BarnacleBoy
ef9a7f40a8
- Mechanical HDMI A/B switch for internal/external display toggle - DisplayLink rejected: no ARM drivers exist - 10-port layout split across 4 surfaces - Port side: 4x USB-A, 1x USB-C data, 1x USB-C PD out - Starboard: Ethernet, HDMI out, 3.5mm audio - Bow: USB-C power input + fan exhaust - Stern: handle, SD reader, Kensington lock - Updated BOM with HDMI switch, panel-mount cables, SD reader - Cost estimate now ~58
59 lines
2.1 KiB
Markdown
59 lines
2.1 KiB
Markdown
# Port Layout
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## Overview
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10 accessible ports + SD reader + Kensington lock, split across four case surfaces.
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## Port Side (Left, Facing Bow)
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Data connections. "Plug and unplug frequently" zone.
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| Port | Count | Source | Notes |
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|------|-------|--------|-------|
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| USB-A 3.0 | 4 | Powered hub | Flash drives, peripherals, keyboard, hardware |
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| USB-C (data) | 1 | Powered hub | Modern peripherals, data transfer |
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| USB-C PD out | 1 | IP5389 board | Phone charging, 5V/??W |
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## Starboard Side (Right, Facing Bow)
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Networking + AV. "Plug in and leave" zone.
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| Port | Count | Source | Notes |
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|------|-------|--------|-------|
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| Ethernet RJ45 | 1 | OPi5 native | Gigabit, panel-mount extension |
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| HDMI out | 1 | HDMI A/B switch | External display, switched from internal screen |
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| 3.5mm audio out | 1 | OPi5 native | Headphones, speakers, line-out |
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## Bow Wall (Back Edge, Spine Side)
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Power and cooling. No data ports.
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| Feature | Notes |
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|---------|-------|
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| USB-C power input | For IP5389 board charging |
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| Fan exhaust grilles | Blowing away from user |
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## Stern Edge (Front Edge, Lip)
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User-facing. Clean for typing.
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| Feature | Notes |
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|---------|-------|
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| Carry handle | Stern-mounted per design decision |
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| SD card reader | Panel-mount, for camera cards / quick imaging |
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| Kensington lock slot | Physical security |
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## Internal Components
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| Component | Connection |
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|-----------|------------|
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| Powered USB hub (10-port) | Decased, wired internally. Feeds all USB-A and USB-C data ports. |
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| HDMI A/B switch (mechanical) | Passive toggle. OPi5 HDMI in, two outputs (internal controller + starboard panel jack). |
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| eDP-to-HDMI controller | Connected to A/B switch output A. Drives internal display. |
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## Constraints
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- OPi5 has **one HDMI output**. The A/B switch selects internal or external — not both simultaneously.
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- DisplayLink USB graphics adapters **do not work on ARM Linux** (no drivers). Not a viable path for dual display.
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- Dual simultaneous display would require a different SBC (OPi5 Plus has 2× HDMI) or x86 board.
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- USB-C on the OPi5 is power-only in this build (consumed by IP5389 board). All USB data goes through the powered hub.
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