This development board for a Fanstel BC805M (nRF52805) fits neat and tidy onto a nRF52-DK, such that the nRF52-DK can be used to program the BC805M and the BC805M can fully leverage the UART that's built into the nRF52-DK. No messy wires! When the development board is mounted onto an nRF-52, whatever suitably compiled hex files you upload to the nRF52-DK will be automatically programmed into the BC805M instead of the nRF52832 that's part of the nRF52-DK.

To take full advantage of the nRF52-DK's UART interface connection, use the nRF52-DK to configure the BC805M's pins as follows for UART:

• P0.00 -> RTS
• P0.05 -> RXI
• P0.06 -> TXO
• P0.14 -> CTS

Aside from this, four of the BC805M's other pins can be connected with LED's, and one can serve as an output pin for other purposes.

There are numerous nRF5x development boards on the market to support different modules made by different manufacturers. Some are more complete than others, but many do not contain J-Link or even a UART. That leads to a proliferation of wires if you are to interface with those boards. In contrast to those offerings, this project illustrates how to easily leverage the J-Link and UART capabilities that are part of Nordic's nRF52-DK to make your own module "development board" inexpensively by attaching a PCB that's customized to the module directly to an nRF52-DK.

Enjoy!