I am very interested into Internet button, it is connected to 11 LED but I think it doesn’t use 11 IO pins to control the LED individually, so I want to look into the Internet button to see how it make it to work.
They are neopixels, digital LEDS, requiring only one pin to drive. They each contain a chip (WS2812b), which will control the leds independently from the microcontroller once they’ve gotten the command. If you search for neopixels, you’ll find plenty of guides, especially on Adafruit.
And as to open source, yep! We’ll put up the eagle files and some other assets soon. @Moors7 is exactly right, too- just one digital pin, and that one’s I used is labeled on the silkscreen as “LED”