https://devzone.nordicsemi.com/f/nordic-q-a/309/the-heart-rate-monitor-demoI&#39;m a green hand HW Engineer. I&#39;m trying to compile, program, and run The Heart rate monitor demo though following the step in nRF51822_DK_User_Guide_v1.0.pdf . First of all, I confirm that the hardware, wire jumper, and SEGGER device must be connecteden-USTelligent Community 13Mon, 19 Aug 2013 23:42:14 GMThttps://devzone.nordicsemi.com/thread/1636?ContentTypeID=1Mon, 19 Aug 2013 23:42:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a23d8bb9-a9dc-426c-8c2e-883357735104Bastiaan<p>Now I ensure my SDK and softdevice are the lastest version which is nrf51_sdk_v4_3_0_27417 and nRF51822_DK_User_Guide_v1.2.pdf</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/1637?ContentTypeID=1Mon, 19 Aug 2013 23:42:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6c8c305d-a1d6-43fc-b526-6a197b5f0fb0Guest<p>Now I ensure my SDK and softdevice are the lastest version which is nrf51_sdk_v4_3_0_27417 and nRF51822_DK_User_Guide_v1.2.pdf</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/1635?ContentTypeID=1Mon, 19 Aug 2013 08:08:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0c8bac2e-fd21-4eb6-afee-042a77fbbe50Ole Morten<p>Have you made sure to program the softdevice before trying to run the application? Which exact SDK and softdevice version do you use?</p> <p>Also, there is an updated version of the document you&#39;re using, <a href="https://www.nordicsemi.com/eng/content/download/13239/213080/file/nRF51822_Developer_Kit_User_Guide%20v1.2.pdf">version 1.2</a>.</p><div style="clear:both;"></div>