I should add that the problem persists after cycling power fully, including
disconnecting the battery. So it does not look like a transient error.
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Furthermore, when I hack the library to write the calibration file even if
the sanity checks fail, just so I can see what it does, I get:
# cat /var/lib/roboticscape/mag.cal
216.160797
10.290765
38.221786
2.125283
nan
1.748049
That "nan" looks suspicious!
Is this defective hardware?
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For m
nan == "not a number". So something you've "hacked" is most likely causing
that output.
On Sat, May 13, 2017 at 11:36 AM, Michael K Johnson
wrote:
> Furthermore, when I hack the library to write the calibration file even if
> the sanity checks fail, just so I can see what it does, I get:
>
> #
On Sat, May 13, 2017 at 11:46 AM, William Hermans wrote:
> nan == "not a number". So something you've "hacked" is most likely
> causing that output.
>
Quite possibly related to sending output from an unsigned char, or
character type without first converting( casting ) to a number type. In
your
On Sat, May 13, 2017 at 11:48 AM, William Hermans wrote:
>
>
> On Sat, May 13, 2017 at 11:46 AM, William Hermans
> wrote:
>
>> nan == "not a number". So something you've "hacked" is most likely
>> causing that output.
>>
>
> Quite possibly related to sending output from an unsigned char, or
> c
Yeah, I know NaN. I've done plenty of work with floating point.
By "hack" I meant *only* disabling the sanity check that prints "ERROR:
center of fitted ellipsoid out of bounds" to see what would happen without
the sanity check. I was curious what would be written to the magnetometer
calibratio
I solved the problem.
The BeagleBone Blue was in too close proximity to the DC motors that it
drives. I removed the BBBL from the chassis and kept only the battery
connected, and now I can calibrate the magnetometer successfully. I will
have to reconsider the layout and move the BBBL further a
How far did you have to move the BB from the motors?
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I completely removed it from the chassis so far. I haven't yet experimented
to see how close it could be; I'm more likely to place it as far at as I
can to make it most accurate.
On May 14, 2017 10:32 AM, "Clark Sann" wrote:
How far did you have to move the BB from the motors?
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The implied other half of the question is I suppose how close was too
close. About 4-5cm away.
On May 14, 2017 13:22, "Michael K Johnson" wrote:
> I completely removed it from the chassis so far. I haven't yet
> experimented to see how close it could be; I'm more likely to place it as
> far at a
Thanks for that. I'm hoping I don't have any ill effects if I locate a BB Blue
6" or so away from motors. This is on a 48" radio controlled boat so I can
probably put it further away if I need to.
> On May 14, 2017, at 3:07 PM, Michael K Johnson wrote:
>
> The implied other half of the questio
I've been playing more. I don't notice an effect on the compass
(rc_test_dmp -m -c) until the IMU is within about 2cm of one of the motors
(not running). I'm sure that different motors have different magnetic
fields. I haven't even begun to explore with the motors running. I don't
know all the
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