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Sensors in smartphones

I would like to learn on how the sensors like accelerometer, pressure sensors, light sensors and the rest actually work in smartphones. Say if we have onSensorChanged for an accelerometer in android, what actually is happening internally in order to render the output.

Can anyone help with me with resources that I can find about this.

Thanks in advance,

It might be interesting to learn about the hardware itself, but what I find intriguing are the methods for taking the data from the sensor and making it useful. It's a whole field: http://en.wikipedia.org/wiki/Digital_signal_processing also check this out: http://www.dspguide.com

You can have a look to a technical talk explaining many details about sensors. The session no tonly gives more details than usual about sensors, but also covers some interesting topics such as sensor integration. You can find the video in the provided link

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