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/sci/ - Science & Math

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9525648 No.9525648 [Reply] [Original]

is it possible to make something like this to figure out orientation in a phone, but without an accelerometer? basically its just a weighted disk that falls towards gravity and it trips a sensor that lines the entire rim of the frame. that or its turns a potentiometer that's in the center. would this work? is this useful or just pointless and inefficient?

>> No.9525661

It could be "fooled" by acceleration. If you kept the phone level (visually comparing it to the horizon) while your car went around a curve, it would think it was being tilted.

A pendulum doesn't cut it. Sorry.

>> No.9525664

>>9525661
then how does an accelerometer not get fooled?

>> No.9525791

>>9525648
Congratulations, you’ve just invented a 2-dimensional gyroscope

>> No.9525811

>>9525664
by having multiple acelleromiters and using all of their data combined

I think the standard chip has 3 or four and it is tiny. Also most modern phones have both accelerometers and gyroscopes.

>> No.9525827
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9525827

>>9525648
You have entered the domain of MEMS an entirely awesome field of literal micro-machines where a startling amount of work gets done.

This shit is pretty interesting to me.

>> No.9525897

>>9525827
would going into an EE program expose me to this? seems cool.

>> No.9525909
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9525909

>>9525811
>acelleromiters

>> No.9525995

>>9525664
It does.

>> No.9526005

>>9525897

This is pretty high level stuff and technically falls into the purview of Mechanical engineering. I'm an ME and I never worked on any of this because I mostly did fluid flow stuff.

Seems like PHD work.
https://www.me.berkeley.edu/graduate-student-handbook/7210-memsnano

>> No.9526011

>>9525909
This is the science and math board not the spelling board.

>> No.9526043

>>9525664
Accelerometers DO get fooled. Einstein says they must.
To keep track of rotation in space, you need a gyroscope. This doesn't necessarily mean a spinning wheel.

Smartphones contain "tuning fork gyros"
>https://en.wikipedia.org/wiki/Vibrating_structure_gyroscope
explains the principle.

MEMS (Microelectromechanical systems) are carved out by the same photolithographic techniques used to etch microcircuits so they can be very small and cranked out by the billions for a fraction of a cent each.

The way they're made is very sophisticated but the way they operate is quite mundane. As >>9526005 said, Mechanical Engineering. (And it's good to meet a fellow ME in fluids.)

>> No.9526057

>>9525897
my major is electronics engineering and in the fourth year i have a class titled, "RF and Optical MEMS". it probably depends on the uni, and if you are doing electronics or electrical

>> No.9526159

>>9525648
what the fuck are you trying to do?

>> No.9526426

>>9525811
An accelerating reference frame is indistinguishable from one in a gravity field. There is no way to create an "acceleration proof" accelerometer.

>> No.9526532

you could use really, really, really good gyroscopes to figure out orientation, by keeping track of rotations

>> No.9526617
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9526617

>>9525791
>gyroscope
It's a plumb line you tard.