs in matrix or numeric display form. For fast prototyping, software code developed for the MAXREFDES99# reference design works with ...