“The snow flake project is a winter decoration consisting of a number of snow flake boards connected to one single string of wire. Each snow flake contains an own micro controller and 19 bright and beautiful white LEDs.
Using very small and bright LEDs creates a unique and beautiful effect, like the sunlight sparkling in snow crystals.
At the start, the individual snow flakes will communicate with each other and determine the own location in the strand. Next they display light patterns, which are synchronised between all boards.
Technically, the design is dead simple. The MCU is driving each LED individually with one GPIO. Each board has an input and output line for the bidirectional communication between the boards.”