TrafficLight
About the TrafficLight PCB
TrafficLight is an open source PCB design by uniqueacevedo, published on GitHub under the MIT license. It is a 2-layer board measuring 75.2 × 157.5 mm, with 27 components from 12 distinct parts.
Other key parts include the 74HC595 and CC56-12SRWA. By type, the board carries 8 resistors, 3 transistors, 3 diodes, 2 ICs, 1 buzzer and 1 switch.
From the project
A collection of small PCB design exercises created to strengthen my understanding of KiCad, circuit design, and the hardware development workflow.
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 -…
Main components on the TrafficLight
TrafficLight bill of materials (BOM)
27 components, 12 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HC595 | DIP-16_W7.62mm | U1 |
| 1 | CC56-12SRWA | CA56-12SRWA | U2 |
| 3 | PN2222A | TO-92_Inline | Q1, Q2, Q3 |
| 1 | Buzzer | Buzzer_12x9.5RM7.6 | BZ1 |
| 8 | 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | RA1, RB1, RC1, RD1, RDPX1, RE1, RF1, RG1 |
| 1 | Pedestrian Button | SW_PUSH_6mm_H5mm | SW1 |
| 3 | LED | LED_D5.0mm | D1, D2, D3 |
| 1 | 0.1 µF | C_Disc_D5.0mm_W2.5mm_P2.50mm | C1 |
| 3 | 1000 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1, R3, R5 |
| 3 | 330 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R4, R6 |
| 1 | 10K 10k | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R10 |
| 1 | 220 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R77 |
TrafficLight design files
The KiCad project lives in the uniqueacevedo/KiCad-Mini-Projects repository on GitHub; these links point at the commit this page was built from.
TrafficLight: common questions
How big is the TrafficLight PCB?
The TrafficLight measures 75.2 × 157.5 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the TrafficLight?
27 components, from 12 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the TrafficLight design files?
From the uniqueacevedo/KiCad-Mini-Projects repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the TrafficLight design in my own project?
Yes, under the terms of its MIT license, which uniqueacevedo chose for the repository.
