Currently I've linked up my Optical Flow sensor with APM 2.6 and i have followed the instruction from the arducopter wiki link. I have ensured my connection for the optical flow sensor based on looking at the Eagles file for APM and connect them accordingly.
http://copter.ardupilot.com/wiki/optical-flow-sensor/
I manage to see images captured by the mouse sensor using python. However it does not reflect any changes in x and y despite me moving the sensor around. The values are always zero.
Is there anything required to be change in the code?
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In your test sketch, is the data appearing on your serial monitor screen?