BarnacleBoy
e53c928e44
- eDP direct connection ruled out: undocumented pinouts, voltage mismatch risk, community consensus favors controller boards - MIPI DSI ruled out: 2-lane 15-pin, can't dual-display with HDMI on Linux, and the salvaged panel is eDP - Chosen path: HDMI -> eDP-to-HDMI controller board -> salvaged panel - Mechanical HDMI A/B switch retained as fallback for external display
61 lines
No EOL
2.4 KiB
Markdown
61 lines
No EOL
2.4 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. Built-in WiFi+BT eliminates need for USB dongles.
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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, 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 | OPi3B native | Gigabit, panel-mount extension |
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| HDMI out | 1 | HDMI A/B switch | External display, switched from internal |
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| 3.5mm audio out | 1 | OPi3B 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 (5V/3A) |
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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. OPi3B HDMI in, two outputs (internal display + 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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- OPi3B has **one HDMI output**. The A/B switch selects internal or external — not both simultaneously.
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- The internal display uses an eDP-to-HDMI controller board (matched to the salvaged panel). The native eDP port on the OPi3B is unused — direct connection was investigated but ruled out due to undocumented pinouts and voltage mismatch risk.
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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 dual-HDMI SBC.
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- Built-in WiFi 5 + BT 5.0 on the OPi3B — no USB dongles needed for wireless connectivity.
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- Two native USB 3.0 ports available for direct connections (keyboard, mouse) without hub contention. |