Tracffic-Lights
About the Tracffic-Lights PCB
Tracffic-Lights is an open source PCB design by Ch3ema, published on GitHub. It is a 2-layer board measuring 19.5 × 30 mm, with 7 components from 3 distinct parts.
By type, the board carries 3 diodes, 3 resistors and 1 connector.
It belongs with the dev boards & breakouts designs in this gallery.
From the project
Arduino traffic light simulator, breadboard prototype to custom KiCad PCB
An Arduino-controlled traffic light, built on a breadboard and then turned into a custom PCB in KiCad.
Three LEDs cycle through a standard traffic light sequence.
- Arduino Uno R3 - 3x 5 mm THT LEDs (red, yellow, green) - 3x 220 Ω current-limiting resistors - 1x 4-pin male header (GND + 3 signals)
Each LED anode connects to its Arduino pin through a 220 Ω resistor; all cathodes share a common ground. That gives roughly 14 mA per LED, well under the Uno's 20 mA per-pin limit.
Tracffic-Lights bill of materials (BOM)
7 components, 3 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Conn_01x04_Pin | PinHeader_1x04_P2.54mm_Horizontal | J1 |
| 3 | LED | LED_D3.0mm | D1, D2, D3 |
| 3 | 220 | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1, R2, R3 |
Tracffic-Lights design files
The KiCad project lives in the Ch3ema/Tracffic-Lights repository on GitHub; these links point at the commit this page was built from.
- LayoutKiCad/TrafficLights.kicad_pcb
- SchematicKiCad/TrafficLights.kicad_sch
Tracffic-Lights: common questions
How big is the Tracffic-Lights PCB?
The Tracffic-Lights measures 19.5 × 30 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Tracffic-Lights?
7 components, from 3 distinct parts. The full bill of materials is listed on this page.
Where can I download the Tracffic-Lights design files?
From the Ch3ema/Tracffic-Lights repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Tracffic-Lights design in my own project?
The repository has no license, so all rights stay with Ch3ema. Use it as a reference, and ask the author before reusing the design.
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