https://devzone.nordicsemi.com/f/nordic-q-a/14501/how-many-one-time-timer-can-i-makeHi. I&#39;m using PCA10028, SDK10.0.0, S130. I want to make one time timers as below. APP_TIMER_DEF(one_time_timer_1); APP_TIMER_DEF(one_time_timer_2); APP_TIMER_DEF(one_time_timer_3); ...... err_code = app_timer_create(&amp;one_time_timer_1, APP_TIMER_MODE_SINGLE_SHOTen-USTelligent Community 13Fri, 17 Jun 2016 08:04:58 GMThttps://devzone.nordicsemi.com/thread/55355?ContentTypeID=1Fri, 17 Jun 2016 08:04:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5bd19a31-e37d-4a7d-b201-f85154c8364croger.k<p>Thanks a lot.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/55354?ContentTypeID=1Wed, 15 Jun 2016 09:01:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:62ce961e-6f11-4499-8418-7867a7db98d2Ole Bauck<p>How many timer events that can be queued is decided by the <code>OP_QUEUES_SIZE</code> in <code>APP_TIMER_INIT()</code>. As described in the <a href="https://devzone.nordicsemi.com/tutorials/19/">app_timer tutorial</a>:</p> <blockquote> <p><code>OP_QUEUES_SIZE</code>: determines the maximum number of events that can be queued. Let&#39;s say you are calling the API function several times in a row to start a single shot timer, this determines how many times you can have queued before the queue gets full.</p> </blockquote><div style="clear:both;"></div>