One of the best tools for designing your own custom PCBs (Printed Circuit Boards) is KiCad. Whether you’re a maker, engineer, student, or creative technologist, KiCad gives you everything you need for an LED badge project.
Why KiCad?
1. It’s Free and Open Source
No licensing fees. No feature restrictions. You get professional-grade PCB tools at zero cost.
2. It’s Production-Ready
KiCad generates standard Gerber files that manufacturers like PCBWay or OSH Park accept directly.
3. Allows for Creative PCB Art
KiCad makes it easy to:
- Create custom board shapes
- Add silkscreen graphics
- Use copper layers creatively
- Design aesthetic layouts
4. Strong Community + Documentation
There are tons of tutorials, libraries, and shared projects available online.
Pick Your Components
An LED badge is essentially a small PCB that includes:
- LEDs (often surface-mount)
- Resistors
- Power source (coin cell battery is common)
- Optional microcontroller for programming led animations
- Switch or button
Badges can be:
- Static (simple on/off LEDs)
- Blinking (using 555 timers or transistor circuits)
- Programmable (using microcontrollers like ATtiny or ESP32)
For badges and any small PCBs you might consider using surface mount (SMD) components since they are compact and allow for tighter layouts. If you are just getting started and do not have the setup for soldering SMD packages, there are plenty of through-hole (THT) options that will work great.
- 0603 or 0805 SMD or 1/4 watt or 1/8 watt THT resistors
- 1206 or 0805 SMD or 3mm THT LEDs
- CR2032 coin cell holder
- Small slide switch
Step-By-Step Design Guide
Let’s walk through a simple example: a coin-cell powered badge with switch and led
Step 1: Create a New Project
Open KiCad and create a new project. Were going to use Schematic Editor for wiring logic and the PCB Editor for layout and board design.
Step 2: Design the Schematic
In the Schematic Editor:
Add Components:
- LED
- Resistor
- CR2032 coin cell holder
- Slide switch
Basic LED Circuit:
Battery (+) → Resistor → LED → Battery (–)
LEDs need a current-limiting resistor.
For 3v coin cell battery, a typical resistor value would be 100Ω – 330Ω (depending on desired brightness)
Use KiCad’s symbol library to add components, then wire them together logically.
After wiring:
- Run Electrical Rules Check (ERC)
- Annotate components
- Assign footprints
Step 3: Choose Footprints
Footprints define the physical size and pad layout.
Step 4: Design the PCB Layout
Now switch to PCB Editor.
This is where the fun begins.
1. Define the Board Shape
Instead of a boring rectangle, use:
- A logo outline
- A name shape
- A mascot silhouette
- Geometric patterns
Use the Edge.Cuts layer to draw custom shapes.
For example:
- Circular badge
- Shield shape
- Lightning bolt
- Pixel art outline
This is where LED badges become wearable art.
2. Place Components Strategically
Arrange LEDs visually:
- In a grid
- In a pattern
- As eyes in a character
- As letters
Keep in mind:
- Short traces = cleaner routing
- Symmetry improves aesthetics
- Battery placement affects balance when worn
3. Route the Traces
Use:
- Top copper layer (most common)
- Bottom copper if needed
Keep traces:
- Clean and organized
- Wide enough for current (0.25mm is usually fine for LED projects)
- Not overlapping unnecessarily
Run Design Rules Check (DRC) before exporting.
Step 5: Add Silkscreen Graphics
This is what makes badges stand out.
You can:
- Add your name
- Add logos
- Add decorative outlines
- Label components creatively
Use the F.SilkS layer for visible graphics.
For even more creativity:
- Use copper fills as decorative elements
- Expose copper intentionally
- Add patterns using filled zones
Step 6: Generate Manufacturing Files
When ready:
- Plot Gerber files
- Generate drill files
- Zip everything
Upload to your PCB manufacturer.
Most boards arrive within 1–2 weeks.
Final Thoughts
KiCad lowers the barrier to entry for hardware creativity. Designing LED badges isn’t just about wiring LEDs — it’s about merging engineering with visual design.
If you’re getting into PCB design, LED badges are one of the most rewarding first projects you can build.
They’re wearable proof that you can turn ideas into physical technology.
