Parts list for v1.2 - Githubissues

joric / nrfmicro

A Pro Micro alternative for wireless keyboards

https://github.com/joric/nrfmicro/wiki

The Unlicense

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Parts list for v1.2 #24

Closed tlrogers-lap closed 4 years ago

tlrogers-lap commented 4 years ago

Joric, I just purchased 4 v1.2 alpha boards and am interested in building them. It does not look like the parts list BOM here https://github.com/joric/nrfmicro/wiki/Hardware would align to the v1.2 alpha board. Might I get a parts list for the alpha?

joric commented 4 years ago

You should've waited for the release ) There a new 1.2 pre-release that's different (no AP2112K at all). Alphas should work though. You'd need a few parts, search for them on aliexpress or something:

a midmount USB-C connector for 1.6 mm pcbs
10 uH inductor (0603 package)
MCP73811 (probably will also work with an old MCP 73821, just use software pulldown for the PROG pin)
Schottky diode is now SOD-323 (smaller) I guess that's about it. You need to check schematics in Kicad to be sure because all this is kind of purposedly undocumented for now.

tlrogers-lap commented 4 years ago

Thanks a lot. Just found your github today and have been reading heavily on it as I am working on a keyboard and would like to leverage your amazing work.

Will the high voltage pre-release version still be running at 3.7 volts or was the high voltage reference going to a 5 volt version. Did not find enough info on the pre-release since you just posted it minutes ago ;^)

Trace

On May 13, 2020, at 11:35 PM, joric notifications@github.com wrote:

Closed #24.

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tlrogers-lap commented 4 years ago

Will review the Kicad now and validate. May wait to build until you reach release. Thanks again for all the work!

joric commented 4 years ago

High voltage refers to an internal nRF52840 LDO (1.8V internal current). 1.2 alpha uses internal LDO in conjunction with external LDO, 1.2 pre-release uses internal LDO and unfiltered battery/USB output, because, what the hell, all those pro micro-based keyboards are 5V and feeding 3.3V via TRRS is kind of questionnable (you could use 5V LDO there though).