https://devzone.nordicsemi.com/f/nordic-q-a/125215/problem-with-configuration-of-nrf-connect-sdkHi, I am following the course &quot;nRF Connect SDK Fundamentals&quot; and am almost at a standstill when it comes to progress. I am still struggling with lesson 1 and lesson 2. I have managed to define a customer board with i2c, buttons and leds, but whenen-USTelligent Community 13Mon, 27 Oct 2025 12:31:14 GMThttps://devzone.nordicsemi.com/thread/552471?ContentTypeID=1Mon, 27 Oct 2025 12:31:14 GMT137ad170-7792-4731-bb38-c0d22fbe4515:67e93a09-6db7-40ac-adbd-90f2e187fd74Priyanka<p>Hi Svein,</p> <p>There are two blinky samples, and <a href="https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/lessons/lesson-1-nrf-connect-sdk-introduction/topic/exercise-2-1/">according to the Fundamentals course</a>, you are supposed to work with the zephyr/samples/basic/blinky sample and I can see that this works well for you.</p> [quote user=""]but no main.c file is generated.[/quote] <p>That&#39;s expected, because when you build a sample, no main file will be generated. A main.c file is something that you need to include in the project file before building. When you create an application from the blinky sample, the main.c file should be copied from the sample directory to your application directory.</p> <p>Since the other sample you are trying,&nbsp;<span>nrf/samples/zephyr/basic/blinky, is an nrf-specific sample, you might need to include some additional configs, or requirements maybe. You might be able to find out what you need to do by analysing the error that you get.&nbsp;For custom board development with nRF Connect SDK, you can also go through the&nbsp;&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/116624/unable-to-build-blinky-sample-for-custom-nrf52805-board-missed-steps" rel="noopener noreferrer" target="_blank">DevAcademy Lesson 3&nbsp;</a></span></p> <p><span>-Priyanka</span></p><div style="clear:both;"></div>