The layout for the SigCore UC main board is nearly finished. Most of the routing is in place, and the board is finally starting to take its final form. Here’s a look at both sides as it stands now.

Top View (Connector + Component Side)

This is the top side of the board — it faces upward inside the enclosure and contains most of the active circuitry, as well as the external signal connectors. Features include:

• Screw terminals for:

  • Relay outputs

  • Digital inputs

  • Analog inputs and outputs

  • Ground and 5V bus

• Analog signal conditioning

• Digital input protection and buffers

• Relay drivers and flyback diodes

• Voltage regulators and I2C expansion

• 40-pin header for the Raspberry Pi 4B, mounted through to the bottom

• Mounting holes for enclosure alignment and Pi support

This is the working face of the board. All external wiring enters here, and components are grouped by function to reduce interference and simplify testing. The silkscreen is designed to align with the enclosure overlay for a clean, professional look.

Bottom View (Relay, Pi, and Power Supply Side)

The bottom side of the board faces downward inside the enclosure and carries:

• Mechanical relays

• Raspberry Pi 4B, mounted upside-down beneath the board

• AC-DC power supply module

• Mounting holes for board support and standoff clearance

The Pi's USB, Ethernet, and HDMI ports are not exposed directly through the enclosure. Instead, short patch cables will connect the Pi to panel-mounted connectors. This keeps the enclosure clean while maintaining full functionality.

The AC-DC supply (5V/10A) is mounted here as well, isolated from signal circuitry and well-positioned for airflow. Clearance, thermal, and safety spacing are being carefully checked as part of the final layout pass.

What’s Left

• Complete routing of remaining analog and control lines

• Review copper weight and trace widths for power handling

• Confirm Pi port clearance and patch routing

• Finalize relay trace layout and thermal reliefs

• Add test points, label tuning, and silkscreen cleanup

• Final DRC pass and export for fabrication

This is the most complete version yet — mechanical, electrical, and layout elements are finally lining up. I’m getting close to ordering the first round of boards for assembly and bench testing.