Hi,
this project is aimed to build a low-cost simplest possible accessibility keyboard using MSP430 (MSP430G2452?), I've built something with Attiny85 V-USB in the past and I took a quick look to bbusb, mecrimus-B and boot430 but I don't really know where to start.
The initial project would consist in a simple 5 keys keyboard that emulates a mouse, keys are LEFT, UP, RIGHT, DOWN and a central CLICK button. When the user presses a button, the mouse arrow should move accordingly.
Similar devices exists in Italy and are currently used in schools but their cost is very high (around 300