how to plot circle from magnetometer value

[sexyday]

hi kris, i found some magnetometer calibration issue from others website(includeing here),but i still can't figure out why i can't plot circle even ellipse like these

my result is showed below. if i want to plot circle ,how to rotate my imu?whose coordinate should i refere to ?inertial z axis or imu? what should i operate with it?here are two methods what i realize from other website,which is right? or both are wrong?

[kriswiner]

Move the sensor in every direction up dowm rotate left right etc. The idea is to sample as much of the response surface as possible during the collection of the data.

On Sun, Mar 26, 2017 at 6:09 AM, sexyday notifications@github.com wrote:

hi kris, i found some magnetometer calibration issue from others website(includeing here),but i still can't figure out why i can't plot circle even ellipse like these [image: circle] https://cloud.githubusercontent.com/assets/23310147/24331136/c35def2a-1260-11e7-8688-ca4f2cd4fd51.png [image: image] https://cloud.githubusercontent.com/assets/23310147/24331158/25e7855c-1261-11e7-91cc-190a28663aad.png

my result is showed below. [image: image] https://cloud.githubusercontent.com/assets/23310147/24331203/c17242b4-1261-11e7-8bad-98bde29124d3.png if i want to plot circle ,how to rotate my imu?whose coordinate should i refere to ?inertial z axis or imu? what should i operate with it?here are two methods what i realize from other website,which is right? or both are wrong? [image: image] https://cloud.githubusercontent.com/assets/23310147/24331420/9af9dade-1266-11e7-9752-74b10b75b64e.png [image: image] https://cloud.githubusercontent.com/assets/23310147/24331499/3cf34b30-1268-11e7-9477-5abd7ad9cbae.png

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[sexyday]

still the same.

should i normalize mag value like this magn=1/(sqrt(mXmX+mYmY+mZmZ)); mX=mX magn; mY=mY magn; mZ=mZ magn;

could you tell me more detail,please

[kriswiner]

I would say no, but I don't know what you are trying to do here.

On Sun, Mar 26, 2017 at 11:27 PM, sexyday notifications@github.com wrote:

should i normalize mag value like this

   magn=1/(sqrt(mX*mX+mY*mY+mZ*mZ));
   mX=mX* magn*100;
   mY=mY* magn*100;
   mZ=mZ* magn*100;

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[sexyday]

i have a new question.when there is pitch or roll angle occured ,yaw angle will be inaccurate. how to solve this problem?i find a solution the picture shows below. but the problem still occure.

[kriswiner]

I have no idea what you are trying to do.

On Mon, May 8, 2017 at 5:31 AM, sexyday notifications@github.com wrote:

i have a new question.when there is pitch or roll angle occured ,yaw angle will be inaccurate. how to solve this problem?i find a solution the picture shows below. [image: 222] https://cloud.githubusercontent.com/assets/23310147/25804041/62da70a4-342c-11e7-9e28-0278bc3129bd.png but the problem still occure.

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