An in-browser layout editor for LED animations, including the ones used on Schneeflocke, LED Cube3, LED 6×5, and LED Coffee Table. Pick a layout - or pick "Circle (Custom)", "Hex (Custom)", or "Matrix (Custom)" to build any size of those shapes on the spot - click an LED to toggle it (and its mirror partner, if it has one - uncheck Symmetry, or right-click, to toggle just the one LED), step through frames, Generate to export the animation as bitmap rows, and Export Layout to grab the layout itself as JSON (the only way to keep a custom size, since those aren't saved anywhere on their own). Source is in the larsi-org/LED_Editor GitHub repository's p5js/ folder.

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ProjectLayoutLEDs
Schneeflocke (Hex10)hex10271
LED Cube3cube327
LED 6×5 Shieldled_6x530
LED Coffee Tableled_7x749
ATtinyX5 - hex3hex319
ATtinyX5 - led5led_5x15
ATtinyX5 - led20led_20x120
LED_5 Moduleled_5x15
LED_8led_8x18
Peggy 2LEled_25x25625