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What are the different inertial sensor in the iPad 2 3G?

Good morning everyone,

I am currently working on an algorithm that uses iPad 2 inertial sensors. I learn a lot reading the iPad 2 teardown made by iFixit.

Yet I still have some questions :

>> The iPhone 4 have 3 accelerometers, 3 gyrometers and 3 accelerometers. What about the iPad 2 3G?

>> I understand that the iPad 2 has ST Microelectronics MEMS and I found the accelerometers thanks to the reference given in the teardown (LIS331DLH). Yet it is impossible to find the gyrometer using the reference AGD8 210. Any ideas why?

>> Finally, what about the magnetic sensor (compass)? Does the iPad has ones? Is it a three axis compass or only a one axis? What is the reference of this MEMS?

Thanks a lot for your help. I need these informations in order to develop an inertial filter and I need to know what informations I will be able to use.

Have a good day.


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Hi Laurent,

I'm very interested with programming a navigation algorithm using Kalman filter with all available sensors. Apparantly iPad 2 has 3-axis accelerometers, 3-axis gyroscopes and GPS (3G version).

I'm currently using Asus Eee Pad, pretty cool, it has quite some apps that can extract sensors data, GPS, 3-axis accelerometers, 3-axis gyroscope, 3-axis magnetometers ...


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Hi Kyle,

Thank you for your response.

I am still working on the same problematic but since my question, we bought an iPad2 and started working on it. It appears that the iPad 2 has 3-axis sensors of all kind : 3-axis accelerometers, 3-axis gyros and 3-axis magnetometers (or compass) wich is perfect for the implementation of a Kalman filter for attitude estimation.

Apps like "sensor monitor" on iPad/iPhone allows to catch in real-time all these datas (and also GSP) meaning that iOS SDK allows a direct access to original datas. The developper then has to implement his algorithm, like a Kalman filter.

I started to develop on the iPad thanks to softwares like Unity or Airplay.


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Hi Laurent,

Sorry for my late response. Would you need help in implementing a Kalman filter (or higher order filter) for all the available sensors in iPad 2? I'd certainly be interested to help out of interest. Please email me at if you are interested.



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Laurent will be eternally grateful.
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