a 16×8 LED Matrix display driven by a TLC5920 LED driver, with an Arduino that uses a DS1307 RTC (real-time clock) with a coin cell battery to keep track of time when not powered through USB.

especially when the 6 o’clock LED is centered at some noticeable object or feature. A custom and home-etched PCB using an ATtiny4313 instead of an Arduino are the clock’s brains, a Maxim ...