** Changed in: canonical-devices-system-image
Assignee: (unassigned) => John McAleely (john.mcaleely)
** No longer affects: unity8 (Ubuntu)
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https://bugs.launchpad.net/bugs/1529592
Title:
Accelerometer has an offset
Status in Canonical System Image:
New
Bug description:
Summary:
The accelerometer data is in detail not correct. This is either a specific
hardware bug of my phone, the Aquaris 4.5 or all Aquaris phones or this is a
software bug in reading the accelerometer data of the sensor.
This might also be a root cause of bug:
https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1474225
My phone:
current build number: 28
device name: krillin
channel: ubuntu-touch/stable/bq-aquaris.en
last update: 2015-12-16 12:25:08
version version: 28
version ubuntu: 20151210
version tag: OTA-8.5
version device: 20150821-736d127
version custom: 20151111--36-46-vivid
Task 1:
I have attached a screenshot of the app "Level". I have placed the phone on a
surface which is leveled quite well.
Expectation 1:
The app level shows that the surface is leveled and the red dot is in the
middle.
Result 1:
The red dot shows an offset of about 0.5 - 1 degree to "bottom left". This
might be caused by a not fully leveled surface.
Task 2:
I have turned the phone by 90°
Expectation 2:
The red dot moves by 90° in the direction I turn the phone.
Result 2:
The red dot stays in exactly the same position (in relation to the
orientation of the phone): bottom left. This means that a second screen shot
would show exactly the same picture eventhough I have turned the phone by 90°.
Task 3:
I used "Sensor Status" - Accelerometer and I made 5 screen shots where I
placed the phone on the same leveled surface and rotated the phone to 0°, 90°,
180°, 270°, 360°.
Expectation3:
The calculation of the angles of the 5 screen shots should give 4 different
angles differing each by approx. 90°.
Result3:
Results of the „Sensor Status“ Accelerometer of the BQ Aquaris 4.5 lying on a
flat surface
angle of the phone x y calculated angle
0 -0,421 -0,277 -146,66
90 -0,43 -0,335 -142,08
180 -0,43 -0,316 -143,69
270 -0,44 -0,306 -145,18
0 -0,44 -0,296 -146,07
I have also attached the 5 screen shots and the Calc file with the
background how I came to these results.
This clearly shows that the accelerometer has an offset. This is
either a specific hardware bug of my phone, the Aquaris 4.5 or all
Aquaris phones or this is a software bug in reading the accelerometer
data of the sensor.
Uranicus
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