For a word clock, it’s ... The 8×8 limitation was initially set because he wanted to use a low-cost MAX7219 8×8 LED matrix module ... Both use an ESP-01 and an Arduino to help drive ...

If you’re dealing with RF, you’ll probably have the need to generate a variety of clock signals. Fortunately, [Jason] has applied his knowledge to build a SI5351 library for the Arduino… ...

The idea here is to use a cheap clock from IKEA, wire in a bunch of LEDs, connect and Arduino, and then use the 1Sheeld to trigger color changes depending on the traffic time between two points.

Build Your Own Arduino-Based Laser Clock with a Salad Bowl, Laser Pointers, and Some Spare Time. Alan Henry. March 5, 2012 It's definitely not ...

Such as the Arduino Nixie tube clock shield that is compatible with Arduino Uno, Micro, Nano microcontrollers but apparently works best with the new Arduino Nano 33 IoT development board.