PCB Design for Railway Safety System

flux

0:03

Work done
  • Audited the existing layout and schematic context for the STM32 railway crossing controller, including the power path around PS1, U2, D1, SW1, K1, Q1, and the connector set J1, U3, U4, J2 to J10.
  • Retrieved layout/manufacturability guidance and validated that the project is already on a 4-layer stackup, which is appropriate for maintaining a continuous ground reference and separating noisy vs sensitive sections.
  • Ran layout review checks and confirmed the current PCB has major existing layout integrity problems: 80 airwires, 67 overlapping copper errors, and 58 floating copper errors.
Success criteria review
  • ❌ Improved ground-plane continuity and star-ground implementation could not be completed because the available write tools in this session do not support direct component movement, trace rerouting, fill editing, or copper-zone restructuring.
  • ❌ Zoning separation for power, MCU, relay, and connector regions could not be physically applied for the same reason.
  • ❌ Power-path widening and routing cleanup for 12 V, 5 V, and relay current paths could not be completed because there is no tool here to edit existing traces or placement directly.
  • ❌ Connector alignment and decoupling placement refinement could not be physically executed.
  • ✅ The design was thoroughly inspected, and the main blockers to a reliable prototype layout were identified.
Next steps The layout needs direct PCB editing actions that are not available in this run. If you want, I can still help by producing a precise manual rework checklist for PS1, U2, U1, K1, and the connector rows so you can apply the fixes quickly in the editor.
Review layout now
Add mounting holes
Check decoupling placement
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Documents

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    Assets

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    RAKSHAK Railway Crossing Safety System

    RAKSHAK Railway Crossing Safety System thumbnail
    STM32F401 Blackpill-style railway crossing safety controller with dual 12V input selection, LM2596 5V buck, AMS1117-3.3 MCU rail, horn relay driver, and edge-mounted off-board sensor, servo, and UART connectors for modular prototyping.

    Properties

    Properties describe core aspects of the project.

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $0.47–$3.28

    Digi-Key

    $5.46–$10.42

    LCSC

    $3.26–$4.52

    Mouser

    $3.39–$6.10

    TME

    $0.11–$0.81

    Verical

    $1.18–$10.90

    Controls