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Official agent skill

Legacy Circuit Mockups

by github in github/awesome-copilot

Generate breadboard circuit mockups and visual diagrams using HTML5 Canvas drawing techniques.

OfficialMITAuto-check passedMobile

Install Legacy Circuit Mockups

skills CLI
$ npx skills add github/awesome-copilot --skill legacy-circuit-mockups -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install github/awesome-copilot legacy-circuit-mockups --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/github/awesome-copilot.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/legacy-circuit-mockups .claude/skills/legacy-circuit-mockups && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
legacy-circuit-mockups
GitHub stars
40k
Used in
1 other repo
Token cost
~2.3k tokens
SKILL.md length
946 words
Files
21 (incl. references)
Skills in repo
417
Repo updated
First seen
Licence
MIT

At a glance

Generate breadboard circuit mockups and visual diagrams using HTML5 Canvas drawing techniques.

  • Works in 6 steps: Define breadboard dimensions and grid → Place power rail connections (+5V and GND) → Add LED component with anode/cathode… → …
  • Asked to create circuit layouts
  • SKILL.md covers When to Use This Skill, Prerequisites, Supported Components and Step-by-Step Workflows, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Legacy Circuit Mockups is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Generate breadboard circuit mockups and visual diagrams using HTML5 Canvas drawing techniques. Use when asked to create circuit layouts, visualize electronic component placements, draw breadboard diagrams, mockup 6502 builds, generate retro computer schematics, or design vintage electronics projects. Supports 555 timers, W65C02S microprocessors, 28C256 EEPROMs, W65C22 VIA chips, 7400-series logic gates, LEDs, resistors, capacitors, switches, buttons, crystals, and wires.

Its SKILL.md is about 2.3k tokens, which your agent loads only when the skill is triggered. The skill folder holds 21 other files, including reference files (for example `references/28256-eeprom.md`, `references/555.md` and `references/6502.md`).

It sits in Mobile, covering Cross-platform mobile apps and Diagrams. The repository describes itself as: Community-contributed instructions, agents, skills, and configurations to help you make the most of GitHub Copilot. The licence is MIT.

When your agent uses it

  • Asked to create circuit layouts
  • Visualize electronic component placements
  • Draw breadboard diagrams
  • Mockup 6502 builds

Example prompts

  • “/legacy-circuit-mockups”

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Define breadboard dimensions and grid
  2. Place power rail connections (+5V and GND)
  3. Add LED component with anode/cathode orientation
  4. Place current-limiting resistor
  5. Draw wire connections between components
  6. Add labels and annotations

What it can do on your machine

Read from SKILL.md and the folder at commit 727ff2e. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are javascript).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Legacy Circuit Mockups loads about 2.3k tokens when it runs, and up to ~37k if it reads all its reference files. Until then it costs about 125 tokens; SKILL.md has 946 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~125
When it runs · the whole SKILL.md, loaded when a task matches
~2.3k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~37k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from github/awesome-copilot at commit 727ff2e, republished under its MIT licence (© github). 946 words, ~2,304 tokens.

Download SKILL.mdSave it as .claude/skills/legacy-circuit-mockups/SKILL.md (or your agent's skills folder). This skill also uses 20 other files; get the full folder from GitHub.
name
legacy-circuit-mockups
description
Generate breadboard circuit mockups and visual diagrams using HTML5 Canvas drawing techniques. Use when asked to create circuit layouts, visualize electronic component placements, draw breadboard diagrams, mockup 6502 builds, generate retro computer schematics, or design vintage electronics projects. Supports 555 timers, W65C02S microprocessors, 28C256 EEPROMs, W65C22 VIA chips, 7400-series logic gates, LEDs, resistors, capacitors, switches, buttons, crystals, and wires.

Legacy Circuit Mockups

A skill for creating breadboard circuit mockups and visual diagrams for retro computing and electronics projects. This skill leverages HTML5 Canvas drawing mechanisms to render interactive circuit layouts featuring vintage components like the 6502 microprocessor, 555 timer ICs, EEPROMs, and 7400-series logic gates.

When to Use This Skill

  • User asks to "create a breadboard layout" or "mockup a circuit"
  • User wants to visualize component placement on a breadboard
  • User needs a visual reference for building a 6502 computer
  • User asks to "draw a circuit" or "diagram electronics"
  • User wants to create educational electronics visuals
  • User mentions Ben Eater tutorials or retro computing projects
  • User asks to mockup 555 timer circuits or LED projects
  • User needs to visualize wire connections between components

Prerequisites

  • Understanding of component pinouts from bundled reference files
  • Knowledge of breadboard layout conventions (rows, columns, power rails)

