Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add alexex1993/mcu-skills --skill atmega328p-nanogit clone --depth 1 https://github.com/alexex1993/mcu-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/alexex1993/mcu-skills/atmega328p-nano)<a href="https://agentmods.dev/skills/alexex1993/mcu-skills/atmega328p-nano"><img src="https://agentmods.dev/badge/skills/alexex1993/mcu-skills/atmega328p-nano/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/alexex1993/mcu-skills/atmega328p-nano"><img src="https://agentmods.dev/badge/skills/alexex1993/mcu-skills/atmega328p-nano.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium analysis-evasion · line 1 Suspicious Unicode normalization or mixed-script contentFix: Review the flagged content for security risks. Ensure no credentials, secrets, or sensitive data are exposed.
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00190 | $0.03235 |
| Opus 5.5 | $0.00076 | $0.01294 |
| Sonnet 5.5 | $0.00038 | $0.00647 |
| Haiku 4.5 | $0.00019 | $0.00324 |
Grade A, and why
atmega328p-nano scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 205 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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 vstone(), power-down sleep, PROGMEM tables.template/— a project that builds clean, in two variants, plus a scaffold script. Seetemplate/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 |
| LED / button | L = D13 (LED_BUILTIN), on = HIGH · RESET button, active-low |
| ADC | 8 × 10-bit, 0–5 V, ~100 µs per analogRead(); A6/A7 are analog-input only |
| PWM | 6 × 8-bit: D3, D11 (~490 Hz, Timer2), D9, D10 (~490 Hz, Timer1), D5, D6 (~980 Hz, Timer0) |
| UART | D0/D1 — shared with the USB-serial chip, not free pins |
| I2C / SPI | A4=SDA, A5=SCL · D10=SS, D11=MOSI, D12=MISO, D13=SCK (+ICSP header) |
| Power | 5 V logic. USB Mini-B, VIN 7–12 V via LDO, +5V pin (bypasses regulator). 3V3 pin 50 mA max |
| Debug | No SWD/JTAG — only the 6-pin ICSP header (pin 1 at the outer edge; some diagrams rotate it 180°) |
| Toolchain | PlatformIO 6.1 + atmelavr 5.3.0 + Arduino AVR core, board = nanoatmega328new (Optiboot) / nanoatmega328 (old bootloader) |
Rules that prevent the expensive mistakes
What ships with it
10 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- assets/IMAGE.md 432 B
- reference/board-hardware.md 30 KB
- reference/recipes.md 9.7 KB
- template/.gitignore 13 B
- template/include/board.h 2.5 KB
- template/platformio.ini 1.1 KB
- template/README.md 2.8 KB
- template/src/main.cpp 3.1 KB
- template/variants/minimal/main.cpp 535 B
- template/variants/new-project.sh 1.3 KB runs code
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 6d ago Changed · +2 lines · +190 tokens per session 0c7a1156ef45
- 2mo ago First seen · 203 lines · 0 tokens per session scan A 31563dc4a248
atmega328p-nano is a skill published in the GitHub repository alexex1993/mcu-skills (25 stars, last pushed 7d ago), licensed MIT. It adds 190 tokens to every session and 3,235 once invoked, about $0.0008 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
atmega328p-nano compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| atmega328p-nanoalexex1993/mcu-skills | Skill | 25 | 7d ago | MIT | A | 190 | Claude Code, Codex |
| iot-developerdaffy0208/ai-dev-standards | Skill | 39 | 10mo ago | MIT | A | 18 | Claude Code, Codex |
| edge-iotmiles990/claude-software-skills | Skill | 26 | 9mo ago | MIT | B | 15 | Claude Code, Codex |
| ruview-configureruvnet/RuView | Skill | 103k | yesterday | MIT | A | 67 | Claude Code |
| ruview-applicationsruvnet/RuView | Skill | 103k | yesterday | MIT | A | 79 | Claude Code |
| provision-noderuvnet/RuView | Skill | 103k | yesterday | MIT | A | 52 | Claude Code |
| spark-environment-setupwshobson/agents | Skill | 42k | yesterday | MIT | A | 76 | Claude Code |