A little board with most of Microchip kit, but less parts then all these boards. Only the basic components to get the microcontroller up and running the Microchip USB Library examples. PIC18F14K50 is a really basic device and after some research I found what you can do and what you can not do with it: What you can do: USB HID (Human Interface Devices) like mouse, keyboards, sensors, serial-usb converters, etc. What you can not do: USB storage devices, like USB flash drives. USB storage is a problem because of memory limitations on PIC18F14K50 family. The circuit design is very simples. Basically all you need is PIC18F14K50; 12MHz Crystal; USB connector;The circuit still have a ICSP header for device programming and debugging. It's USB powered, so you can pay attention on current drain (500mA max.).
The board is very simple and clean. I want a little device to put on breadboard or stay alone, with headers to
connect wires and breakout boards. I don't put a RESET switch on board because I think it's not necessary (does your mouse have a reset button?).