My immediate thought is to use an infrared transmitter with
several receivers, measuring the received intensity at each
and coming up with a vector for the direction the LED points.

You could do this with 6 or 8 receivers, frequency modulation,
and a good demodulation circuit.  We use a similar device for
measuring intensity of reflected IR, but it would be easy to
modify for reception at a distance.

Mike H.

PS- Do you know how you're going to convey this info to the
flight sim?  I'd think that would be a bigger hurdle...

>I'm a big fan of flight similators and I bought na
>i-glasses HMD but without a head tracker it's not
>as nice.
>
>The Intertrax 2 head tracker costs $999 and it's to
>expensive for me, so I thought, as I'm good with PICs
>why not develop one myself, but with piclist help, of course.
>
>I was thinking about using the Analog Devices accelerometers
>ADXL311 and gyroscope ADXRS300.
>
>Any ideas?
>
>Octavio Nogueira
>Tato Equipamentos Eletrtnicos Ltda
>(11) 5506-5335
>======================================================
>nogueira@tato.ind.br                  ICQ# 19841898
>BASIC Step - O microcontrolador mais facil do mercado
>BACOM - O mais poderoso compilador BASIC para ATMEL
>http://www.tato.ind.br
>ProPic tools - low cost PIC programmer and emulator
>http://www.propic2.com
>======================================================
>
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