At least :
to me, as it is, this project cannot work efficiently.
the fgm-3 specs, on the speake's site talk about different resolutions / sensitivity for two different sensors, so one sensor moves in frequency faster than the other, even if correctly aligned.
I have for example made the tests, one of my sensors moves from 4000hz for e/w to n/s, and the other 1500hz for the same movement.
Test made in a magnetic perturbance free environment, sensor first put on a e/w alignement, rotated to have the max frequency value.
You must reprogram the pic to put some constants to take this sensitivity difference, so to me this project is unusable, and simply doesn't work.
Dont build it, dont buy the components, it's a pure waste of time, instead learning how it works, but you will not find anything with the epe (or maybe be very lucky and have exactly two fgm-3 exactly the same, but I wasn't)
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