agentmods.dev

circuit-debugger

circuit-debugger is a skill for Claude Code from wedsamuel1230/arduino-skills. It costs 74 tokens per session (1,906 once invoked), scanned A, original, MIT.

A step-by-step guide for diagnosing Arduino, ESP32, and RP2040 circuits. It uses visual checks, power and continuity tests, signal tracing, and small diagnostic sketches.

In plain words
What is it for?
Use it when a circuit has no power, a sensor does not respond, an LED or motor fails, parts get hot, or the system behaves intermittently.
Why use it?
It provides a repeatable way to find whether a failure comes from wiring, power, signals, components, or code.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the arduino-skills plugin — 33 skills shipped together

not rated 24repo 2mo ago A scan SkillSpector: warn 74 tokens original MIT

Good fit Use it when a circuit has no power, a sensor does not respond, an LED or motor fails, parts get hot, or the system behaves intermittently.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/wedsamuel1230/arduino-skills/circuit-debugger
View source ↗ wedsamuel1230/arduino-skills
Install

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.

Any agent
npx skills add wedsamuel1230/arduino-skills --skill circuit-debugger
Clone the repo
git clone --depth 1 https://github.com/wedsamuel1230/arduino-skills

Made for: Claude Code.

Or install arduino-skills, the plugin that ships this one along with the rest of its 33 skills.

Wrote 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.

agentmods badge for circuit-debugger

README.md
[![agentmods](https://agentmods.dev/badge/skills/wedsamuel1230/arduino-skills/circuit-debugger/github.svg)](https://agentmods.dev/skills/wedsamuel1230/arduino-skills/circuit-debugger)
Your own site
<a href="https://agentmods.dev/skills/wedsamuel1230/arduino-skills/circuit-debugger"><img src="https://agentmods.dev/badge/skills/wedsamuel1230/arduino-skills/circuit-debugger/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.

agentmods 80×15 button for circuit-debugger

Your own site · 80×15
<a href="https://agentmods.dev/skills/wedsamuel1230/arduino-skills/circuit-debugger"><img src="https://agentmods.dev/badge/skills/wedsamuel1230/arduino-skills/circuit-debugger.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 74 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,906 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector warn 7 Sept 2026
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 content
    Fix: Review the flagged content for security risks. Ensure no credentials, secrets, or sensitive data are exposed.
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00074 $0.01906
Opus 5.5 $0.00030 $0.00762
Sonnet 5.5 $0.00015 $0.00381
Haiku 4.5 $0.00007 $0.00191

Measured 2mo ago against content hash 661d1bdc4a91, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

circuit-debugger 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/generate_debug_sketch.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

skills/circuit-debugger/SKILL.md · 247 lines

How it starts

The opening of the file, as written. The whole thing — 247 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Circuit Debugger

Systematic approach to diagnosing hardware issues in maker projects.

Resources

This skill includes bundled tools and references:

  • scripts/generate_debug_sketch.py - Arduino sketch generator for I2C scanner, GPIO tester, ADC checker, PWM tester
  • references/measurement-procedures.md - Comprehensive multimeter and oscilloscope guide

Quick Start

Generate I2C scanner:

uv run --no-project scripts/generate_debug_sketch.py --i2c --output i2c_scanner.ino

Generate GPIO tester:

uv run --no-project scripts/generate_debug_sketch.py --gpio --pins 2,3,4,5 --output gpio_test.ino

Generate all debug sketches:

uv run --no-project scripts/generate_debug_sketch.py --all

Interactive mode:

uv run --no-project scripts/generate_debug_sketch.py --interactive

Trigger Phrases

  • "My circuit doesn't work"
  • "Component is getting hot"
  • "No power to the board"
  • "Sensor not responding"
  • "Intermittent/random failures"
  • "Works sometimes, not others"

Debugging Protocol

Phase 1: Power System Check (Do First!)

Visual Inspection (30 seconds)

□ Check for smoke, burn marks, or melted plastic
□ Verify power LED on microcontroller is lit
□ Look for loose wires or cold solder joints
□ Confirm correct polarity on polarized components (LEDs, caps, diodes)

Multimeter Tests (Set to DC Voltage)

Test Point              | Expected Value  | If Wrong
------------------------|-----------------|------------------
VCC to GND on MCU       | 3.3V or 5V      | Check regulator, power source
Sensor VCC pin          | Match datasheet | Check wiring, broken trace
Motor driver VCC        | Logic + Motor V | Separate supplies needed?
Battery terminals       | Rated voltage   | Dead/discharged battery

Common Power Issues:

Symptom Likely Cause Fix
No voltage anywhere Disconnected power, blown fuse Check continuity from source
Low voltage (< 4V when expecting 5V) Overloaded supply, bad regulator Reduce load, check current draw
Voltage drops under load Undersized power supply Calculate total current, upgrade PSU
Reverse polarity Swapped wires Check all connections, may have damaged components

Read the full file on GitHub · 247 lines

Files

What ships with it

4 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.

Changes

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.

  1. 2mo ago First seen · 247 lines · 74 tokens per session scan A 661d1bdc4a91

Subscribe to this mod's changes

circuit-debugger is a skill published in the GitHub repository wedsamuel1230/arduino-skills (24 stars, last pushed 2mo ago), licensed MIT. It adds 74 tokens to every session and 1,906 once invoked, about $0.0003 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.

Code GenerationDebuggingHardware and IoTarduinoembedded-systemsmakermit-licenseskills
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