Treadmill tracking values

[ananthamurthy]

Hey, to track the treadmill motion, we need to figure out what values are being saved by the Arduino, in the dataLine. This might be specific to the model of the mouse we're using with behaviour1 (Bheja-Fry). We might have to confirm, but I think this is the Logitech G500s.

[dilawar]

Mouse position x and y are pixel values. On behaviour box computer, these values are

dilawars@Bhallalab-common5 ~ $ xdpyinfo | grep dimensions
  dimensions:    1680x1050 pixels (444x277 millimeters)

i.e. each pixel represents 0.24628 mm . A radial velocity of v pixel / time is v*0.2463 mm/time.

I am not hardcoding this value in arduino. This factor will differ with different monitor; resolution. In post processing, one can use this value to get the speed in mm/time.

[dilawar]

These values above are not correct since I used 'ssh` and resolution of my monitory is used (I guess). To be sure, run the above command on behaviour box and divide the millimeters values by pixel value.

[ananthamurthy]

Dilawar, I think the best would be to save the values (even if pre-processed) in the dataLine. Something generic. Also, the monitor resolution, now will not change. Also, all the other values are coming from there, as well.