Supported Components

Microprocessors & Memory
ComponentPinsDescription
W65C02S40-pin DIP8-bit microprocessor with 16-bit address bus
28C25628-pin DIP32KB parallel EEPROM
W65C2240-pin DIPVersatile Interface Adapter (VIA)
6225628-pin DIP32KB static RAM
Logic & Timer ICs
ComponentPinsDescription
NE5558-pin DIPTimer IC for timing and oscillation
740014-pin DIPQuad 2-input NAND gate
740214-pin DIPQuad 2-input NOR gate
740414-pin DIPHex inverter (NOT gate)
740814-pin DIPQuad 2-input AND gate
743214-pin DIPQuad 2-input OR gate
Passive & Active Components
ComponentDescription
LEDLight emitting diode (various colors)
ResistorCurrent limiting (configurable values)
CapacitorFiltering and timing (ceramic/electrolytic)
CrystalClock oscillator
SwitchToggle switch (latching)
ButtonMomentary push button
PotentiometerVariable resistor
PhotoresistorLight-dependent resistor
Grid System
javascript
// Standard breadboard grid: 20px spacing
const gridSize = 20;
const cellX = Math.floor(x / gridSize) * gridSize;
const cellY = Math.floor(y / gridSize) * gridSize;
Component Rendering Pattern
javascript
// All components follow this structure:
{
  type: 'component-type',
  x: gridX,
  y: gridY,
  width: componentWidth,
  height: componentHeight,
  rotation: 0,  // 0, 90, 180, 270
  properties: { /* component-specific data */ }
}
Wire Connections
javascript
// Wire connection format:
{
  start: { x: startX, y: startY },
  end: { x: endX, y: endY },
  color: '#ff0000'  // Wire color coding
}

Step-by-Step Workflows

Creating a Basic LED Circuit Mockup
  1. Define breadboard dimensions and grid
  2. Place power rail connections (+5V and GND)
  3. Add LED component with anode/cathode orientation
  4. Place current-limiting resistor
  5. Draw wire connections between components
  6. Add labels and annotations
Creating a 555 Timer Circuit
  1. Place NE555 IC on breadboard (pins 1-4 left, 5-8 right)
  2. Connect pin 1 (GND) to ground rail
  3. Connect pin 8 (Vcc) to power rail
  4. Add timing resistors and capacitors
  5. Wire trigger and threshold connections
  6. Connect output to LED or other load
Creating a 6502 Microprocessor Layout
  1. Place W65C02S centered on breadboard
  2. Add 28C256 EEPROM for program storage
  3. Place W65C22 VIA for I/O
  4. Add 7400-series logic for address decoding
  5. Wire address bus (A0-A15)
  6. Wire data bus (D0-D7)
  7. Connect control signals (R/W, PHI2, RESB)
  8. Add reset button and clock crystal

Component Pinout Quick Reference

555 Timer (8-pin DIP)
PinNameFunction
1GNDGround (0V)
2TRIGTrigger (< 1/3 Vcc starts timing)
3OUTOutput (source/sink 200mA)
4RESETActive-low reset
5CTRLControl voltage (bypass with 10nF)
6THRThreshold (> 2/3 Vcc resets)
7DISDischarge (open collector)
8VccSupply (+4.5V to +16V)
W65C02S (40-pin DIP) - Key Pins
PinNameFunction
8VDDPower supply
21VSSGround
37PHI2System clock input
40RESBActive-low reset
34RWBRead/Write signal
9-25A0-A15Address bus
26-33D0-D7Data bus
28C256 EEPROM (28-pin DIP) - Key Pins
PinNameFunction
14GNDGround
28VCCPower supply
20CEChip enable (active-low)
22OEOutput enable (active-low)
27WEWrite enable (active-low)
1-10, 21-26A0-A14Address inputs
11-19I/O0-I/O7Data bus

Formulas Reference

Resistor Calculations
  • Ohm's Law: V = I × R
  • LED Current: R = (Vcc - Vled) / Iled
  • Power: P = V × I = I² × R
Show full SKILL.md (371 more words)Show less
555 Timer Formulas

Astable Mode:

  • Frequency: f = 1.44 / ((R1 + 2×R2) × C)
  • High time: t₁ = 0.693 × (R1 + R2) × C
  • Low time: t₂ = 0.693 × R2 × C
  • Duty cycle: D = (R1 + R2) / (R1 + 2×R2) × 100%

Monostable Mode:

  • Pulse width: T = 1.1 × R × C
Capacitor Calculations
  • Capacitive reactance: Xc = 1 / (2πfC)
  • Energy stored: E = ½ × C × V²

Color Coding Conventions

Wire Colors
ColorPurpose
Red+5V / Power
BlackGround
YellowClock / Timing
BlueAddress bus
GreenData bus
OrangeControl signals
WhiteGeneral purpose
LED Colors
ColorForward Voltage
Red1.8V - 2.2V
Green2.0V - 2.2V
Yellow2.0V - 2.2V
Blue3.0V - 3.5V
White3.0V - 3.5V

