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## The Gyroscope Forum

22 August 2019 04:28

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Subject: Which way is right? and which is left?
Question: Hi, I need to ask a question about the orientation of gyroscopes and what is possible.
It's easier to explain my question by reference to a diagram, but I'll have a go to explain in words what I'm trying to achieve below. I'm not an engineer so please allow for this when reading my question. Here goes...

I have a phone ap which requires a gyroscope to work, but it needs the gyroscope to work in a 3D world.
That is, the phone can de held in all possible positions and angles by the user, front Of The Phone (OTP) facing the suser, back OTP facing the user, side OTP facing the user, bottom OTP facing the user, fiull 360 movement etc.
Regardsless of which position faces the user, the gyroscope will know which way is up because of gravity.
But how can it now which way is TRUE left as determined by the user's position?
Does that make sense?
If I hold the phone top-side up with the screen facing me (in the standards position), and I move the phone unit left the app reads this as a left movement, which is correct.
Imagine I flip the phone physically so the back of the phone faces me, surely the internal gyroscope gets confused. When the user moves the phone to his left the gyroscope thinks its moving right?

Similarly, if I rotate the phone in my hand so the phone case is physically horizonal, with the front of the phone pointing to the ground, then if I move the phone out to what I percieve as the left (and keep the horizontal style unchanged) the app will read this as movement down?

Is this how it works, and is there a solution?
Thanks
R
Date: 12 April 2012
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