void initHMC5843()
{
Wire.beginTransmission(0x1E);
Wire.send(0×02);
Wire.send(0×00); // continues reading
Wire.endTransmission();
}

void readxyz()
{
Wire.beginTransmission(0x1E);
Wire.send(0×03);
Wire.endTransmission();

Wire.requestFrom(0x1E, 6);
if(6 <= Wire.available())
{
int x,y,z;
x = Wire.receive() << 8;
x |= Wire.receive();
y = Wire.receive() << 8;
y |= Wire.receive();
z = Wire.receive() << 8;
z |= Wire.receive();
// [...] your stuff here (lowpass filter values, transform)
}
}

HTH

I send a email to sparkfun about this problem , this is the replay;

Hello,I’m very sorry to hear about the trouble this sensor is giving you. The example code we’ve posted on the product page (http://www.sparkfun.com/commerce/product_info.php?products_id=9371) should work perfectly, and you can load it onto an Arduino with the need of an AVR programmer. This tutorial: http://www.sparkfun.com/commerce/tutorial_info.php?tutorials_id=142, in the ‘Serial bootloading an Arduino board’ section describes how you can load the code using WinAVR.

There have been discussions of an incorrect capacitor on the board, but our tests show that the board does work with the current setup.

Hope that helps. Let me know if you have any further questions or concerns.

This output from HMC5843. If I want to change the settings below to HMC5843 output unit Tesla. How to approach.

x:-374 y:183 z:-1006
x:-1045 y:122 z:-1711
x:-4096 y:-931 z:-4096
x:-1264 y:57 z:-173
x:819 y:-440 z:-4096
x:3 y:357 z:-483

Still working on it. But we can’t figure out the date we get from the HMC, and how we have to put this in a picture of which way is north
Are you working on it too?

Is there any one did this sensor work with Arduino, if the answer YES, please upload some videos on youtube so we can see what we have to do.
Regards,

start 0x3c 0×09 restart ‘receive enable’ 0x3d ‘read byte’ stop

or

start 0x3d 0×09 ‘receive enable’ ‘read byte’ stop

The data sheet is not clear about how to read from registers other than the data registers. Given the auto incrementing of the register address for this chip, I’m not sure if you can send an address after issuing a read command (0x3d).

Any help anyone can offer is greatly appreciated. Thanks in advance.

c:/documents and settings/……/bedrijfs docs/arduino/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected unqualified-id before ‘double’

c:/documents and settings/……../bedrijfs docs/arduino/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected `)’ before ‘double’

c:/documents and settings/………./bedrijfs docs/arduino/hardware/tools/avr/lib/gcc/../../avr/include/math.h:439: error: expected `)’ before ‘double’

Where and How I have connect the CAPACITOR ? thanks