Document Your Arduino Project on GitHub

Write a professional README and circuit diagram for your Arduino project.

Introduction

30 Second Summary

You've built something cool with your hands. An Arduino that measures distance with sound waves. But if you can't show someone else how to replicate it, that knowledge lives only in your head and your tangled breadboard wires.

In this project, you will create a professional GitHub repository that documents your ultrasonic distance meter with structured Markdown, a circuit diagram, and everything someone needs to rebuild your project from scratch.

What You'll Build

A professional GitHub repository for your ultrasonic distance meter project, complete with a polished README, a Fritzing circuit diagram, and a reusable documentation template for all your future hardware projects.

By the end of this project, you'll have:

  • A structured repository with separate folders for source code, images, and documentation.
  • A complete README.md written in Markdown with hardware components, wiring tables, a circuit diagram, and software instructions.
  • A Fritzing breadboard diagram exported as PNG and embedded in your documentation.
  • Secret Mission: Add a "How It Works" technical explanation and a Troubleshooting guide to take your documentation from assembly instructions to a learning resource.

Are there any prerequisites?

This project assumes you already have a working Arduino Uno R3 + HC-SR04 + 16x2 LCD distance meter project. You need your physical circuit assembled and your working Arduino code ready to document.

You will also need a GitHub account and GitHub Desktop installed on your Windows machine.

Set Up Your Repository and Folder Structure

A professional hardware project needs more than just working code. When someone visits your repository, a clear folder structure helps them find circuit diagrams, source code, and documentation without digging through a mess of files.

In this step, you'll create a Git repository using GitHub Desktop and organize it with folders designed for hardware projects.

In this step, get ready to:
  • Create a local repository with GitHub Desktop.
  • Set up images/ and src/ folders.
  • Place your Arduino distance meter code into the repository.
Create your repository and folder structure

A repository is the container that holds all your project files and tracks every change you make. GitHub Desktop makes creating one straightforward.

  • Press the Windows key to open your search bar.
  • Type GitHub Desktop and press Enter to open it.
  • Click File in the top menu bar.
  • Click New Repository.

A dialog appears with fields to configure your new repository.

  • In the Name field, type ultrasonic-distance-meter.
  • Check the box labelled Initialize this repository with a README.
  • Leave the Local Path as the default, or change it to wherever you keep projects on your machine.
  • Click Create Repository.

What did this just do?

GitHub Desktop created a new folder called ultrasonic-distance-meter on your computer with a README.md file inside. This folder is now a Git repository, meaning Git is tracking changes to any files you add here.

Now open the repository folder so you can create the project structure inside it.

  • In GitHub Desktop, click Repository in the top menu bar.
  • Click Show in Explorer.

File Explorer opens showing the ultrasonic-distance-meter folder. You should see README.md listed inside.

Hardware projects work best with separate folders for different types of files. You'll create two folders: one for images (circuit diagrams) and one for source code.

  • Right-click in the empty space inside the ultrasonic-distance-meter folder.
  • Select New, then Folder.
  • Name the folder images and press Enter.
  • Right-click in the empty space again.
  • Select New, then Folder.
  • Name this folder src and press Enter.

Why these folder names?

The images/ folder will hold your circuit diagrams and any other visuals you embed in your README. The src/ folder (short for "source") is the standard name for code files in engineering projects.

This structure keeps your repository organized as it grows. Anyone browsing your project on GitHub will immediately know where to look for code versus documentation.

Your folder should now contain README.md, an images folder, and a src folder.

Don't see the folders you created?

Make sure you created the folders inside the ultrasonic-distance-meter folder, not inside a subfolder or outside the repository. Check the File Explorer address bar to confirm you're in the right location.

If you accidentally created them in the wrong place, delete the misplaced folders and try again from inside the correct folder.

Help me find my repository folder in File Explorer.

Place your existing Arduino code

Your distance meter code is the core of this project. Placing it in the src/ folder keeps it organized alongside your documentation.

