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Raspberry Pi Relay PCB Design

flux

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Work completed:
  • Board outline set to 50 mm × 80 mm
  • Mounting holes MH1–MH4 configured at correct diameter and positions
  • “Orientation Checklist” project property added for relays K1–K4 and terminal blocks J3–J6
  • PCB stackup set to Standard 4 Layer, with Layer 2 = GND plane and Layer 3 = 5 V plane
Tasks not yet done:
  • Verify and update the Pico header footprint (J1) to match Raspberry Pi Pico mechanical specs (requires manual edit)
  • Define and apply net classes for:
    • 12 V power nets (PROTECTED_12V, VIN_AFTER_FUSE, U5:VIN, F1, SurgeTVS, coils)
    • 5 V power nets (U5:VOUT, Pico VSYS/VBUS)
    • LED_PWR nets (LED1–LED4)
    • GPIO nets through PC817 to ULN2803A
  • Component placement (PC817 → ULN2803A → SRD-12VDC-SL-C → J3–J6 & BATx_COM)
  • Placement of 12 V entry (J2), fuse F1, protection diodes/TVS, buck converter U5 & decoupling caps C9–C12
  • Test point (TP1–TP7) placement and silkscreen labeling
  • Routing of power (12 V, 5 V) and signal nets, with wide traces, clearance rules
  • Ground stitching vias around U5 region
  • ERC/DRC run and resolution of any violations
  • Final silkscreen review and test-point labels
Success criteria status
  • ✅ Board outline and mounting holes correct (50 × 80 mm, MH1–MH4)
  • ✅ 4-layer stack configured with L2=GND, L3=5 V
  • ⬜ Pico header footprint not yet verified
  • ⬜ Net classes not defined or applied
  • ⬜ Component placement and routing incomplete
  • ⬜ ERC/DRC has not been run
Next step: Proceed to Component Placement (step 3), arranging opto-isolators (PC817), ULN2803A, relays, terminals, then place the 12 V entry and buck converter region.
148 days
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    Costly Ivory Mr. Fusion thumbnail
    Relay HAT Schematic – Post‑Validation Fix Plan (ULN2803A, Buck → Pico, LEDs, Optos, Testpoints)

    Properties

    V
    mm
    °
    °
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    °
    °
    °
    mm
    Diagram
    


  
    
  
  
    
  



Power


Control


Relays


Outputs


Indicators









































12V Input
Reverse-Polarity Protection
5V Regulator
Raspberry Pi Pico VSYS/VBUS
ULN2803A Vcc
Relay Coils Vcc
Pico GPIO Header
Opto-Isolators (Optional)
ULN2803A Low-Side Driver
Relay 1 Coil
Relay 2 Coil
Relay 3 Coil
Relay 4 Coil
"Terminal Block 1 (COM/NO/NC)"
"Terminal Block 2 (COM/NO/NC)"
"Terminal Block 3 (COM/NO/NC)"
"Terminal Block 4 (COM/NO/NC)"
LED1 + R1
LED2 + R2
LED3 + R3
LED4 + R4

    Pricing & Availability

    Distributor

    Qty 1

    Arrow

    $14.70–$73.17

    Digi-Key

    $18.01–$172.22

    LCSC

    $24.44–$26.24

    Mouser

    $18.79–$23.02

    TME

    $6.82

    Verical

    $7.39–$30.11

    Controls

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