Individual skill
nrf52840-promicro
Firmware development for the ProMicro nRF52840 (V1940) — the nice!nano v2 compatible clone also sold as SuperMini nRF52840, nRF52840 Pro Micro or nRFMicro (nRF52840 QIAA, Cortex-M4F @ 64 MHz, 1 MB flash / 256 KB RAM, BLE 5 + 802.15.4, native USB, Adafruit UF2 bootloader with SoftDevice S140). Covers the PlatformIO + Adafruit nRF52 Arduino setup for a board that ships in neither, the vendored board definition and Pro Micro pin map, USB CDC via TinyUSB, Bluefruit BLE, the 32.768 kHz crystal that clones omit, SAADC pins, NFC pins as GPIO, and Zephyr's promicro_nrf52840 board target. Use when working on this board or any nice!nano v2 / ZMK keyboard controller: project setup, platformio.ini, pin mapping, LED not blinking, double-tap RESET and UF2/DFU flashing, SoftDevice version mismatches, a board that enumerates but never runs, or debugging why something on the board does not work.
skills/nrf/nrf52840-promicro/SKILL.md
Source commit 816967f30a7dbdf4759ad585b822eda3575f720c
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- Matches the observed repository HEAD
- Yes
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- No
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- Observed behavior
- Not checked yet
- Last checked
- Nov 11, 2026
These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.
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Repository context
- Repository stars (not skill ratings)
- 27
- Repository last updated
- Oct 30, 2026
- License
- MIT
Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.
- agentic-ai Repository topic
- arduino Repository topic
- claude-code Repository topic
- esp32 Repository topic
- mcu Repository topic
- pico Repository topic
- platformio Repository topic
- skill-md Repository topic
- skills Repository topic
- stm32 Repository topic
- testing Derived category
Files and excerpt
File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.
Browse files
SKILL.mdcore · 17,024 bytesSKILL.mdcore · 17,024 bytesassets/IMAGE.mddoc · 467 bytesreference/board-hardware.mddoc · 21,699 bytesreference/recipes.mddoc · 12,081 bytestemplate/.gitignoreasset · 13 bytestemplate/README.mddoc · 5,309 bytestemplate/boards/promicro_nrf52840.jsonasset · 1,418 bytestemplate/boards/variants/promicro_nrf52840/variant.cppasset · 1,461 bytestemplate/boards/variants/promicro_nrf52840/variant.hasset · 4,214 bytestemplate/include/board.hasset · 3,637 bytestemplate/platformio.iniasset · 1,280 bytestemplate/src/main.cppasset · 2,431 bytestemplate/variants/ble/main.cppasset · 2,373 bytestemplate/variants/minimal/main.cppasset · 937 bytestemplate/variants/new-project.shruns · 1,746 bytes
Read excerpt
# ProMicro nRF52840 (V1940)
A nice!nano v2 clone: nRF52840 module on a Pro Micro footprint, USB-C, factory
Adafruit UF2 bootloader with SoftDevice S140 6.1.1. Sold as *ProMicro
nRF52840*, *SuperMini nRF52840*, *nRF52840 Pro Micro*; the ZMK/QMK wireless
keyboard crowd is where most of the documentation lives.
Its failure modes are quiet and all look like "the board is dead": the board
is in neither PlatformIO's board list nor the Arduino core's variant list, so
half of what a tutorial tells you to type does not apply; a missing 32.768 kHz
crystal hangs the SoftDevice with USB still enumerated; and `Serial` does not
exist until you include a library that the code never otherwise mentions.
- `reference/board-hardware.md` — the complete board reference: full pin map