orientation sensor works on some devices , and doesn't for others

i'm just starting with app inventor , made a small test app that shows device orientation angle .

when i connect via wifi using samsung galaxy S5 all works ok , orientation sensor updates pretty fast .

when i connect LG G2 via wifi nothing works 

when i download apk to LG G2 still not working .

when i download apk to LG G3 it works , orientation sensor updates pretty slow compared to galaxy S5 .

when i download apk to lenovo tablet , again , not working .

is app inventor works only with specific IMU models ? 

image of the blocks added.  (one of the variables was used to "reset the angle" , i deleted this part from block to make it simpler)

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try the compass example and let us know, if it works for oyu
How to build a simple compass app with App Inventor

➠ compass.aia

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tried the compass app. 

works on galaxy s5 .

downloaded apk to lg g2 - not working . only shows the image , nothing moves .

android ver. on lg is 4.4.2 , is it too old ?

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Did you try another compass app the phone that did not work?
There could be some reasons for it not working:
- the phone does not have an orientation sensor
- the sensor is not initialized, or enabled

Long ago I read of problems with it on some phones, but I forgot what it was exactly. You can try to google yourself.

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i checked with accelerometer sensor - same . works on galaxy but not on lg .

i wrote simple code to see if sensor enabled , and it is or both devices .

how can i initialize orientation or accelerometer sensors?

found nothing googling

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You did not tell me yet whether you tried to download a simple compass from the Playstore and see if that works on both phones.

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For example this one: https://play.google.com/store/apps/details?id=com.eclipsim.gpsstatus2

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sorry , it looks like the issue fixed . i downloaded sensor kinetics app from the app store . at first it didnt show data from the accelerometer and orientation .then i chose different settings in this app , like "rate :normal" or "rate:fastest" and it started to work .

now my app works also .

i restarted the phone and the app continues to work , without opening the sensor kinetics app .

strange .

maybe the sensor need some kind of initialization .

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That would have been my next recommendation: restart your phone.
I am happy it worked!

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