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Parameters not Saving

I am setting up a new build using ArduCopter v4.0.3 on a PixRacer R15. I am using Mission Planner 1.3.74 as the GCS.

If I set the frame type as a quadcopter under setup > Mandatory Hardware > Frame Type, the parameter “FRAME_CLASS” changes from a “0” (meaning “undefined” - this is the default) to a “1” (meaning “quadcopter”). If I disconnect the quadcopter from MP, cycle the power, and reconnect it; the “FRAME_CLASS” is back to the default value of “0”. I noticed this after attempting to run through the full calibration multiple times and then getting errors stating that my compass was not calibrated even though I had just calibrated it.

I do have an SD card installed. I found a forum that mentioned it could be a bad FRAM chip on the PixRacer. Is there a way to confirm this? It’s brand new, so I would hate to scrap it if that was not the underlying issue.

I have set up several successful builds similar to this one, so I am not sure what is wrong.

Which PixRacer is this (R15 isn’t definitive)? Can you post a screen shot of the HWID screen from Mission Planner?

What is the HWID screen? I’m not familiar with that abbreviation.

HardWare ID. In Mission Planner Setup>Mandatory Hardware> HW ID

Thank you for clarifying. Here is a screenshot of the HWID page. I removed the Pixracer from the build, so the rest of the components are listed as “unknown”.

HWID|624x213

OK thanks. This is a “good” PixRacer" with 2 IMU’s. From Mro? Perhaps flash the FC again. You are using this version?
https://firmware.ardupilot.org/Copter/stable/Pixracer/

Sorry for the late reply. I ended up switching to a new Pixracer and the problem was resolved. I am guessing it had a bad FRAM chip, so it wasn’t saving any data.

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