https://devzone.nordicsemi.com/f/nordic-q-a/13527/frequency-measurement-using-timer-2Mt need is to do frequency measurement of 0.01Hz to 99.99 Hz We need a clock of 1us that added to a timer of that start on when the pulse low to high event happens and stop the timer when high to low occurs. ------------------------------------en-USTelligent Community 13Fri, 29 Apr 2016 13:31:05 GMThttps://devzone.nordicsemi.com/thread/51628?ContentTypeID=1Fri, 29 Apr 2016 13:31:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:469a4d7f-1e65-4bf1-9912-734cccc1c03ftesc<p>It is hard to tell based on the limited information you have provided about how you actually have set up the timer. How is the timer initialised, and how is it connected to GPIOTE? Also, how did you do it in the case of the LED toggling (when it worked)?</p><div style="clear:both;"></div>