https://devzone.nordicsemi.com/f/nordic-q-a/61164/falling-edge-detection-through-i-o-expander-thingy-52Hello everyone. Iam working on a project where i need to detect a falling edge from a ADC (ADS1298) when new data is ready at a sample rate of 500SPS. I have the issue that all the fast changing pins are used for the SPI communication with the ADCen-USTelligent Community 13Mon, 11 May 2020 07:42:59 GMThttps://devzone.nordicsemi.com/thread/249094?ContentTypeID=1Mon, 11 May 2020 07:42:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:98b8a6c6-3219-4c04-957c-d18b8586f6e7Rilleaa<p>Thx Ketiljo for the reply then i know what would be a better way of doing it. At the moment i got it to work on the EXT pinns but using interupts is&nbsp;obviously better as the processor can handle other processes in between interupts.</p> <p></p> <p>//Rilleaa</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/248992?ContentTypeID=1Fri, 08 May 2020 13:57:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8c8f20b8-56df-46cd-b6ad-3dca0409a9feketiljo<p>It will probably be better to use a direct GPIO. MOS1 is connected to P0.18. If you remove Q6, you can solder a wire directly to the pad and use that to detect the interrupt from the ADC.&nbsp;&nbsp;</p><div style="clear:both;"></div>