https://devzone.nordicsemi.com/f/nordic-q-a/5939/how-to-count-pulse-with-nrf51822-revisitedI am trying to implement the pulse counting mentioned in a previous post of the same name, but the code is eluding me. I am using the heart rate service example with new code shown below. Tomorrow I will instrument the code more, but I could use someen-USTelligent Community 13Mon, 14 Aug 2017 06:53:29 GMThttps://devzone.nordicsemi.com/thread/20686?ContentTypeID=1Mon, 14 Aug 2017 06:53:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:80336ac5-2e91-407d-8759-91fb8cc01ec7Thiru<p>can&#39;t we assign the GPOI pin to counter so that when ever change happen in the pin counter will increment.</p> <p>instead of using PPI</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/20687?ContentTypeID=1Fri, 13 Mar 2015 15:01:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de90884a-5cd7-47ac-b7ad-55dca9abbc75Stefan Birnir Sverrisson<p>Hi Henry</p> <p>Thank you for your question. Sorry for my late response.</p> <p>I have updated the thread you are probably referring to, <a href="https://devzone.nordicsemi.com/question/30801/how-to-count-pulse-with-nrf51822/?answer=31087#post-id-31087">see here</a>, but you are correct, the input signal can also be detected with GPIOTE. You seem to be on the right track.</p> <p>I see you enable three PPI channels but you only use one.</p> <p>I think it is not necessary to configure the PWM_INPUT_PIN_NUMBER twice as input. It should be sufficient to configure it only as sense input, as done in <a href="https://github.com/NordicSemiconductor/nrf51-powerdown-examples/blob/master/system-on-wakeup-on-gpio/main.c">this example</a>.</p><div style="clear:both;"></div>