https://devzone.nordicsemi.com/f/nordic-q-a/51822/count-the-number-of-gpio-changesProbably, I am having a problem with finding the proper query phrase. I have a sensor (Hall-type sensor) that generates pulses, and I need to count the total number of pulses and update this number in some GATT property. I&#39;m looking for a tutorialen-USTelligent Community 13Mon, 09 Sep 2019 11:14:29 GMThttps://devzone.nordicsemi.com/thread/208642?ContentTypeID=1Mon, 09 Sep 2019 11:14:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ae65b262-518d-4f71-80c1-f6d2d86c1398bjorn-spockeli<p>Hi puff,&nbsp;</p> <p>I would recommend using the GPIO port event and tie that to the&nbsp;<span>TASKS_COUNT of a TIMER peripheral in counter mode using&nbsp;the PPI peripheral. See the&nbsp;<a title="Timer Example" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.2.0/nrf_dev_timer_example.html?cp=4_0_8_4_5_38">Timer Example</a>,&nbsp;<a title="Timer HAL and driver" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.2.0/group__nrf__timer.html?cp=4_0_8_6_6_24">Timer HAL and driver</a>,&nbsp;<a title="GPIOTE abstraction and driver" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.2.0/group__nrf__gpiote.html?cp=4_0_8_6_6_4">GPIOTE abstraction and driver</a>, and&nbsp;<a title="PPI HAL and driver" href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v12.2.0/group__nrf__ppi.html?cp=4_0_8_6_6_15">PPI HAL and driver</a>.</span></p> <p><span>Best regards</span></p> <p><span>Bjørn</span></p><div style="clear:both;"></div>