  • Find your existing Arduino .ino file on your computer (the distance meter sketch you uploaded to your Arduino).
  • Copy the file (right-click the file, then select Copy).
  • Navigate back to the src folder inside ultrasonic-distance-meter.
  • Paste the file (right-click inside the folder, then select Paste).
  • Rename the file to distance_meter.ino by right-clicking it, selecting Rename, and typing the new name.

Why rename the file?

A descriptive, consistent filename makes your repository easier to navigate. When someone browses your project on GitHub, distance_meter.ino immediately tells them what the file does.

Switch back to GitHub Desktop. In the Changes tab on the left, you should see your new folders and the distance_meter.ino file listed as changes.

Empty folders in Git

Git does not track empty folders. The images/ folder won't appear in GitHub Desktop's changes list yet because it has no files inside. This is normal. It will show up once you add your circuit diagram in a later step.

Don't see changes in GitHub Desktop?

Make sure you placed the .ino file inside the src/ folder that lives inside your ultrasonic-distance-meter repository. Files placed outside the repository folder won't be detected by Git.

Help me check that my file is in the right place.

Your repository is structured and ready to go. Next up, you'll write the README that turns this folder into a professional project page.

Write the README in Markdown

Your repository structure is ready with dedicated folders for code and images. Now it's time to fill in the most important file: the README.

A README is the first thing visitors see when they land on your repository. You'll write yours in Markdown, a lightweight formatting language that GitHub renders automatically into headings, tables, and styled text.

In this step, get ready to:
  • Write a project title, description, and features list in Markdown.
  • Create a Hardware Components table listing every part in your circuit.
  • Document all pin connections in a Wiring table.
Open README.md and write the project overview

Every good README starts with a clear title, a short description of what the project does, and a feature list that helps readers decide if this is relevant to them.

  • In the File Explorer window showing your ultrasonic-distance-meter folder, right-click README.md.
  • Select Open with, then choose Notepad (or any text editor you prefer).
  • Select all the default content (Ctrl+A) and delete it so you have a blank file.
  • Type the following Markdown into your empty file:
# Ultrasonic Distance Meter

An Arduino-based distance measurement system using an HC-SR04 ultrasonic sensor with real-time display on a 16x2 LCD screen.

## Features

- Measures distances from 2cm to 400cm
- Real-time display on 16x2 LCD
- Simple, reproducible circuit with common components

What does this Markdown do?

  • `#` creates a level-1 heading. GitHub renders this as a large, bold title at the top of your repository page.
  • `##` creates a level-2 heading for major sections like Features.
  • Lines starting with - become bullet points in the rendered output.
  • Plain text between headings becomes paragraph text. No special syntax needed.
  • Save README.md by pressing Ctrl+S (Windows) or Cmd+S (macOS).

You won't see the Markdown rendered yet. The next section continues building this file.

File looks different from expected?

  • Make sure you deleted all the default content before typing. Leftover text will interfere with your headings.
  • Check that there is a space between # and your title text. Without the space, Markdown won't recognize it as a heading.

My README headings aren't displaying correctly. Can you help me troubleshoot?

Add the Hardware Bill of Materials table

A Bill of Materials (BOM) tells anyone replicating your project exactly what parts they need to buy. Markdown tables use pipe characters and hyphens to define columns and rows.

  • Below the Features section in README.md, add a blank line, then type the following Markdown table:
## Hardware Components

| Component | Quantity | Purpose |
| --- | --- | --- |
| Arduino Uno R3 | 1 | Microcontroller |
| HC-SR04 Ultrasonic Sensor | 1 | Distance measurement |
| 16x2 LCD Display | 1 | Output display |
| Breadboard | 1 | Circuit assembly |
| Jumper Wires | ~20 | Connections |
| 10k Ohm Potentiometer | 1 | LCD contrast adjustment |

How does the table syntax work?

Each row is a line of text with columns separated by pipe characters (|). The second row (| --- | --- | --- |) is the header separator. It tells GitHub where the column headings end and the data begins.

The columns don't need to align perfectly in your text editor. GitHub formats them neatly when it renders the page.

  • Save README.md by pressing Ctrl+S (Windows) or Cmd+S (macOS).

You won't see the table rendered yet. The next section adds your final table to this file.

Table not rendering on GitHub later?

