JWoodrell over at the 430h forum shares his experience interfacing an optical mouse IC (AVAGO ADNS-2051) to an MSP430G2553:
My current plan is to gut optical mice for their sensor + lense i can get them for around 2-3 bucks. the first mouse i gutted had an AVAGO ADNS-2051 sensor which is nice because it has a serial interface, but also has hard quadrature X and Y outputs to track. I am going to have to wait and see which sensor these cheap mice have in them but it seems most optical mice use some avago sensor or another. I can source just the sensor chips for around 2 bucks on aliexpress, but I have yet to find a place to be able to get the lenses, so I am stuck gutting mice because they already have the sensor + lens + ancillary circuits like appropriate crystal and whatnot.
Via 43oh.
Check out the video after the break.