not sure if this is the RIGHT forum, but here it goes:

I'm in the process of designing an alternative PS2 or USB input device that will act as a mouse for my brother who is a quadriplegic. The devices available to him are horribly overpriced. Everything is falling into place except for one thing:

Does anyone know where I could find a spec for the communication protocol for either USB or PS2 mice?

Thanks!Here's just one from a Google search for mouse protocol which returned 22.6m hits.

Hope this is what you're looking for.

Good luckNice, I've never heard of something like this being attempted, though I guess if you are good at electronics and converting the appropriate movement into the right signal it wouldn't be too hard. I'd have to say PS/2 would probably be easier, just because I think USB is more circuitboard based.Dusty,

Thanks for the tip. UNFORTUNATELY, I did the same before and WOUND up with all pages describing the physical layer protocol- the actual signals on the wires. What I Need is the commands and data that is send by a PS2 mouse so I can program my device to act just like a mouse.

DeltaSlaya,

YEAH it's pretty easy, even with USB. They make chips now that are TTL serial input from a microcontroller and USB output. Should be a fun PROJECT.Here is a hex representation of commands. Again hope this helps.

As you say, it will be an interesting project, I hope your health insurance covers mental breakdown. LOL

Good luck