LED level with SEEED XIAO SAMD21 and MPU6050

I'll take a WAG at your problem.  The gyroscope behaves pretty different from most sensors in that it has a lot of drift issues. 

It might be instructive if you if print out more intermediate values... say... the output from the initialization and for every loop.  You will fill up the print buffer, but it might be instructive to see the initial trends.  

You also might add your full program (the above is not complete).  I might have a MPU6050 want to try to see the problem on my equipment.  I don't have the SEEED, but I don't think this is an MPU or even an MPU6050 issue.

I don't know if this thread will be of help, but it might highlight some of the issues with gyros.

https://forum.dronebotworkshop.com/sensors-modules/inertial-navigation-system-ins-gyros-accelerometers-magnetometers/  

Thanks for the reply! I will take a look at the other forum as well. As for the code, that is all I have and it is what I am running. I am not sure what you mean by incomplete. This is the first code I have ever modified/written ever so I am probably missing something for sure...

Posted by: @duster180

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Thanks for the reply! I will take a look at the other forum as well. As for the code, that is all I have and it is what I am running. I am not sure what you mean by incomplete. This is the first code I have ever modified/written ever so I am probably missing something for sure...

It simply didn't have the end brace and I didn't look at the entire code closely enough to determine if it was complete.  Just assumed you abbreviated what you supplied us.  Before diving into all that other thread, I'd get some more output of the setup() and every loop() instead of after 1000 iterations.  Again... it'll probably blow up the serial output, but, you might find something helpful, pointing you to the problem.  I'm guessing that it's overflowing the float... that what NaN typically means.  It's rare since a float is 3.4E+/-38. 

@duster180 When you see Not A Number, the most common cause is caused by mixing float and int. If you have to have int variables, then cast them to the correct float size. The easiest way to track this down is to print each step of the calculations.

Thanks everyone for helping! I was able to change the math around a bit and monitor each individual read out and track down the issues...Now I just need to get my solid model printed up and should be good to go.

Thanks again for the help!