4 layers80.9 × 53.7 mm
KiCad Tut.1
uniqueacevedo/KiCad-Mini-Projects
A collection of small PCB design exercises created to strengthen my understanding of KiCad, circuit design, and the hardware development workflow.
17 partsMIT
2 layers75.2 × 157.5 mm
TrafficLight
uniqueacevedo/KiCad-Mini-ProjectsA collection of small PCB design exercises created to strengthen my understanding of KiCad, circuit design, and the hardware development workflow.
- Size
- 75.2 × 157.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 28
- Nets
- 56
- Pads
- 117
- Tracks, vias
- 167, 10
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Sep 2025
- Updated
- 12 Oct 2026
Overview
TrafficLight is an open-source printed circuit board by uniqueacevedo, from the uniqueacevedo/KiCad-Mini-Projects repository on GitHub, published under the MIT licence. It is a 2-layer board of 75.2 × 157.5 mm with 28 parts on 56 nets, routed with 167 tracks and 10 vias.
It is built around the 74HC595, CC56-12SRWA and PN2222A. Its parts include 16 resistors, 3 diodes, 3 transistors, 2 ICs and 1 capacitor. It belongs with the AVR (ATmega, ATtiny) boards of this library.
Main components
3
74HC595
SOP-16-40℃~+85℃ 1 100ns@5V,50pF 10MHz 2V~6V 74HC 8 Serial-to-Serial or Parallel Tri-State SOP-16 Shift Registers ROHSGRShift Registers
CC56-12SRWA
DIP-12DIP-12 LED Segment Displays ROHSKingbrightLED Segment Displays
PN2222A
TO-92-3-55℃~+150℃ 1 NPN 1A 300MHz 300mV 40V 625mW NPN TO-92-3 Bipolar (BJT) ROHSNTE ElectronicsBipolar (BJT)
README
README.md🧠 KiCad Mini Projects
This folder documents a series of small, self-directed hardware design projects created as part of my ongoing learning in PCB design, circuit analysis, and embedded systems development. Each project focuses on practicing a specific concept or workflow step — from schematic capture and component selection to layout, routing, and validation — all using KiCad.
These mini builds are my way of exploring the full hardware pipeline hands-on:
- Translating ideas into functional circuit schematics
- Designing clean, manufacturable two-layer PCBs
- Reviewing footprints, clearances, and signal paths
- Experimenting with analog and digital interfaces
- Bringing each design to life through simulation or prototyping
While each board is small in scope, the goal is consistency and growth — improving attention to detail, mastering KiCad’s toolset, and strengthening practical intuition for real-world hardware design.
More projects will be added as I continue refining both technical skill and design discipline through iteration.
Tools: KiCad • LTspice • Arduino IDE • Python
Focus Areas: PCB layout • Circuit design • Embedded hardware • Schematic-to-prototype workflow
Parts
28| Qty | Value | Footprint | References |
|---|---|---|---|
| 9 | 220 | TrafficLight_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R77, RA1, RB1, RC1, RD1, RDPX1, RE1, RF1, RG1 |
| 3 | 1000 | TrafficLight_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R3, R5 |
| 3 | 330 | TrafficLight_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R4, R6 |
| 3 | LED | TrafficLight_Footprints:LED_D5.0mm | D1, D2, D3 |
| 3 | PN2222A | TrafficLight_Footprints:TO-92_Inline | Q1, Q2, Q3 |
| 1 | 0.1 µF | TrafficLight_Footprints:C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 1 | 10k | TrafficLight_Footprints:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10 |
| 1 | 74HC595 | TrafficLight_Footprints:DIP-16_W7.62mm | U1 |
| 1 | Arduino_Nano_v3.x | TrafficLight_Footprints:Arduino_Nano_WithMountingHoles | A1 |
| 1 | Buzzer | TrafficLight_Footprints:Buzzer_12x9.5RM7.6 | BZ1 |
| 1 | CC56-12SRWA | TrafficLight_Footprints:CA56-12SRWA | U2 |
| 1 | Pedestrian Button | TrafficLight_Footprints:SW_PUSH_6mm_H5mm | SW1 |
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Questions
How big is the TrafficLight PCB?
It measures 75.2 × 157.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the TrafficLight use?
28 parts, built around the 74HC595, CC56-12SRWA and PN2222A. 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 TrafficLight KiCad files?
From the uniqueacevedo/KiCad-Mini-Projects repository on GitHub, at the commit this page was made from: the board is Traffic Light (v1)/KiCad_files/TrafficLight.kicad_pcb and its schematic SpO2 Monitor/KiCad_files/KiCad Tut.1.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the TrafficLight 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).