This chip-per-LED design allows the NeoPixel to reduce the bulk of heavy wiring, ... connecting a 300-500 OHM resistor between the data pin of the Arduino and the data line on the Neopixel.

Seriously, it looks like a movie prop from a summer blockbuster where [Bruce Willis] is trying to decide what wire to cut. [Jon] used a mega 2560 because he wanted to do the I/O directly from the ...

Code is written in Arduino’s wiring language using Adafruit’s Neopixel library. Building the clock with a single Printed Circuit Board (PCB) would be both expensive and wasteful.