Raspberry Pi Relay PCB Design

flux

0:00

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.
115 days

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LED1 K - R1 P1
LED1 K - R1 P1
J8
R1 P2 - LED1 A
R1 P1 - LED1 K
J10
LED2 K - R2 P1
ReverseDiode
J2
LED2 K - R2 P1
R1 P2 - LED1 A
R1 P2 - LED1 A
R2 P1 - LED2 K
J2 2 - C9 P2
J9
R1 P1 - LED1 K
R2 P1 - LED2 K
J2 1 - F1 1
R1 P2 - LED1 A
R2
Inductance
Inductance
D1
F1 2 - D1 Cathode
J7
J2 2 - C9 P2
LED1
Capacitance
Capacitance
F1 2 - D1 Cathode
J2 1 - F1 1
LED2
Inductance
Inductance
R1
Capacitance
Capacitance
GND
SurgeTVS
U5
Inductance
Inductance
BuckReg
Inductance
Inductance
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    Ground
    A common return path for electric current. Commonly known as ground.
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    Wirelessly connects power nets on schematic. Identical to the net portal, but with a power symbol. Used to organize schematics and separate functional blocks. To wirelessly connect power net portals, give them the same designator. #portal #power
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  • Generic Resistor
    Generic Resistor
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    A generic fixed capacitor ideal for rapid circuit topology development. You can choose between polarized and non-polarized types, its symbol and the footprint will automatically adapt based on your selection. Supported options include standard SMD sizes for ceramic capacitors (e.g., 0402, 0603, 0805), SMD sizes for aluminum electrolytic capacitors, and through-hole footprints for polarized capacitors. Save precious design time by seamlessly add more information to this part (value, footprint, etc.) as it becomes available. Standard capacitor values: 1.0pF 10pF 100pF 1000pF 0.01uF 0.1uF 1.0uF 10uF 100uF 1000uF 10,000uF 1.1pF 11pF 110pF 1100pF 1.2pF 12pF 120pF 1200pF 1.3pF 13pF 130pF 1300pF 1.5pF 15pF 150pF 1500pF 0.015uF 0.15uF 1.5uF 15uF 150uF 1500uF 1.6pF 16pF 160pF 1600pF 1.8pF 18pF 180pF 1800pF 2.0pF 20pF 200pF 2000pF 2.2pF 22pF 20pF 2200pF 0.022uF 0.22uF 2.2uF 22uF 220uF 2200uF 2.4pF 24pF 240pF 2400pF 2.7pF 27pF 270pF 2700pF 3.0pF 30pF 300pF 3000pF 3.3pF 33pF 330pF 3300pF 0.033uF 0.33uF 3.3uF 33uF 330uF 3300uF 3.6pF 36pF 360pF 3600pF 3.9pF 39pF 390pF 3900pF 4.3pF 43pF 430pF 4300pF 4.7pF 47pF 470pF 4700pF 0.047uF 0.47uF 4.7uF 47uF 470uF 4700uF 5.1pF 51pF 510pF 5100pF 5.6pF 56pF 560pF 5600pF 6.2pF 62pF 620pF 6200pF 6.8pF 68pF 680pF 6800pF 0.068uF 0.68uF 6.8uF 68uF 680uF 6800uF 7.5pF 75pF 750pF 7500pF 8.2pF 82pF 820pF 8200pF 9.1pF 91pF 910pF 9100pF #generics #CommonPartsLibrary
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  • Generic Inductor
    Generic Inductor
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  • Terminal
    Terminal
    An electrical connector acting as reusable interface to a conductor and creating a point where external circuits can be connected.
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    RMCF0805JT47K0
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  • 875105359001
    875105359001
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  • CTL1206FYW1T
    CTL1206FYW1T
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Costly Ivory Mr. Fusion thumbnail
Relay HAT Schematic – Post‑Validation Fix Plan (ULN2803A, Buck → Pico, LEDs, Optos, Testpoints)

Properties

mm
°
°
°
°
°
°
°
°
mm

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

Assets

Assets are files uploaded to this project which can be used in various ways.

Controls