  • Every row must have the same number of pipe characters. Count the pipes in your header row and make sure every data row matches.
  • The | --- | --- | --- | separator row is required. Without it, GitHub treats the text as plain paragraphs instead of a table.
  • Make sure there is a blank line before the ## Hardware Components heading. Headings need a blank line above them to render correctly.

My Markdown table isn't formatting correctly. Can you help me check the syntax?

Add the Pin Connections table

The Wiring table documents every physical connection in your circuit. This is the section someone would follow while holding jumper wires and looking at your Arduino.

  • Below the Hardware Components table in README.md, add a blank line, then type the following:
## Wiring

| Arduino Pin | Component | Component Pin | Function |
| --- | --- | --- | --- |
| 5V | HC-SR04 | VCC | Power |
| GND | HC-SR04 | GND | Ground |
| D7 | HC-SR04 | Trig | Trigger pulse |
| D8 | HC-SR04 | Echo | Echo return |
| 5V | LCD | VDD | Power |
| GND | LCD | VSS | Ground |
| D12 | LCD | RS | Register select |
| D11 | LCD | Enable | Enable |
| D5 | LCD | D4 | Data bit 4 |
| D4 | LCD | D5 | Data bit 5 |
| D3 | LCD | D6 | Data bit 6 |
| D2 | LCD | D7 | Data bit 7 |

> Note: Replace pin numbers above with your actual wiring. The potentiometer connects between 5V, GND, and LCD V0 (contrast) pin.

What does this table document?

Each row maps one Arduino pin to one component pin, with the signal function described. This lets someone replicate your exact circuit without guessing which wire goes where.

The > Note: line at the bottom is a Markdown blockquote. It renders as an indented, highlighted callout on GitHub. Use it to flag important disclaimers.

Customise the pin numbers

The pin assignments above match a common wiring layout. If your physical circuit uses different pins, update the table to match your actual connections. Your code in src/distance_meter.ino should be the source of truth.

  • Save README.md by pressing Ctrl+S (Windows) or Cmd+S (macOS).
  • Switch back to GitHub Desktop.
  • Click the Changes tab in the left sidebar.
  • You should see README.md listed with a yellow dot indicating it has been modified.

Do NOT commit yet. You'll add more content in the next step before committing everything together.

Don't see README.md in the Changes tab?

  • Make sure you saved the file in Notepad (Ctrl+S). GitHub Desktop only detects saved changes.
  • Confirm you are editing the README.md inside your ultrasonic-distance-meter repository folder. If you accidentally opened a different file, your changes won't appear in this repository.
  • Check that GitHub Desktop shows the correct repository in the top-left dropdown. It should say ultrasonic-distance-meter.

My changes aren't showing up in GitHub Desktop. Can you help me figure out why?

✔️ Awesome, I've got everything!

Great. Double check you've saved README.md and that GitHub Desktop shows it as modified.

ⓧ I'd like to double check the full code

Here is the complete README.md as it should look at the end of this step:

# Ultrasonic Distance Meter

An Arduino-based distance measurement system using an HC-SR04 ultrasonic sensor with real-time display on a 16x2 LCD screen.

## Features

- Measures distances from 2cm to 400cm
- Real-time display on 16x2 LCD
- Simple, reproducible circuit with common components

## Hardware Components

| Component | Quantity | Purpose |
| --- | --- | --- |
| Arduino Uno R3 | 1 | Microcontroller |
| HC-SR04 Ultrasonic Sensor | 1 | Distance measurement |
| 16x2 LCD Display | 1 | Output display |
| Breadboard | 1 | Circuit assembly |
| Jumper Wires | ~20 | Connections |
| 10k Ohm Potentiometer | 1 | LCD contrast adjustment |

## Wiring

| Arduino Pin | Component | Component Pin | Function |
| --- | --- | --- | --- |
| 5V | HC-SR04 | VCC | Power |
| GND | HC-SR04 | GND | Ground |
| D7 | HC-SR04 | Trig | Trigger pulse |
| D8 | HC-SR04 | Echo | Echo return |
| 5V | LCD | VDD | Power |
| GND | LCD | VSS | Ground |
| D12 | LCD | RS | Register select |
| D11 | LCD | Enable | Enable |
| D5 | LCD | D4 | Data bit 4 |
| D4 | LCD | D5 | Data bit 5 |
| D3 | LCD | D6 | Data bit 6 |
| D2 | LCD | D7 | Data bit 7 |

> Note: Replace pin numbers above with your actual wiring. The potentiometer connects between 5V, GND, and LCD V0 (contrast) pin.

