Asked 4 years, 8 months ago. Active 1 year, 4 months ago. Viewed 18k times. Airspeed Velocity At which line do you get the error? I guess it's at the accelX. First things first, the accelerometerData member of your motionManager can be nil , so you must check for that first before assuming there is value to be displayed. Note that instead of manually using a NSTimer , you can also ask iOS to update you periodically with accelerometer data. Further info here: developer. That fixed it, thanks!
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I have a couple questions though. Why is accelerometerData an optional value i.
Check the Apple docs for that specific property: developer. I think that's because when you ask iOS to start monitoring for acceleration data, at the beginning that data is not initialized, and becomes instantiated after a fraction of a second, I guess. By the way, more precisely,! However, it can still be nil as you witnessed and can still cause a runtime error if you don't check for it first.
VibraTilt: Accelerometer & Gyroscope measurement app
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Sign up using Email and Password. Post as a guest Name. Must I subscribe to some kind of event on the window object? On which devices laptops, mobile phones, tablets is this known to work? Great effort, thanks a lot. Do you think that 3 years later the answer needs any updates?
BartekBanachewicz Thanks for calling me out on this one. I will transfer the answer to "community wiki", hoping that someone with more up-to-date knowledge will update it to reflect the current state of the art. I couldn't find if this operation requires user consent. I didn't want to make a new question since it fits perfectly with your question. Maybe we can add this here? Does anyone know if this require explicit consent?
Accelerometer & Gyro Tutorial: 3 Steps
Is this the case in all browsers and all mobile OSes? Two of them are focused around orientation and the last on motion : ondeviceorientation is known to work on the desktop version of Chrome, and most Apple laptops seems to have the hardware required for this to work. The event data passed to the handler function has acceleration and accelerationIncludingGravity , which both have three fields for each axis: x , y , z The "earthquake detecting" sample website uses a series of if statements to figure out which event to attach to in a somewhat prioritized order and passes the data received to a common tilt function: if window.
In case anybody wonders - ondevicemotion works for Firefox 8. None of them works on Opera Mobile and all standard ones work fine on default Nokia N9 browser. The MozOrientation event was removed as obsolete in Firefox 6.
Step 1: The Accelerometer
So now they're all using the standardised API. This doesn't seem to work in Firefox 30, as shown in this fiddle. It is enough to register an event function for accelerometer like so: if window. Matt 7 7 bronze badges.
A Guide To using IMU (Accelerometer and Gyroscope Devices) in Embedded Applications.
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