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The Google Nexus 7 tablet has lots of reed relays and magnets.

Some toggle the screen, others activate the wireless charging dock. I suppose there is a position for activating car mode (never putting screen to sleep). I'd like to put a magnet (or several if necessary) into my car dock, so I can trigger car mode, whenever I put the tablet in there.

Unfortunatelly, I couldn't find a page, that will describe the various positions of the reed relays inside the device.

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the best way is NFC Trigger.. there is an app (nfc trigger) that can activate car mode automatically when the tag is close to the tablet

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  • Yup, you can get NFC tags pretty cheap on the internet.
    – Booger
    Commented Mar 14, 2014 at 15:39

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