https://devzone.nordicsemi.com/f/nordic-q-a/63269/enter-in-sleep-mode-and-wake-up-after-one-hourHi all, I installed this app on my nrf52832 DK and it works great. I&#39;m totally newbie with Nordic and its hardware so i can&#39;t figure out how to adjust this code so the app broadcasts for 3 minutes and then goes to sleep for 1 hour. I noticed thaten-USTelligent Community 13Thu, 02 Jul 2020 13:57:13 GMThttps://devzone.nordicsemi.com/thread/258138?ContentTypeID=1Thu, 02 Jul 2020 13:57:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c7af9dc4-7cbd-4219-aa87-4aaf645df096Jared<p>Hi,</p> <p>Calling&nbsp;<span>sd_power_system_off() will put the nRF in SYSTEM OFF which is different from calling&nbsp;sd_app_evt_wait() which will basically&nbsp;put the system in SYSTEM ON sleep . A wakeup from system off will completely&nbsp;reset the whole system. What you rather want is to use a sd_app_evt_wait() with an app timer that is set to 3 minutes, which will put the system in SYSTEM ON sleep where it consumes little current until 3 minutes has passed. The application timer tutorial would be a good start for a better understanding on using timers.&nbsp;</span></p> <p><span>You can find it <a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/software-development-kit/posts/application-timer-tutorial">here</a>.</span></p> <p><span>regards</span></p> <p><span>Jared e</span></p><div style="clear:both;"></div>