Previous chapters of this book show a variety of ways to interface BeagleBone Black to the physical world by using a breadboard and wiring to the
P9 headers. This is a great approach, because it’s easy to modify your circuit to debug it or try new things. At some point, though, you might want a more permanent solution, either because you need to move the Bone and you don’t want wires coming loose, or because you want to share your hardware with the masses.
You can easily expand the functionality of the Bone by adding a cape. A cape is simply a board—often a printed circuit board (PCB)--that connects to the
P9 headers and follows a few standard pin usages. You can stack up to four capes onto the Bone. Capes can range in size from Bone-sized (Using a 128-by-128-Pixel LCD Cape) to much larger than the Bone (Using a Seven-Inch LCD Cape).
This chapter shows how to attach a couple of capes, move your design to a protoboard, then to a PCB, and finally on to mass production.
You want to display the Bone’s desktop on a portable LCD.