Commit 06d2eabe authored by Sam Calisch's avatar Sam Calisch
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<p>If application requirements don't allow you to use the Feather board from Adafruit, you can also build custom boards around the available NRF52 modules.</p>
<p>The Adafruit board uses the <a href="http://www.raytac.com/download/MDBT42/MDBT42Q%20spec-Version%20C.pdf">Raytac MDBT42Q</a>, available from Digikey (PN 1597-1434-ND) for $14.</p>
<p>Fanstel also makes a variety of modules with the NRF52832 as well as the NRF52840 (with USB 2.0 support). The <a href="http://www.fanstel.com/bt832-1/">BC-832</a> is a very small module (7.8mm x 8.8mm) available for $7.60 in quantity 10. The <a href="http://www.fanstel.com/bt832-1-1/">BT-832</a> is slightly larger, but comes in a variety ranges and sells for just $5 in quantity 10.</p>
<p>Below are two custom boards, one using the Raytac module and one using the Fanstel BC832 module. They are designed to use a serial DFU bootloader for programming with a standard FTDI cable.</p>
<p><a href="raytac-ftdi/raytac-nrf-ftdi-layout.png" target="_blank"><img src="raytac-ftdi/raytac-nrf-ftdi-layout.png" width="47%" style="max-width:100%;"></a></p>
<p><a href="bc832-ftdi/bc832-nrf-ftdi-layout.png" target="_blank"><img src="bc832-ftdi/bc832-nrf-ftdi-layout.png" width="40%" style="max-width:100%;"></a></p>
<p>Below is a custom board using the Fanstel BC832 module. It is just 23mm x 18mm, and is designed to use a serial DFU bootloader for programming with a standard FTDI cable.</p>
<p><a href="bc832-ftdi/bc832-nrf-ftdi-layout.png" target="_blank"><img src="bc832-ftdi/bc832-nrf-ftdi-layout.png" width="35%" style="max-width:100%;"></a></p>
<p><a href="bc832-ftdi/board.jpg" target="_blank"><img src="bc832-ftdi/board.jpg" width="55%" style="max-width:100%;"></a></p>
<p><a href="bc832-ftdi/bc832-nrf-ftdi-traces.png">BC832 Traces</a>
<a href="bc832-ftdi/bc832-nrf-ftdi-interior.png">BC832 Interior</a></p>
<p>Making a custom board requires programming via Serial Wire Debug (SWD), at least for the bootloader. Two methods for this are described below.</p>
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