https://devzone.nordicsemi.com/f/nordic-q-a/77216/counting-ticks-vs-setting-timerHi All, wondering if anyone else has experienced this. I&#39;m currently developing a program based off of the ble_hids example in SDK17. Currently I&#39;m using the app_timer to give me a repeated trigger every 20ms. This seems to be working well based offen-USTelligent Community 13Thu, 08 Jul 2021 12:27:56 GMThttps://devzone.nordicsemi.com/thread/319169?ContentTypeID=1Thu, 08 Jul 2021 12:27:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:403cd507-15cf-4841-8a27-acd23a54482covrebekk<p>Hi&nbsp;</p> <p>How do you measure the 11ms delay when hanging in the loop?</p> <p>Do you know if you are using the internal RC oscillator or an external 32.768kHz crystal as source for the low frequency clock?</p> <p>If you use the internal RC oscillator you can have a rather large frequency offset, unless the RC calibration routine is run repeatedly (if you have a Bluetooth SoftDevice running then calibration should be run automatically).&nbsp;</p> <p>Also, I would&nbsp;recommend using a second app_timer instance to schedule this delay rather than relying on a loop. Even if you need to make your code blocking you could then go to sleep while waiting for the callback to trigger, rather than run a loop continuously.&nbsp;</p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>