cyberdeck/docs/usb-expansion.md

USB Port Expansion

Goal: Multiple USB ports for cyberdeck peripherals

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Native Ports (Orange Pi 3B)

Port	Type	Speed	Location
USB 3.0 ×2	Type-A	5 Gbps	Board edge
USB 2.0 ×2	Type-A	480 Mbps	Board edge
USB-C	Power only (5V input)	—	Power input

Total native USB: 4 ports (2× USB 3.0, 2× USB 2.0)

Still may benefit from a hub depending on peripheral count, but the OPi3B's 2× USB 3.0 natively doubles the bandwidth available vs the OPi5.

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USB Hub Solution

Why Powered Hub

Hub Type	Power Source	Issues
Bus-powered	Draws from OPi5	Voltage drops, instability
Self-powered	External 5V supply	Stable, reliable

Orange Pi 5 USB power budget: ~900mA total across all ports.

Device power draw:

Device	Draw
USB SSD	500-1000mA
WiFi dongle	200-500mA
Keyboard	50-100mA
Mouse	50-100mA
Webcam	250-500mA

Conclusion: Bus-powered hub will cause brownouts. Use powered hub.

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Hub Options

Consumer-Grade

Model	Ports	Power	Cost
Sabrent 7-Port USB 3.0	4× 3.0 + 3× 2.0	Barrel jack	$20-25
Anker 7-Port USB 3.0	7× 3.0	Barrel jack	$25-30
Anker 4-Port USB 3.0	4× 3.0	Barrel jack	$15-20

Industrial

Model	Ports	Power	Cost
USB Hub PCB (GL850G)	4× 2.0	External 5V	$8-12
Industrial USB 3.0 Hub	4-7× 3.0	External 5V	$15-30

Recommendation

Sabrent 7-Port USB 3.0 Powered Hub

• 4× USB 3.0 + 3× USB 2.0
• External 5V barrel jack
• Vertical orientation (compact)
• ~$20-25

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Connection Diagram

                    ┌─────────────────┐
                    │  Orange Pi 3B   │
                    │                 │
                    │  USB 3.0 ───────┼─────┐
                    │  USB 3.0 ───────┼──┐  │
                    │  USB 2.0 ───────┼──┼──┤
                    │  USB 2.0 ───────┼──┼──┤
                    │                 │  │  │
                    └─────────────────┘  │  │
                                         │  │
                    ┌────────────────────┘  │
                    │                       │
                    ▼                       │
         ┌─────────────────────┐           │
         │  Powered USB Hub    │           │
         │  (7-port)           │           │
         │                     │           │
         │  [Uplink] ◀────────┘           │
         │                     │           │
         │  [1] [2] [3] [4]    │           │
         │  [5] [6] [7]        │           │
         │                     │           │
         │  ┌─────────┐        │           │
         │  │ 5V DC   │◄───────┼───────────┼── external power
         │  └─────────┘        │           │
         └─────────────────────┘           │
                    │                      │
                    ▼                      │
         ┌─────────────────────┐           │
         │  Peripherals        │           │
         │  • SSD enclosure    │           │
         │  • Keyboard         │           │
         │  • Mouse            │           │
         │  • Misc USB         │           │
         └─────────────────────┘           │
                                           │
         Native ports still available:    │
         • 2× USB 3.0 (if not used for uplink) ◄┘
         • 2× USB 2.0 (keyboard, mouse) ◄─┘

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Port Allocation

After Hub

Port	Location	Purpose	Speed
Hub Port 1	Hub	USB SSD	5 Gbps
Hub Port 2	Hub	Data transfer	5 Gbps
Hub Port 3	Hub	Data transfer	5 Gbps
Hub Port 4	Hub	Data transfer	5 Gbps
Hub Port 5	Hub	Misc peripheral	480 Mbps
Hub Port 6	Hub	Misc peripheral	480 Mbps
Hub Port 7	Hub	Misc peripheral	480 Mbps
Native USB 3.0	OPi3B	Keyboard	5 Gbps
Native USB 3.0	OPi3B	Mouse	5 Gbps
Native USB 2.0	OPi3B	BT dongle or spare	480 Mbps
Native USB 2.0	OPi3B	Spare	480 Mbps

Total available: 11 ports (7 from hub + 4 native)

Estimated Usage for Cyberdeck

• 1× USB SSD (data storage)
• 1× Keyboard (native USB 3.0 or 2.0)
• 1× Mouse (native USB 3.0 or 2.0)
• 4× Expansion ports (hub)

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Panel-Mount Options

For a permanent cyberdeck build, mount USB ports on the case face.

Method 1: Panel-Mount Cables

Pre-made cables with panel-mount USB-A connectors:

• Panel mount USB-A extension (~$10-15 for 4-pack)
• Panel mount USB-C (~$10-15 for 2-pack)

Setup:

1. Mount connectors in case face
2. Run cables inside to hub
3. Secure hub internally

Method 2: Industrial Hub PCB

Bare hub PCB designed for integration:

• Mount PCB inside case
• Wire panel connectors directly to PCB
• Cleaner internal layout

Parts:

• USB hub PCB (GL850G or similar): $8-15
• Panel-mount USB connectors: $10-15
• Meanwell 5V 3A PSU: $8

Total: ~$25-35

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Power Considerations

Hub Power Requirements

Specification	Value
Input voltage	5V DC
Current	2-4A (depending on devices)
Connector	Barrel jack (usually)

Powering the Hub

Method	Notes
Wall adapter (included)	Simple, separate power brick
5V from cyberdeck PSU	Integrated, requires 5V rail
USB-C PD	Requires USB-C hub with PD pass-through

Power Budget

Component	Draw
Orange Pi 3B (8GB)	3-5W
USB hub (self-powered)	1-2W
USB SSD	2-4W
Peripherals	1-2W
Total	7-13W

For portable build: 10,000-20,000 mAh battery pack with PD output.

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GPIO Alternative

USB hubs do not require GPIO.

GPIO (26-pin header) is for:

• Serial console (TX/RX)
• I2C devices (sensors, displays)
• SPI devices (LCD, flash)
• PWM (fan speed, servos)
• Digital I/O (buttons, LEDs)

If you want internal hub without USB cable:

• Use GPIO for power only (5V/GND)
• Still need USB data connection

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Cost Summary

Item	Cost
Powered USB 3.0 hub (7-port)	$15-25
Panel-mount cables (optional)	$10-20
Total	$15-45

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Recommended First Iteration

1. Buy Sabrent 7-port powered hub ($20)
2. Plug into Orange Pi 3B USB 3.0 port
3. Use external power adapter
4. Done — no custom wiring needed, and with 2x native USB 3.0, you have options for direct connections

When you're ready for permanent build:

• Removehub from plastic case
• Mount PCB inside cyberdeck
• Wire panel-mount connectors
• Power from internal 5V rail