2 layers327.9 × 139 mm
Coco2
baldengineer/bit-preserve
Project for capturing vintage, classic, aka old computer schematics in KiCad.
147 parts446
2 layers25.4 × 59.4 mm
Roullete PCB
Rohan317685/Traffic-Light-PCBThis is a PCB that's meant to mimic a traffic light! I made it because I thought it was cool and I wanted to learn more about timing and RC circuits!
- Size
- 25.4 × 59.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 13
- Nets
- 12
- Pads
- 38
- Tracks, vias
- 68, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 4 Apr 2026
- Updated
- 26 Jun 2026
Overview
Roullete PCB is an open-source printed circuit board by Rohan317685, from the Rohan317685/Traffic-Light-PCB repository on GitHub, published under the MIT licence. It is a 2-layer board of 25.4 × 59.4 mm with 13 parts on 12 nets, routed with 68 tracks and 0 vias.
It is built around the NE555P. Its parts include 5 resistors, 3 diodes, 2 capacitors, 2 ICs and 1 connector.
Main components
1README
README.mdtraffic Light PCB
This is a PCB that's meant to mimic a traffic light! I made it because I thought it was cool and I wanted to learn more about timing and RC circuits!
Please keep in mind you need around 1% precise capacitors, resistors etc for exact accurate timing but normal parts do just fine: it may be off my 200-300 Milliseconds!
It uses RC timing and 2 Ne555p chip's that use Astable mode, this causes the led's to switch on and of just like a traffic light!
Schematic
PCB
This is for #resolution-hardware in hackclub which you should definitely join! :D
Parts
13| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 100uf | Capacitor_THT:CP_Radial_D5.0mm_P2.00mm | C1, C2 |
| 2 | 330 | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3 |
| 2 | NE555P | Package_DIP:DIP-8_W7.62mm | U1, U2 |
| 1 | 100K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 1 | 220R | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R4 |
| 1 | 47K | Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R5 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | LED Green | LED_THT:LED_D5.0mm | D3 |
| 1 | LED Red | LED_THT:LED_D5.0mm | D1 |
| 1 | LED Yellow | LED_THT:LED_D5.0mm | D2 |
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Questions
How big is the Roullete PCB PCB?
It measures 25.4 × 59.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Roullete PCB use?
13 parts, built around the NE555P. 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 Roullete PCB KiCad files?
From the Rohan317685/Traffic-Light-PCB repository on GitHub, at the commit this page was made from: the board is src/Roullete PCB.kicad_pcb and its schematic src/Roullete PCB.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Roullete PCB 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).