Timeline for What makes smartphones tilt-sensitive? Will they retain this ability in zero-gravity conditions?
Current License: CC BY-SA 3.0
21 events
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| May 15, 2017 at 7:39 | history | edited | Joren Vaes | CC BY-SA 3.0 |
Corrected the working principle of a MEMS gyro.
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| May 13, 2017 at 6:06 | history | edited | Joren Vaes | CC BY-SA 3.0 |
fixed type
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| May 12, 2017 at 19:45 | comment | added | Fattie | All modern devices also have a crappy 20 cent hall effect compass; everyone seemed to forget this! | |
| May 12, 2017 at 17:41 | comment | added | Jasmine | @FreeMan there's actually 6 total sensors, 3 gyros and 3 accelerometers, and there may be a redundant set as well. They are physically oriented along the different axes. This is produced as a single chip. I've used this one before, which includes 3 gyros, 3 accelerometers, and a 3-axis compass (magnetometer): sparkfun.com/products/11028 | |
| May 12, 2017 at 14:52 | vote | accept | paracetamol | ||
| May 12, 2017 at 13:08 | comment | added | FreeMan | How does this work to detect motion in 3 axes? Does the phone require 3 of them, each aligned along a different axis, or are there parts built in to the single chip to handle all 3 in one device? (Mind blowing images, too, thanks!) | |
| May 12, 2017 at 8:33 | comment | added | user | @Octopus By corotating at 3000 rpm. Well, briefly, at least. | |
| May 12, 2017 at 1:13 | comment | added | GreenAsJade | @JorenVaes Thanks! So obvious, but I never thought of it that way before! Really amazing stuff, and now the picture makes perfect sense! It leaves me with one question in my mind: is this really a "gyroscope" or something else? | |
| May 11, 2017 at 21:11 | comment | added | Stack Exchange Supports Israel | @Jeroen3 What you mean is there is very little inertia. | |
| May 11, 2017 at 18:30 | comment | added | Michael Seifert | A fun thing to do is to download an app onto your phone that plots the accelerometer data live as a function of time. Then drop it onto a pillow and watch all three graphs (x, y, and z) go to zero while it's falling. | |
| May 11, 2017 at 17:52 | comment | added | Jeroen3 | @Octopus You don't. You simply touch the phone chassis to the motor. And run this app. | |
| May 11, 2017 at 16:43 | comment | added | Spehro Pefhany | Gyroscopes are not angular accelerometers- they drive (vibrate) the wheel around the axis and measure the tilt of the wheel. | |
| May 11, 2017 at 16:43 | comment | added | jms | @Octopus You wouldn't attach the phone to a rotating part and sense rotation with a gyro (obviously a bad idea). You would place the phone against the engine block and use the accelerometer to pick up vibration, analyze it to get the fundamental frequency and print out the equivalent RPM. | |
| May 11, 2017 at 15:47 | comment | added | Octopus | @Jeroen, how does one read an iPhone when it is spinning at 3000rpm? | |
| May 11, 2017 at 15:01 | history | edited | Joren Vaes | CC BY-SA 3.0 |
added 1182 characters in body
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| May 11, 2017 at 14:48 | comment | added | GreenAsJade | Could you explain how what we are looking at is a gyroscope? I thought a gyroscope has to have something spinning around, but I can't spot what part of that spins... | |
| May 11, 2017 at 14:28 | history | edited | Joren Vaes | CC BY-SA 3.0 |
expanded to add some information about microgravity
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| May 11, 2017 at 14:23 | comment | added | pjc50 | Square-cube law helps a lot with durability, as it does for insects. | |
| May 11, 2017 at 14:19 | comment | added | Joren Vaes | @Jeroen3 I find the fact that they are so sensitive, yet able to withstand the massive G-forces from dropping and being thrown around in peoples pockets mind-blowing. | |
| May 11, 2017 at 14:16 | comment | added | Jeroen3 | The mass of such sensor is incredibly low, thus there is no inertia slowing the sensing down. An iPhone is able the determine the RPM of an engine up to 3000 RPM using these sensors. incredible. | |
| May 11, 2017 at 14:11 | history | answered | Joren Vaes | CC BY-SA 3.0 |