https://devzone.nordicsemi.com/f/nordic-q-a/91826/pcb-design-layout-reviewHi I have designed a beacon with nrf51822 and this is my first time designing a pcb. I used nrf51822-QFAC-DCDC reference layout. it&#39;s a 2 layer pcb. for the antenna I used AN043 from Texas Instruments. to match the chip to 50 ohm I used discreteen-USTelligent Community 13Tue, 13 Sep 2022 07:39:46 GMThttps://devzone.nordicsemi.com/thread/385853?ContentTypeID=1Tue, 13 Sep 2022 07:39:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf36bc42-bba5-4200-935e-b8fcd4a73190Kaja<p>No problem!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/385755?ContentTypeID=1Mon, 12 Sep 2022 13:32:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bcf1e87b-0676-4e74-abad-c7e375dec600Sara<p>Thanks a lot for your help and reply.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/385671?ContentTypeID=1Mon, 12 Sep 2022 09:55:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6a7d26fc-0048-47f3-905a-1a0c4c9b7c35Kaja<p>Hi,<br /><br />this looks fine, other then that you must insert the matching components for the antenna.&nbsp;<br /><br />Unused GPIO&#39;s can be left floating.&nbsp;<br /><br />You can start with the recommended matching components, but use the VNA to verify and&nbsp;to adjust the components values: see our <a href="https://infocenter.nordicsemi.com/pdf/nwp_017.pdf?cp=17_15">WP</a></p> <p></p> [quote user=""]I used 2 sensors in this layout one BME280(U3) for monitoring ambient temperature, humidity and pressure and the other max30205 to monitor body temperature but since these sensors have different temperature range and that may hurt max0205 because of more limited range, I thought&nbsp;to use max30205 module which is shown in picture below to connect it to J2 connector once you need and disconnect it when you don&#39;t but I&nbsp;have no idea if this is gonna work?[/quote] <p>Ask the vendor for a&nbsp;recommendation.&nbsp;<br /><br />Best regards,<br />Kaja</p><div style="clear:both;"></div>