However, his latest video uses some a MAX7219 to create a 600 character scrolling LED sign. You can see a video of the thing, below. Spoiler alert: not all characters are visible at once.

When you read “Arduino wristwatch”, you fall into the trap of envisioning an Arduino UNO clumsily strapped to someone’s wrist. [Marijo Blažević’s] creation is much more ...

However, since the E Ink display has a low refresh rate, developer Ashtf has devised an interesting solution. He has a smaller OLED display on which anything you type shows up instantly.