Build Examples

Build 1 — Single LED

Components: Red LED, 220Ω resistor, jumper wires, power source

Steps:

  1. Insert black jumper wire from power GND to row A5
  2. Insert red jumper wire from power +5V to row J5
  3. Place LED with cathode (short leg) in row aligned with GND
  4. Place 220Ω resistor between power and LED anode
Build 2 — 555 Astable Blinker

Components: NE555, LED, resistors (10kΩ, 100kΩ), capacitor (10µF)

Steps:

  1. Place 555 IC straddling center channel
  2. Connect pin 1 to GND, pin 8 to +5V
  3. Connect pin 4 to pin 8 (disable reset)
  4. Wire 10kΩ between pin 7 and +5V
  5. Wire 100kΩ between pins 6 and 7
  6. Wire 10µF between pin 6 and GND
  7. Connect pin 3 (output) to LED circuit

Troubleshooting

IssueSolution
LED doesn't lightCheck polarity (anode to +, cathode to -)
Circuit doesn't powerVerify power rail connections
IC not workingCheck VCC and GND pin connections
555 not oscillatingVerify threshold/trigger capacitor wiring
Microprocessor stuckCheck RESB is HIGH after reset pulse

References

Detailed component specifications are available in the bundled reference files:

© github, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 20 other files (references) in skills/legacy-circuit-mockups of github/awesome-copilot.

  • SKILL.md
  • references/28256-eeprom.md
  • references/555.md
  • references/6502.md
  • references/6522.md
  • references/6C62256.md
  • references/7400-series.md
  • references/assembly-compiler.md
  • references/assembly-language.md
  • references/basic-electronic-components.md
  • references/breadboard.md
  • references/common-breadboard-components.md
  • references/connecting-electronic-components.md
  • references/emulator-28256-eeprom.md
  • references/emulator-6502.md
  • references/emulator-6522.md
  • references/emulator-6C62256.md
  • references/emulator-lcd.md
  • references/lcd.md
  • references/minipro.md
  • … and 1 more

Open the folder on GitHubat commit 727ff2e

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in github/awesome-copilot, which our catalogue first saw on October 7, 2026.

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Categories

Questions about Legacy Circuit Mockups

What does Legacy Circuit Mockups do?

Generate breadboard circuit mockups and visual diagrams using HTML5 Canvas drawing techniques. Legacy Circuit Mockups is an agent skill from github/awesome-copilot, published by the product's own GitHub organization. Generate breadboard circuit mockups and visual diagrams using HTML5 Canvas drawing techniques.

When should I use Legacy Circuit Mockups?

Legacy Circuit Mockups fits situations like: asked to create circuit layouts; visualize electronic component placements; draw breadboard diagrams; mockup 6502 builds.

How do I install Legacy Circuit Mockups in Claude Code?

Run `npx skills add github/awesome-copilot --skill legacy-circuit-mockups -a claude-code`. Or copy the skill folder (skills/legacy-circuit-mockups in github/awesome-copilot) into .claude/skills/legacy-circuit-mockups in your project. Claude Code loads it when a task matches its description.

How do I install Legacy Circuit Mockups in Codex?

Run `npx skills add github/awesome-copilot --skill legacy-circuit-mockups -a codex`. Or copy the skill folder (skills/legacy-circuit-mockups in github/awesome-copilot) into .agents/skills/legacy-circuit-mockups in your project. Codex loads it when a task matches its description.

Can I use Legacy Circuit Mockups in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add github/awesome-copilot --skill legacy-circuit-mockups -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/legacy-circuit-mockups, .gemini/skills/legacy-circuit-mockups, .github/skills/legacy-circuit-mockups and .opencode/skills/legacy-circuit-mockups in your project.

What does Legacy Circuit Mockups need to run?

SKILL.md names no scripts, command-line tools or credentials: Legacy Circuit Mockups is instructions for the agent only.

Does Legacy Circuit Mockups access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Legacy Circuit Mockups safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Legacy Circuit Mockups use?

Legacy Circuit Mockups is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Legacy Circuit Mockups use?

About 2.3k tokens (SKILL.md is roughly 9.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 35k tokens, read only when the agent opens those files.

What are the alternatives to Legacy Circuit Mockups?

Skills that share tags, products or a category with Legacy Circuit Mockups: React Native Best Practices (vercel-labs/openreview, 1.7k stars), Compose Multiplatform Patterns (monta-app/ocpp-emulator, 179 stars), Creating Reanimated Animations (gluestack/gluestack-ui, 5.3k stars) and Uni-app Components and APIs (feige996/unibest, 2.3k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Legacy Circuit Mockups?

github (a GitHub organization, an official publisher) maintains it in github/awesome-copilot, which has 39,748 GitHub stars. The repository holds 417 skills in this directory. The repository was last updated on October 7, 2026.

Source: github/awesome-copilot on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.