I have a question about developing prototype board firmware.https://devzone.nordicsemi.com/f/nordic-q-a/65280/i-have-a-question-about-developing-prototype-board-firmwareHello. I&#39;m going to make a prototype board and use it soon. I will make a prototype board with nrf52840 and use it soon. It&#39;s my first time developing a prototype board because I&#39;ve only used a development board. So I have a question about this. en-USTelligent Community 13Thu, 27 Aug 2020 11:58:36 GMTRE: I have a question about developing prototype board firmware.https://devzone.nordicsemi.com/thread/266723?ContentTypeID=1Thu, 27 Aug 2020 11:58:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3da40d5f-cf17-449d-b571-846a082db873Simonr<p>Hi</p> <p>First off, I would like to point you towards These application notes and white papers that we have on PCB design and antenna tuning: <a href="https://infocenter.nordicsemi.com/topic/nan_040/APP/nan_040/nan40_intro.html">nAN40 - Circuit Board Guidelines for aQFN packages</a>,&nbsp;<a href="https://infocenter.nordicsemi.com/pdf/nwp_015.pdf">nWP015 - Crystal Oscillator Design Considerations</a>, and <a href="https://infocenter.nordicsemi.com/pdf/nwp_017.pdf">nWP017 - Antenna Tuning</a>. You should also check out our <a href="https://devzone.nordicsemi.com/nordic/short-range-guides/b/hardware-and-layout">guides/blog posts here on DevZone regarding Hardware and layout</a>.</p> <p>The simplest way to create an ON/OFF button in HW would be to have one that just cuts the power to the chip. The nRF52840 is equipped with a <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fps_nrf52840%2Fpower.html&amp;&amp;anchor=register.POFCON">Power-fail comparator</a> that can be enabled in order to provide the CPU with an early warning of an impending power supply failure.</p> [quote user=""]And I&#39;m testing with nrf52DK right now, can I use the code I just developed? Should I change a lot of things other than changing the pin number?[/quote] <p>By this, do you mean if there are any changes necessary to port a project developed for the nRF52840 to work on the nRF52832?</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>