This book doesn't contains any physical buttons. There is accelerometer inside the book and it can recognize your gestures. It can be used in discrete way (to switch page or to switch menu position in both directions), or it can be used in analog way (e.g. to set brightness of the NeoPixel led)

There is a whole second category of managed switches though that people don't initially think of. These are the network switches that are inside consumer routers. These routers are little Linux devices that have a switch chip inside of them, one or more ports are internally connected to the CPU and the rest are on the outside as physical ports.

Ping-pong balls have many uses: apart from playing table tennis, they have been used for countless art projects, science experiments, and even to raise ships from the bottom of the ocean. As it turns out, they also come in handy as diffusers for LED pixels, allowing the construction of large-size displays without requiring large individual LEDs.

When you’re going to build something big, it’s often a good idea to start small and work out the bugs first. That’s what [bitluni] did with his massive 1200-pixel LED video wall, which he unveiled at Maker Faire Hanover recently.

Modular 3D Printed LED Ping Pong Ball Display

Create a large display from 3D printed modular components without circuit boards

This setup blew my already high expectations! I'm having so much fun with it. And the best part is, the camera is super affordable (I bought mine for just under $100, and it goes for $90-120 depending on color and condition). 12 megapixels is more than enough. And this DIY infrared mod is super easy to do! Don't worry, I'll show you how I did it so you can decide if you want to convert your camera to infrared as well.