Your README already has a project overview, a parts list, and full wiring documentation. Next up, you'll create a circuit diagram in Fritzing and embed it directly in this file.

Create and Embed the Circuit Diagram

Your README already tells readers what components they need and how to wire them. But a visual diagram makes the difference between someone spending 30 minutes decoding a table and someone wiring up the circuit in 5 minutes.

In this step, you will build a breadboard diagram in Fritzing that mirrors your physical circuit, export it as a PNG image, and embed it directly in your README using Markdown image syntax.

In this step, get ready to:
  • Build your distance meter circuit in Fritzing's breadboard view.
  • Export the diagram as a PNG image.
  • Embed the image in your README with Markdown syntax.
Build the circuit in Fritzing

Fritzing's breadboard view lets you recreate your physical circuit digitally. The result is a realistic diagram that shows exactly how your components sit on the breadboard and connect to each other.

  • Press Cmd+Space (macOS) or the Windows key (Windows) to open your search bar.
  • Type Fritzing and press Enter to open it.
  • Start a new sketch by clicking File in the menu bar, then New.
  • You will be in the Breadboard view by default. This is the view that produces the realistic diagrams you see in Arduino project documentation.

What is the Breadboard view?

Fritzing has three views: Breadboard, Schematic, and PCB. The Breadboard view shows components as they physically appear on a real breadboard, making it the most intuitive for readers who want to replicate your project.

  • Look at the Parts panel on the right side of the window. This is where you search for and select components.
  • In the search field at the bottom of the Parts panel, type Arduino Uno.
  • Drag the Arduino Uno R3 from the search results onto the canvas.
  • Search for breadboard and drag a breadboard onto the canvas below the Arduino.
  • Search for HC-SR04 and drag the ultrasonic sensor onto the breadboard.
  • Search for LCD and drag a 16x2 LCD display onto the canvas.

Can't find the HC-SR04?

The HC-SR04 may not appear in the default parts library. Visit the Fritzing forum's parts section and download the HC-SR04.fzpz file. Then drag the downloaded file directly into the Fritzing window to import it.

help me find and import the HC-SR04 part into Fritzing

  • Arrange the components on the canvas to roughly match your physical circuit layout.

Your canvas should now show an Arduino Uno, a breadboard, the HC-SR04 sensor, and a 16x2 LCD, all positioned but not yet wired together.

Wire the components

Now you will recreate every connection from your physical circuit. Use your Wiring table from Step 2 as a reference to make sure you do not miss any connections.

  • Click on a pin on one component to start a wire.
  • Click the destination pin on the other component to complete the connection.
  • Repeat for every connection in your Wiring table.
  • Use red wires for power (5V connections), black wires for ground, and other colours for signal pins.

Change wire colours

Right-click any wire to change its colour. Colour-coding your wires makes the diagram much easier to read. Match the colours to your physical circuit if possible.

  • Double-check that every row in your Wiring table has a corresponding wire in your Fritzing diagram.

Your diagram should now show a fully wired circuit with colour-coded connections matching your physical build.

Export and embed the diagram

With your diagram complete, you will export it as a PNG image and then reference it in your README so that GitHub renders it inline.

  • In Fritzing, click File in the menu bar.
  • Hover over Export, then as Image, then click PNG.
  • In the save dialog, navigate to your repository's images/ folder.
  • Name the file circuit-diagram.png and click Save.

Why save into images/?

Keeping images in a dedicated folder keeps your repository organized. When you reference the image from your README, you will use a relative path that points into this folder.

