Android Buttons

From Low cost, low power, android ARM system board by - pico WiKi
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Using J9, you can enable the actions for the HOME, BACK and MENU buttons.
- Pin 11(TXD2) is for the BACK button,
- Pin 12(SPI1_SCMK) is for HOME button,
- Pin 13(RXD2) is for the MENU button.
- For Ground you can use a single pin. Pin 5 or pin 6.

Please see the images bellow.

J9 connector schematic: