Patent ID: 8717014

Claim:
An apparatus for sensing magnetic fields, the apparatus comprising: a mother board comprising a power source; at least three substantially identical printed circuit boards configured to mount on the mother board and be powered from the power source of the mother board, wherein individual ones of the at least three substantially identical printed circuit boards comprise: a magnetic field detection element configured to produce a voltage signal in response to an applied magnetic field wherein the voltage signal corresponds to the strength of the applied magnetic field, and an amplifier operatively coupled to the voltage signal from the magnetic field detection element; at least one microcontroller operatively coupled to at least one of the amplifiers of the at least three substantially identical printed circuit boards, wherein the at least one microcontroller is configured to detect the voltage signal from the at least one of the amplifiers; wherein the at least three substantially identical printed circuit boards are configured to mount on the mother board with the magnetic field detection elements of the at least two substantially identical printed circuit boards being approximately mutually orthogonal.