https://devzone.nordicsemi.com/f/nordic-q-a/46359/power-saving-approach-with-led-data-timeHi, I am using SDK 15.3 and NRF52840 Preview DK I have a requirement where I have to glow one of 3 LEDs R-G-B (each connected to one gpio pin) for 1 second and turn it off for 29 seconds, which LED will lit up depends on a variable(eg. rgb) in myen-USTelligent Community 13Thu, 18 Apr 2019 19:14:20 GMThttps://devzone.nordicsemi.com/thread/182771?ContentTypeID=1Thu, 18 Apr 2019 19:14:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:64b5b4bf-8a71-4bc4-93a7-7b9b201e75e7Fred<p>I&#39;m assuming you use app_timer. This uses RTC which is already running on the LFCLK and therefor low-power. While waiting for a timeout, the&nbsp;CPU will be in a low-power mode (i.e. system-on, low-power). When a timeout occurs, an interrupt will be generated that will start-up the CPU and perform the actions you specified in the event handler. So, when you do this every second, that takes more power than having a 29 seconds timer and then starting a 1 second timer at its timeout and then start the 29 seconds timer again at that timeout. For power consumption, it does not matter how many app_timers you have scheduled.</p><div style="clear:both;"></div>