2 layers126 × 92.5 mm
2 layers107.5 × 82.5 mm
Traffic Light Controller
Seth-Andrei/KiCad_Traffic_Light_Controller_guide- Size
- 107.5 × 82.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 66
- Nets
- 63
- Pads
- 180
- Tracks, vias
- 443, 20
- Pours
- 224
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 21 Apr 2026
- Updated
- 4 May 2026
Overview
Traffic Light Controller is an open-source printed circuit board by Seth-Andrei, from the Seth-Andrei/KiCad_Traffic_Light_Controller_guide repository on GitHub, published under the MIT licence. It is a 2-layer board of 107.5 × 82.5 mm with 66 parts on 63 nets, routed with 443 tracks and 20 vias.
It is built around the SM420561N, LM1117DT-3.3 and 1N4148W. Its parts include 32 resistors, 13 diodes, 5 capacitors, 4 connectors and 3 ICs.
Main components
3
SM420561N
插件-20℃~+80℃ 0.56 1 12.6mm 19mm 25mcd 2V 50mW 7 Segment 8mm Common Cathode Red 插件 LED Segment Displays ROHSARKLEDLED Segment Displays
LM1117DT-3.3
TO-2520℃~+125℃@(Tj) 1 1.2V@(800mA) 15V 3.3V 5mA 75dB@(120Hz) 800mA Fixed Over Current Protection、Over Temperature Protection、Short Circuit Protection Positive TO-252 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
1N4148W
SOD-123150mA 1A 1V@50mA 1uA@75V 400mW 4ns 75V Independent SOD-123 Switching Diodes ROHSSTMicroelectronicsSwitching Diodes
README
README.mdKiCad_Traffic_Light_Controller_guide
Parts
66| Qty | Value | Footprint | References |
|---|---|---|---|
| 26 | 130R | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23 +10 |
| 6 | 47k | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R27, R28, R29, R30, R31, R32 |
| 4 | MountingHole | MountingHole:MountingHole_2.2mm_M2 | H1, H2, H3, H4 |
| 3 | 0.22u | Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder | C2, C3, C5 |
| 3 | 1N4148W | Diode_SMD:D_SOD-123 | D11, D12, D13 |
| 2 | Conn_02x08_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x08_P2.54mm_Vertical | J1, J2 |
| 2 | SM420561N | Display_7Segment:7SegmentLED_LTS6760_LTS6780 | U1, U2 |
| 1 | +5V | my_footprints:Terminal_Block_5mm | J4 |
| 1 | 100u | Capacitor_SMD:CP_Elec_6.3x5.8 | C4 |
| 1 | 10u | Capacitor_SMD:CP_Elec_4x5.3 | C1 |
| 1 | Conn_02x05_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x05_P2.54mm_Vertical | J3 |
| 1 | EN | my_footprints:slide_switch_2.54mm | SW3 |
| 1 | EWC_GRN | LED_THT:LED_D5.0mm | D4 |
| 1 | EWC_RED | LED_THT:LED_D5.0mm | D6 |
| 1 | EWC_YLW | LED_THT:LED_D5.0mm | D5 |
| 1 | EWP_GRN | LED_THT:LED_D5.0mm | D9 |
| 1 | EWP_RED | LED_THT:LED_D5.0mm | D10 |
| 1 | LM1117DT-3.3 | Package_TO_SOT_SMD:SOT-223 | U3 |
| 1 | LOGO | my_footprints:pepe_logo | G*** |
| 1 | NSC_GRN | LED_THT:LED_D5.0mm | D1 |
| 1 | NSC_RED | LED_THT:LED_D5.0mm | D3 |
| 1 | NSC_YLW | LED_THT:LED_D5.0mm | D2 |
| 1 | NSP_GRN | LED_THT:LED_D5.0mm | D7 |
| 1 | NSP_RED | LED_THT:LED_D5.0mm | D8 |
| 1 | OVR | my_footprints:slide_switch_2.54mm | SW2 |
| 1 | RST | my_footprints:tact_switch_5mm | SW1 |
The 65 most common of 66 parts.
Questions
How big is the Traffic Light Controller PCB?
It measures 107.5 × 82.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Traffic Light Controller use?
66 parts, built around the SM420561N, LM1117DT-3.3 and 1N4148W. 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 Traffic Light Controller KiCad files?
From the Seth-Andrei/KiCad_Traffic_Light_Controller_guide repository on GitHub, at the commit this page was made from: the board is Light Controller/Traffic Light Controller.kicad_pcb and its schematic Light Controller/Traffic Light Controller.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Traffic Light Controller 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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