  • Switch back to your text editor where README.md is open.
  • Scroll to the bottom of the file (below the Wiring section and its note).
  • Add the Circuit Diagram section by typing the following:
## Circuit Diagram

![Circuit diagram showing Arduino Uno connected to HC-SR04 and LCD](images/circuit-diagram.png)

What does this Markdown do?

The ! at the start tells Markdown to render an image (not a clickable link). The text inside [ ] is the alt text that describes the image for accessibility. The path inside ( ) is the relative path to your PNG file.

When GitHub renders your README, it replaces this line with the actual image displayed inline.

  • Save README.md.
  • Switch back to GitHub Desktop. In the Changes tab, you should now see both README.md and the new images/circuit-diagram.png file listed.

Don't see the image file in GitHub Desktop?

Make sure you saved the PNG export directly into the images/ folder inside your repository. If you accidentally saved it elsewhere, move the file into images/ using File Explorer and check GitHub Desktop again.

help me get my Fritzing export to show up in GitHub Desktop

✔️ Awesome, I've got everything!

Great. Make sure you have saved README.md and confirmed both files appear in GitHub Desktop's Changes tab. Do not commit yet.

ⓧ I'd like to double check the full code

Here is the full README.md as it should look at the end of this step:

# Ultrasonic Distance Meter

An Arduino-based distance measurement system using an HC-SR04 ultrasonic sensor with real-time display on a 16x2 LCD screen.

## Features

- Measures distances from 2cm to 400cm
- Real-time display on 16x2 LCD
- Simple, reproducible circuit with common components

## Hardware Components

| Component | Quantity | Purpose |
| --- | --- | --- |
| Arduino Uno R3 | 1 | Microcontroller |
| HC-SR04 Ultrasonic Sensor | 1 | Distance measurement |
| 16x2 LCD Display | 1 | Output display |
| Breadboard | 1 | Circuit assembly |
| Jumper Wires | ~20 | Connections |
| 10k Ohm Potentiometer | 1 | LCD contrast adjustment |

## Wiring

| Arduino Pin | Component | Component Pin | Function |
| --- | --- | --- | --- |
| 5V | HC-SR04 | VCC | Power |
| GND | HC-SR04 | GND | Ground |
| D7 | HC-SR04 | Trig | Trigger pulse |
| D8 | HC-SR04 | Echo | Echo return |
| 5V | LCD | VDD | Power |
| GND | LCD | VSS | Ground |
| D12 | LCD | RS | Register select |
| D11 | LCD | Enable | Enable |
| D5 | LCD | D4 | Data bit 4 |
| D4 | LCD | D5 | Data bit 5 |
| D3 | LCD | D6 | Data bit 6 |
| D2 | LCD | D7 | Data bit 7 |

> Note: Replace pin numbers above with your actual wiring. The potentiometer connects between 5V, GND, and LCD V0 (contrast) pin.

## Circuit Diagram

![Circuit diagram showing Arduino Uno connected to HC-SR04 and LCD](images/circuit-diagram.png)

Your circuit diagram is now part of your documentation. Next up, you will add the Software section with installation instructions and push everything live to GitHub.

Add Software Section and Push to GitHub

Your README already shows visitors what hardware you used and how it's wired. The circuit diagram gives a visual reference too.

The next thing someone needs to replicate your project is software instructions. In this step, you'll add a Software section covering dependencies, installation steps, and usage. Then you'll commit everything and push your repository live to GitHub.

In this step, get ready to:
  • Write the Software section with dependencies, installation, and usage instructions.
  • Add a License section to your README.
  • Commit and push your repository to GitHub.
Write the Software section

The Software section tells someone exactly what tools they need and how to get your code running on their own Arduino.

  • In your text editor, open README.md and scroll to the bottom (below the Circuit Diagram section).
  • Add the Software section heading and Dependencies subsection by typing the following at the end of the file:
## Software

### Dependencies

- [Arduino IDE](https://www.arduino.cc/en/software) (2.x or later)
- LiquidCrystal library (included with Arduino IDE)

What does this code do?

The ## Software line creates a level-2 heading, and ### Dependencies creates a level-3 subheading beneath it.

The square-bracket and parentheses syntax [text](url) creates a clickable link in Markdown. Visitors can click the link to go straight to the Arduino IDE download page.

