Magnetometer hardware/software question

[Mark Braunstein]

I've completed assembly of my PSWS magnetometer and have been able to run the Raspberry Pi command line to produce readings of the temperature sensor and RM3100 board. Data continuously streams to the display in one-second intervals. 

I'm concerned that there may be a hardware failure in my RM3100 board. When I hold the magnetometer assembly at various angles in 3D space, I never see the X values change. The Y and Z values change with orientation; the X values remain close to zero. 

Is the magnetometer supposed to report the X values or is this channel disabled in software? 

73,

Mark Braunstein WA4KFZ

[ghby...@k9trv.org]

I reached out to Mark by phone just now, and confirmed that he had purchased this magnetometer kit from TAPR at Hamvention several years ago.

 

It sounds like one of the axis sensors on the RM3100 board has malfunctioned.  The RM3100 is talked to using I2C.  It is able to get responses from 2 of the 3 sensors.

 

Mark will bring his magnetometer to Hamvention, as he is coming.  We will try to figure out what has happened, up to and including replacing his current RM3100 module with a new one.

 

There is a possibly unpublished document from Majid Mokhtari regarding PVC pipe parts and similar that should be available somewhere.  I attach it now for reference.  Perhaps it has been updated?  There is a shorter and less informative document on the HamSCI site that is linked to from the TAPR product page.

 

73,

George K9TRV

TAPR store manager

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