https://devzone.nordicsemi.com/f/nordic-q-a/23379/external-pin-interruptI&#39;m implementing an I2C communication and I need to set an interruption every time the sensor sets the interrupt pin to 0. I&#39;ve been checking some other posts from devzone and arrived at the conclusion that the code should look like this: Initializationen-USTelligent Community 13Wed, 12 Jul 2017 10:47:43 GMThttps://devzone.nordicsemi.com/thread/91895?ContentTypeID=1Wed, 12 Jul 2017 10:47:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f93937a6-3b3c-46bf-ba5b-a9963fbaa008J&#248;rgen Holmefjord<p>I don&#39;t understand your comment above. Have you checked if the handler is called? Either by the method described <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/">here</a> and setting breakpoint inside the handler, or by placing UART/RTT logging inside the handler?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91894?ContentTypeID=1Wed, 12 Jul 2017 05:31:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0432ac82-b32a-427e-a720-4e436058bc7cPabloGC<p>Custom board. I&#39;ve debugged it by doing pulling and, when the interruption pin goes low, a LED turns on. The behaviour with this code should be the same but it looks like it&#39;s not working at all cause the LED remains off.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/91893?ContentTypeID=1Mon, 10 Jul 2017 09:29:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:26a9c95d-ef04-4094-abdb-d20930e8a998J&#248;rgen Holmefjord<p>Are you testing this on a nRF51 DK, or a custom board? HAve you tried debugging, to check if the handler is called?</p><div style="clear:both;"></div>