HMC5883 Self-Test question (closed)

[viktor_au]

First of all thanks to Ben for creating a HMC5883 component.

This magnetometer HMC5883 has a self-test function.
By trying to do that function I have some problems getting values out of array XYZ[6].
I can see Z values changing, but X and Y returns zero. I am not sure, maybe X and Y suppose to return zero.

Question
Is it a good idea to save the magnetometer readings in one go to an array or read one data register after another?
Is it possible to give an example of reading the magnetometer XYZ data?
Thank you.

[Benj]

Hello,

Can you post your program, I think I can see what you have done wrong but need to see the program to be sure.

Is it a good idea to save the magnetometer readings in one go to an array or read one data register after another?

All at once is faster and therefore probably the recommended option.
The UpdateCompassData macro basically collects all 6 readings for you allowing you to then pull out the readings at your convenience.

Is it possible to give an example of reading the magnetometer XYZ data?

Here's a very brief example.

HMC5883L.fcfx

(9.45 KiB) Downloaded 161 times

[viktor_au]

Thanks Ben

The program is attached.

[Benj]

Ok you were only reading a single register before and storing into XYZ[5].

I've changed this so now you read all 6 registers and store into XYZ[0]-[5].

HMC58883Test_2.fcfx

(48.23 KiB) Downloaded 173 times

[viktor_au]

Thank you Ben.
Understood my mistake