  • Below the Dependencies list, add the Installation and Usage subsections by typing:
### Installation

1. Download and install the [Arduino IDE](https://www.arduino.cc/en/software)
2. Open [distance_meter.ino](src/distance_meter.ino) in the Arduino IDE
3. Connect your Arduino Uno via USB
4. Select board: Tools > Board > Arduino Uno
5. Select port: Tools > Port > (your Arduino's COM port)
6. Click Upload

### Usage

Once uploaded, the LCD displays the measured distance in centimeters, updating continuously. Point the HC-SR04 sensor at an object to see its distance.

What's happening here?

The numbered list (1., 2., etc.) renders as an ordered list on GitHub. Each item is one step a reader follows to upload your code.

The link [distance_meter.ino](src/distance_meter.ino) is a relative link. It points to the file inside your repository so readers can click it and jump straight to your source code.

  • Save README.md.

Link not working when you preview later?

Relative links only work once the file is pushed to GitHub. The path src/distance_meter.ino must exactly match the folder and filename in your repository. Check that your .ino file is inside the src/ folder and that the filename matches what you typed.

Help me debug my relative link in the README.

Add a License section

A license tells other people how they can use your work. Without one, the default is "all rights reserved" and nobody can legally reuse your code.

  • Below the Usage paragraph in README.md, add the License section by typing:
## License

This project is licensed under the MIT License.

Why add a license?

The MIT License is one of the most permissive open-source licenses. It lets anyone use, modify, and share your project as long as they include the license notice. This is standard practice for Arduino community projects.

  • Save README.md.

Your README is now complete with all sections.

✔️ Awesome, I've got everything!

Great. Double check you've saved README.md before moving on to the commit step.

ⓧ I'd like to double check the full code

Here is the complete README.md file. Compare yours against it to make sure nothing is missing:

# Ultrasonic Distance Meter

An Arduino-based distance measurement system using an HC-SR04 ultrasonic sensor with real-time display on a 16x2 LCD screen.

## Features

- Measures distances from 2cm to 400cm
- Real-time display on 16x2 LCD
- Simple, reproducible circuit with common components

## Hardware Components

| Component | Quantity | Purpose |
| --- | --- | --- |
| Arduino Uno R3 | 1 | Microcontroller |
| HC-SR04 Ultrasonic Sensor | 1 | Distance measurement |
| 16x2 LCD Display | 1 | Output display |
| Breadboard | 1 | Circuit assembly |
| Jumper Wires | ~20 | Connections |
| 10k Ohm Potentiometer | 1 | LCD contrast adjustment |

## Wiring

| Arduino Pin | Component | Component Pin | Function |
| --- | --- | --- | --- |
| 5V | HC-SR04 | VCC | Power |
| GND | HC-SR04 | GND | Ground |
| D7 | HC-SR04 | Trig | Trigger pulse |
| D8 | HC-SR04 | Echo | Echo return |
| 5V | LCD | VDD | Power |
| GND | LCD | VSS | Ground |
| D12 | LCD | RS | Register select |
| D11 | LCD | Enable | Enable |
| D5 | LCD | D4 | Data bit 4 |
| D4 | LCD | D5 | Data bit 5 |
| D3 | LCD | D6 | Data bit 6 |
| D2 | LCD | D7 | Data bit 7 |

> Note: Replace pin numbers above with your actual wiring. The potentiometer connects between 5V, GND, and LCD V0 (contrast) pin.

## Circuit Diagram

![Circuit diagram showing Arduino Uno connected to HC-SR04 and LCD](images/circuit-diagram.png)

## Software

### Dependencies

- [Arduino IDE](https://www.arduino.cc/en/software) (2.x or later)
- LiquidCrystal library (included with Arduino IDE)

### Installation

1. Download and install the [Arduino IDE](https://www.arduino.cc/en/software)
2. Open [distance_meter.ino](src/distance_meter.ino) in the Arduino IDE
3. Connect your Arduino Uno via USB
4. Select board: Tools > Board > Arduino Uno
5. Select port: Tools > Port > (your Arduino's COM port)
6. Click Upload

### Usage

Once uploaded, the LCD displays the measured distance in centimeters, updating continuously. Point the HC-SR04 sensor at an object to see its distance.

