MPU9150 - Magnetometer/Compass support

[GOHO]

I download your code and compiled this to my Leonardo. It works fine but how do I access the Compass or Magnetometer output? I see only Accel and gyro....

[gregd72002]

MPU9150 has a magnetometer. Compass data (heading) has to be calculated based on the magnetometer data.

To get magnetometer working you will need to alter the sensor initialisation in mpu.cpp:
mpu_set_sensors(INV_XYZ_GYRO I INV_XYZ_ACCEL I INV_XYZ_COMPASS)

And set the sample rate for compass:
mpu_set_compass_sample_rate(50);

To read data: mpu_get_compass_reg(comp,NULL);
Where comp is short[3].

See: https://github.com/rpicopter/AvrMiniCopter/blob/master/arduino/mpu.cpp

[GOHO]

Thank you for the quick reply!!!

Merry Christmas!

Greg

Sent from my iPhone

On Dec 27, 2014, at 8:00 AM, gregd72002 [email protected] wrote:

MPU9150 has a magnetometer. Compass data (heading) has to be calculated based on the magnetometer data.

To get magnetometer working you will need to alter the sensor initialisation in mpu.cpp:
mpu_set_sensors(INV_XYZ_GYRO I INV_XYZ_ACCEL I INV_XYZ_COMPASS)

And set the sample rate for compass:
mpu_set_compass_sample_rate(50);

To read data: mpu_get_compass_reg(comp,NULL);
Where comp is short[3].

See: https://github.com/rpicopter/AvrMiniCopter/blob/master/arduino/mpu.cpp

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[GOHO]

One more question, what file do i add the compass sample rate? Do i add it to the mpu.cpp or my main sketch?

Thanks!
Greg

Sent from my iPhone

On Dec 27, 2014, at 8:00 AM, gregd72002 [email protected] wrote:

MPU9150 has a magnetometer. Compass data (heading) has to be calculated based on the magnetometer data.

To get magnetometer working you will need to alter the sensor initialisation in mpu.cpp:
mpu_set_sensors(INV_XYZ_GYRO I INV_XYZ_ACCEL I INV_XYZ_COMPASS)

And set the sample rate for compass:
mpu_set_compass_sample_rate(50);

To read data: mpu_get_compass_reg(comp,NULL);
Where comp is short[3].

See: https://github.com/rpicopter/AvrMiniCopter/blob/master/arduino/mpu.cpp

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[gregd72002]

it should be in mpu.cpp in mympu_open function.
Similar to this: https://github.com/rpicopter/AvrMiniCopter/blob/master/arduino/mpu.cpp#L68

Please do not forget to create a pull request once you are finished.

Thanks

[GOHO]

Ok found the set rate for compass in the mpu.cpp but what about the read compass, does that go into the mpu.cpp?

In the main sketch you have
mympu.gyro &
mympu.y.
To read the sensor, does the compass have the same type read command?

Thanks again

Greg

Sent from my iPhone

On Dec 27, 2014, at 8:00 AM, gregd72002 [email protected] wrote:

MPU9150 has a magnetometer. Compass data (heading) has to be calculated based on the magnetometer data.

To get magnetometer working you will need to alter the sensor initialisation in mpu.cpp:
mpu_set_sensors(INV_XYZ_GYRO I INV_XYZ_ACCEL I INV_XYZ_COMPASS)

And set the sample rate for compass:
mpu_set_compass_sample_rate(50);

To read data: mpu_get_compass_reg(comp,NULL);
Where comp is short[3].

See: https://github.com/rpicopter/AvrMiniCopter/blob/master/arduino/mpu.cpp

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[GOHO]

I appreciate all your help

Im am not sure what you mean by pull request.

G

Sent from my iPhone

On Dec 27, 2014, at 11:29 AM, gregd72002 [email protected] wrote:

it should be in mpu.cpp in mympu_open function.
Similar to this: https://github.com/rpicopter/AvrMiniCopter/blob/master/arduino/mpu.cpp#L68

Please do not forget to create a pull request once you are finished.

Thanks

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[gregd72002]

it should go to mpu.cpp

As for the pull request I meant to contribute your work to this project.
See: https://help.github.com/articles/using-pull-requests/

[GOHO]

Hi Greg, I put the commands in the mpu.cpp and the sketch compiles ok until I try and call up the compass.
I used the command "mympu.comp[0]"
but this is the error I get....

This report would have more information with "Show verbose output during compilation" enabled in File > Preferences.Arduino: 1.0.6 (Windows 7), Board: "Arduino Leonardo"AvrCopter.ino: In function 'void loop()':AvrCopter:44: error: 'struct s_mympu' has no member named 'comp'

Im really sorry for being a pain in the Ass!!! I sure appreciate your help in getting this to compile and run...

How should I call up the compass in my sketch to see my heading? I would try the link you sent me but the leonardo does not have enough memory to run it...

Greg Bounds772-571-7911

Date: Sat, 27 Dec 2014 08:53:33 -0800
From: [email protected]
To: [email protected]
CC: [email protected]
Subject: Re: [ArduinoMotionSensorExample] MPU9150 (#2)

it should go to mpu.cpp

As for the pull request I meant to contribute your work to this project.

See: https://help.github.com/articles/using-pull-requests/

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