The two planes I have with a pan/tilt system on them are Crossfire and my little radio cannot read in from the trainer port and at the same time output to the crossfire module. Will need to get something like a radiomaster TX16S
This unit is now out of date - see ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Q9Av10UxBEI.html which I have also built and it better, cheaper and easier to build. :)
Details of hardware and software is listed on RCGroups. Source code: code.google.com/archive/p/open-headtracker/downloads RCGroups article: www.rcgroups.com/forums/showthread.php?1677559-DIY-Headtracker-(Easy-build-No-drift-OpenSource)
This unit is now out of date - see ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Q9Av10UxBEI.html which I have also built and it's better, cheaper and easier to build.