2 layers57 × 55.2 mm
LogicAnalyzer
gusmanb/logicanalyzer
24 channel, 100Msps logic analyzer hardware and software
10 parts5.1kGPL-3.0
2 layers24 × 23.8 mm
DummyLED
wirenux/DummyLEDThe goal of this project is to create a physical interface where:
- Size
- 24 × 23.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 10
- Nets
- 8
- Pads
- 26
- Tracks, vias
- 14, 0
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 11 May 2026
- Updated
- 11 May 2026
Overview
DummyLED is an open-source printed circuit board by wirenux, from the wirenux/DummyLED repository on GitHub, published under the MIT licence. It is a 2-layer board of 24 × 23.8 mm with 10 parts on 8 nets, routed with 14 tracks and 0 vias.
Its parts include 3 switches and 1 connector.
README
README.mdDummyLED 🔴🟢🔵
DummyLED is a beginner-friendly PCB project designed to demonstrate basic circuit logic and tactile interaction. The board features three momentary buttons, each controlling a dedicated Red, Green, or Blue LED using a 5V power rail.
Overview
The goal of this project is to create a physical interface where:
- Pressing Button 1 lights up the Red LED.
- Pressing Button 2 lights up the Green LED.
- Pressing Button 3 lights up the Blue LED.
The circuit is designed for a 5V supply, providing enough voltage "headroom" to drive Green and Blue LEDs (which typically require $>3.0\text{V}$) at full brightness.
Technical Specifications
Circuit Logic
The board uses a series configuration for each LED branch:
5V Rail -> Tactile Switch -> Current Limiting Resistor -> LED -> GND.
Resistor Calculations
To ensure consistent brightness across different colors, the following resistance values were calculated using Ohm's Law:
$$R = \frac{V_{source} - V_f}{I}$$
| Components | $V_f$ (Forward Voltage) | Resistor Value |
|---|---|---|
| Red LED | $~2.0V$ | $220Ω$ |
| Green LED | $~3.2V$ | $220Ω$ |
| Blue LED | $~3.2V$ | $150Ω$ |
Schematic & Layout
Schematic
PCB Layout
License
This project is release under MIT License.
Parts
10| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | LED | LED_THT:LED_D3.0mm_FlatTop | BLUE, GREEN, RED |
| 3 | SW_DPST_x2 | Button_Switch_THT:SW_PUSH_6mm | SW1, SW2, SW3 |
| 2 | 120Ω | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | 120Ω, 220Ω |
| 1 | 220Ω | Resistor_THT:R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | 220Ω |
| 1 | Conn_01x02 | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
Questions
How big is the DummyLED PCB?
It measures 24 × 23.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the DummyLED use?
10 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the DummyLED KiCad files?
From the wirenux/DummyLED repository on GitHub, at the commit this page was made from: the board is DummyLED.kicad_pcb and its schematic DummyLED.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the DummyLED design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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