Friday, May 31, 2019

smart cover - How do Android tablets use magnet to auto-lock the device?


Can someone explain how tablets like Nexus 7 detects a magnetic cover closing? I have tried putting magnets over the spots where the magnets in the cover are, but it will not lock. How does the tablet know if it is a cover?



Answer



It's widely believed that the Nexus 7's magnetic sensor works in an almost-identical fashion to iPads' smart cover; I couldn't find direct information about the N7, but iFixit has a great teardown of the iPad smart cover that goes into detail of how it works.


The Nexus 7 has a magnetic sensor that can tell when a magnet of sufficient pull force is nearby. The sensor is located under the screen near the pogo plug on the bottom-lefthand corner, estimated to be 45mm up from the bottom left corner and 15mm in from the left side.


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