## License

This project is licensed under the MIT License.
Commit and push to GitHub

Everything is written and saved locally. Now you'll package your changes into a commit and push them to GitHub so the world can see your documentation.

  • Switch back to GitHub Desktop.
  • In the Changes tab on the left, confirm you see README.md, your image file in images/, and your source code in src/ listed as changed files.
  • At the bottom of the changes list, find the Summary field.
  • Type the following commit message in the Summary field: Add complete project documentation with circuit diagram.
  • Click Commit to main.
  • Click Push origin in the repository bar at the top.

What is Push origin?

A commit saves your changes locally on your machine. Pushing sends those committed changes to the remote repository on GitHub so others can see them. "Origin" is the name for your remote repository on GitHub.

  • Open your browser and navigate to your repository on github.com.
  • Verify that the README renders with formatted headings, tables, the circuit diagram image, and clickable links.

README not displaying correctly?

If your tables look broken, check that every row has the same number of pipe | characters. A missing pipe in one row throws off the entire table.

If the circuit diagram image does not appear, confirm the path in your image syntax matches the actual file location. The path images/circuit-diagram.png is case-sensitive.

Help me fix my README rendering on GitHub.

Your documentation is live. Anyone can now visit your repository, understand your project, and replicate it from scratch. Next up, the Secret Mission adds technical depth that separates a basic upload from a true portfolio piece.

Secret mission

Add Technical Depth

Your documentation tells people what you built and how to replicate it. But what separates a basic upload from a professional portfolio piece is explaining how and why it works. In this secret mission, you will add a technical explanation, a schematic diagram, and a troubleshooting guide that shows you truly understand your project.

Clean Up Your Resources

Clean Up Your Resources

Decide whether to keep your resources running, pause them to come back later, or delete them entirely.

This project has no ongoing costs. Your GitHub repository is hosted for free, and Fritzing was a one-time $12 purchase already installed on your machine.

Resources you used:

  • GitHub repository ultrasonic-distance-meter (hosted on GitHub, free).
  • Local repository folder with project files (README, images, source code).
  • Fritzing software (installed locally, $12 one-time purchase).

Keep everything running

No action needed. Choose this if you plan to keep updating your documentation or want to reference it for future hardware projects.

  • Your GitHub repository stays live at no ongoing cost. Anyone with the link can view your documentation.
  • Fritzing remains installed on your machine, ready for your next hardware project (like the upcoming ESP32 project).
  • Your local repository folder stays on your machine for offline access and future edits.

Pause - I'll come back to this later

Nothing is actively running in this project, so there is nothing to pause. Your repository stays on GitHub at no cost and your local files stay on disk.

  • If you want to free up disk space, you can close Fritzing. Your saved sketch files remain in place for next time.
  • Your GitHub repository remains accessible whenever you return.

Delete - I don't want to use this again

Remove all project resources and start fresh. Follow these steps to delete everything.

  • Delete the GitHub repository: go to your repository on github.com, click the Settings tab, scroll down to the Danger Zone section, and click Delete this repository. Confirm the deletion when prompted.
  • Delete the local repository folder. Open File Explorer, navigate to where you created the ultrasonic-distance-meter folder, right-click it, and select Delete.
  • Uninstall Fritzing: open Windows Settings, go to Apps, find Fritzing in the list, and click Uninstall.

Nice Work!

Nice Work!

You just turned a working Arduino project into a professional, shareable piece of engineering documentation. Your ultrasonic distance meter repository is live on GitHub for anyone to find, learn from, and replicate.

Here's what you accomplished:

  • Wrote a complete README.md in Markdown using headings, tables, images, links, and lists to document your hardware project.
  • Built a circuit diagram in Fritzing and embedded it directly in your repository documentation.
  • Established a reusable repository template with a folder structure and README skeleton you can clone for every future hardware project.
  • Secret Mission: Added technical depth with a "How It Works" explanation, a schematic view, and a Troubleshooting guide.

Ready to quiz yourself?