How do I take an nrf52840 Devkit prototype to custom PCB

[davidm]

Hi all

I am working on Bluetooth application using NRF52840 kit. The application is very simple, the device would have about 7 push buttons which when pressed data will simply be  sent to the nearby connected peer device. I am planning to take this to production soon, so I am trying to figure out the how to get started on the schematic and BOM list. But I am not very clear with the process of taking it from Devkit prototype to custom PCB for Nordic/nrf52 products. I came across a  reference layout for nrf52840  and I know the next step is to create the schematic but still, I am not sure how to proceed from here. In addition to nrf52840 SoC, the other components needed for my custom device  are 7 push buttons, 8 10K ohm resistors, and 1 led.

For now, I have one question, based on my needs how do I proceed from here(create schematic and find BOM list)?

Thank you in advance

[Nguyen Hoan Hoang]

I would recommend using existing certified module like this one https://www.crowdsupply.com/i-syst/blyst-nano.  It would reduce a of development time and reducing risks.  The module has everything builtin 32768 Hz RTC crystal, DC/DC coils.  Only thing need to add is power.  Although this module is nRF52832 based, your application does not seem require a nRF52840.  It with work well without changing your code.  Just need to use with S132 instead S140.