https://devzone.nordicsemi.com/f/nordic-q-a/9990/gpio-wakeup-and-system-offI have developed a custom board with a NRF51822AB on which there is no power switch. I want to power up and power down the device with a push button. Power up : The user push the button for 2 seconds to wake up the device. Power down : The device goen-USTelligent Community 13Thu, 29 Oct 2015 21:21:36 GMThttps://devzone.nordicsemi.com/thread/37045?ContentTypeID=1Thu, 29 Oct 2015 21:21:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:fe29ea90-8fa8-4685-84ea-58ce8c31d0eeDave_couling<p>On the first push, the device will go to System On. I suggest starting an app_timer with a 2sec timeout to track how long the button is held. If it times out, then start advertising the that app_timers handler function. If the user releases the button early trigger a System Off again</p><div style="clear:both;"></div>