Try these downloads for the sketches and a PDF guide (ignore the download links in that), as this appears to be the most recently updated sketch and the one I'm using.
https://www.dropbox.com/s/ucrsuni98as1yrn/FTR.ZIP?dl=0
http://sourceforge.net/projects/gy80facetrack/files/FTR_DIY_based_Tracker.pdf/download
Bear in mind when calibrating that the orientation of the board is important, so you might need to rotate it a different way to that shown.
After you've calibrated and are ready to flash the FTR sketch, in config.h there's an Inter parameter and you might find it works better if you change that to 100 (it did for me anyway). Also try reducing the Serial_Baud to 57600 if it doesn't work well at 115200.
Try open track instead of FTNoIR. I found the hatire plugin buggy in the latter. On the plugin settings screen, you should see a changing value for tps.
Get the rc9 of OT from here https://github.com/opentrack/opentrack/r...ck-2.3-rc9 and the latest version of the plugin from here https://github.com/MartinJG/OpenTrackHatireTest
In the Command tab of the Hatire settings in OT, put Z in the Center box and set the Baudrate to 115200 (or 57600 if you've changed the sketch), 8, N,1, RTS/CTS.