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atmega328p-nano SKILL.md skillA

atmega328p-nano from alexex1993/mcu-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned

mdr add alexex1993/mcu-skills/atmega328p-nano@git:20261030.816967f

Pins 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/avr/atmega328p-nano/SKILL.md
Versions recorded: 3
Latest version: git:20261030.816967f, committed Oct 30, 2026
First version recorded: Aug 21, 2026
Size: 11,611 bytes
Repository stars: 26
License: MIT

Firmware development for the Arduino Nano (A000005, ATmega328P @ 16 MHz, 5 V) — its 30 KB usable flash, 2 KB SRAM, 1 KB EEPROM, 8-channel 10-bit ADC, six 8-bit PWM pins across three timers, UART shared with the USB-serial chip, I2C on A4/A5, SPI on D10–D13, sleep modes, and the Arduino AVR core + PlatformIO setup around them. Use when working on this board or any ATmega328P Nano clone (FTDI or CH340 USB): project setup, platformio.ini, old-vs-new bootloader uploads, pin mapping, A6/A7…

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

# Arduino Nano (ATmega328P)

Board-specific firmware knowledge. The Nano is simple enough that every
failure mode is silent — the sketch compiles, uploads, runs, and does
something subtly wrong — so read the reference file rather than guessing.

- `reference/board-hardware.md` — the complete board reference: corrected pin
  map (the official manual's own tables contain errors), power tree, clock,
  memory map, connector/LED inventory **plus** a development guide (Part II:
  §8 toolchain, §10 peripheral cookbook, §11 gotchas, §12 flashing, §13
  symptom → cause → fix table).
- `reference/recipes.md` — copy-paste code: `platformio.ini`, `board.h`,
  non-blocking timing, serial + free RAM, EEPROM with update semantics, ADC
  and references, interrupts, the timer/PWM map, Servo vs `tone()`,
  power-down sleep, PROGMEM tables.
- `template/` — a **project that builds clean**, in two variants, plus a
  scaffold script. See `template/README.md`.

## Orientation

| | |
|---|---|
| MCU | ATmega328P, 8-bit AVR @ **16 MHz** (crystal — fixed, no PLL), Harvard architecture |
| Memory | 32 KB flash (30,720 B usable — 2 KB bootloader reserve), **2 KB SRAM**, 1 KB EEPROM. No DMA, no MPU |
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint

mdr add alexex1993/mcu-skills/atmega328p-nano@sha256:0c7a1156ef45c20d

The 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.

Badge

[![mdr](https://markdownregistry.com/badge/art_k7m7te34ag5mckrr.svg)](https://markdownregistry.com/a/art_k7m7te34ag5mckrr)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 3 versions of this file, between Aug 21, 2026 and Oct 30, 2026, about one every 35 days.

version	committed	commit	size	audit
git:20261030.816967f latest	2026-10-30	816967f	11,611 B	A	view · diff
git:20260823.c7a4adf	2026-08-23	c7a4adf	11,546 B	A	view · diff
git:20260821.cc0e8f7	2026-08-21	cc0e8f7	11,401 B	A	view

Audit of the latest version

A 17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.

pass: Frontmatter block present
pass: Frontmatter declares a name
pass: Frontmatter declares a description
pass: Size between 200 bytes and 200 KB (11611 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

GitHub

alexex1993/mcu-skills · 26 stars · license MIT · pushed 2026-10-30 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_k7m7te34ag5mckrr
GET https://markdownregistry.com/api/v1/resolve?ref=alexex1993/mcu-skills/atmega328p-nano
GET https://markdownregistry.com/api/v1/blob/0c7a1156ef45c20d8eb325d64db3610db3b98d433a88e2ae7151e6e82528484d

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.

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