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This one on "self organizing LEDs" was fun and motivating: https://news.ycombinator.com/item?id=23741036 https://news.ycombinator.com/item?id=23741036 Video:

• flywheel 6y ago
  Pretty simple to do this honestly, it's been done many times before. There are phone apps that do this that have been around for a while. After all it's just assigning an x/y value to a position that a color was detected at.