Don‘t know if this was mentioned already, but I am using the Smooth Track App for iOS + Open Track on PC. 
just set your phone camera in front of you and you are all set. For me a $10 solution (cost for the app).

Works perfectly, no clip or anything needed, the App tracks your head movement through the phone camera. 

Track IR is the best addition to Flight simulation after some basic controls.  So nice to turn your head naturally to look for your reference points when flying the pattern.  Like some of the other responses, I've had mine for many many years.  

 

20 hours ago, eltair said:

I haven't tried trackir, but I made a head tracking "clip" using popsicle sticks, LEDs, a CR2032 battery holder, a switch, some wire, solder, and a bunch of hot glue. It attaches to my headphones using velcro. I use a cheap ps3eye camera and opentrack software. My first attempt used a wire coat hanger but was not rigid enough and easily bent out of shape, but worked reasonably well. Then I used the smoothtrack mobile app for a while, but it has a bit too much judder for me. Using the clip and camera is much smoother.

I used blue LEDs which I already had on hand as a test to try out head tracking with the intention of switching to IR later, but it works so well I just stuck with blue. As a bonus, I didn't need to modify the camera filter. Opentrack has an option to use only the blue channel from the camera which helps to avoid picking up ambient light. Luckily I don't have any lights behind me which would cause issues.

Camera position is important. Initially, I had it sitting under my monitor, but had issues with things blocking the camera view. Also if I looked up too high it would sometimes lose track of the LEDs. Placing the camera on top of my monitor angled down slightly and a little off to my left side where my clip is works much better and rarely gets blocked.

 

/GoFundMe to buy this man a 3d printer.   I think he'd be quite dangerous with one.   😄

A side note about light emitting tracking accessories such as the TrackClip Pro (or similar home made led devices).   When the TIR is used with the hat reflector or any other reflector,   the TIR camera is an Infra-Red light source.    When used with a tracking clip,   the camera's IR leds are turned off,   and the camera acts like a passive camera.     

I'm already staring at a 48" Oled and Phillips Hue Sync backlighting.  I don't particularly want to stare at another IR source.   /Which is one of the reasons I like the clip.

Edited July 27, 20214 yr by Waldo Pepper