Optical mouse sensors?

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Gordon
Some progress now! I got a second optical mouse and it's a different PCB, but basically the same inside, with the same sensor (see pic) - albeit marked KA8 DB280DA this time.

I was just about to post a question on stackexchange about the mythical KA8 sensor and I stumbled across the PAW3204 datasheet

The protocol looks the same (but the chip has a different pattern of markings on it), so it seems like the KA8 is probably a clone of the PAW3204:
```
0x00 // Query: product ID
0x30 // Response: Product ID, 0x30 default
0x02 // Query: Motion_Status 
0x?? // Response bitfield: Bit 7 = motion, Bits 2-0 = resolution
```
So that's all great - apart from the bit where this particular sensor doesn't seem to do the sensor readout thing (which pretty much all the others do!). Looks like it'd be trivial to use as an optical flow sensor, but unless there are hidden registers in there for debugging (which seems likely) it's not capable of doing the sensor readout :(

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