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nRF5x System Off demo


This sample can be used for basic power measurement and as an example of deep sleep on Nordic platforms. The functional behavior is:

  • Busy-wait for 2 seconds

  • Sleep for 2 seconds

  • Sleep for a duration that would, by policy, cause the system to power off if the deep sleep state was not disabled

  • Turn the system off after enabling wakeup through a button press

A power monitor will be able to distinguish among these states.


This application uses nRF51 DK or nRF52 DK board for the demo.

Building, Flashing and Running

west build -b nrf52_pca10040 samples/boards/nrf52/system_off
west flash


  1. Open UART terminal.

  2. Power Cycle Device.

  3. Device will demonstrate two activity levels which can be measured.

  4. Device will demonstrate long sleep at minimal non-off power.

  5. Device will turn itself off using deep sleep state 1. Press Button 1 to wake the device and restart the application as if it had been powered back on.

Sample Output

nRF52 core output

***** Booting Zephyr OS build v2.1.0-rc1-158-gb642e1a96d17 *****

nrf52_pca10040 system off demo
Busy-wait 2 s
Sleep 2 s
Sleep 60000 ms (deep sleep minimum)
Entering system off; press BUTTON1 to restart