esp32c3-oled042 SKILL.md skillA
esp32c3-oled042 from alexex1993/mcu-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add alexex1993/mcu-skills/esp32c3-oled042@git:20261030.816967fPins git:20261030.816967f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- alexex1993/mcu-skills
- Path
skills/esp32/esp32c3-oled042/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261030.816967f, committed Oct 30, 2026
- First version recorded
- Aug 24, 2026
- Size
- 13,433 bytes
- Repository stars
- 26
- License
- MIT
Firmware development for the ESP32-C3 0.42" OLED board (ESP32-C3FH4, QFN32) — the ABRobot / 01Space "ESP32-C3-0.42LCD" mini board and its clones, sold as "ESP32-C3 SuperMini with OLED" and "ESP32 C3 OLED development board". Covers its 72x40 SSD1306 OLED on I2C, the single I2C bus, blue LED on GPIO8, BOOT button on GPIO9, USB Serial/JTAG console, ADC1, Wi-Fi/BLE, and the ESP-IDF + PlatformIO setup around them. Use when working on this board or a bare ESP32-C3: project setup, platformio.ini and…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# ESP32-C3 0.42" OLED (ESP32-C3FH4) A 25 × 20 mm ESP32-C3 board with a 0.42-inch OLED glued to it. Two things make it worth a skill: **the panel is a 72 × 40 window inside a 128 × 64 controller and does not start at column 0**, and **the C3 has exactly one I2C controller, which the panel occupies**. Almost every failure on this board traces back to one of those two facts, and neither is visible from the code. There is no vendor datasheet for the board. The detail below is assembled from the schematic, the Zephyr port, published bring-ups and a working project — read the reference files rather than guessing. - `reference/board-hardware.md` — the board reference: pin table, reset-time states, strapping analysis, free pins, peripheral availability, power tree, memory and flash layout, and the display's quirks in full (Part I), **plus** a development guide (Part II: §10 toolchain, §11 sdkconfig, §12 flashing, §13 peripheral cookbook, §14 symptom → cause → fix table, §15 sources). - `reference/recipes.md` — copy-paste code: `platformio.ini`, `sdkconfig.defaults`, `board.h`, the OLED init sequence, the I2C bus, frame …
Read the whole file at its exact version.
How to install
mdr add alexex1993/mcu-skills/esp32c3-oled042@sha256:174111e01be5b210The line at the top of this page pins the label git:20261030.816967f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ulzh3wvocag62fyq)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Aug 24, 2026 and Oct 30, 2026, about one every 33 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261030.816967f latest | 2026-10-30 | 816967f | 13,433 B | A | view · diff |
| git:20260901.8fa8d1d | 2026-09-01 | 8fa8d1d | 13,361 B | A | view · diff |
| git:20260824.3f90932 | 2026-08-24 | 3f90932 | 13,040 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13433 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
alexex1993/mcu-skills · 26 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ulzh3wvocag62fyq GET https://markdownregistry.com/api/v1/resolve?ref=alexex1993/mcu-skills/esp32c3-oled042 GET https://markdownregistry.com/api/v1/blob/174111e01be5b210f88a1debef274a9aaf336479a3305f387b44160048aa9996
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.