Magnetic field sensors

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Has anybody experience of using magnetic field sensors like KMZ51/52? I've electric compass project based on AVRs and KMZ51/52 field sensors. If you have tips or tricks please reply.

Some other interesting magnetic field sensors:
http://parts.digikey.com/1/parts...

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You can read some information about a compass with this sensors and a PSoC at cypress web page. IIRC, it has some schematics and code, but you must be aware about circutry, since PSoC hides a lot of analog electronics inside (this is one of the best points of this uC).

Guillem.
"Common sense is the least common of the senses" Anonymous.