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Linux SBC · SBC
Milk-V Duo
A tiny RISC-V Linux board in the Raspberry Pi Pico footprint, able to run Linux on one core and an RTOS on the other, popular for cheap RISC-V experimentation.
Processor
CVITEK CV1800B dual RISC-V C906 (1 GHz + 700 MHz)
Logic
3.3 V GPIO
Power
5 V USB-C
Format
Pico-sized 21 x 51 mm module
Check before wiring
- Footprint matches the Pico but the pin functions do not; never reuse Pico wiring diagrams.
- Default images mux many pins for camera/RTOS use; check the duo pinmux docs before assuming GPIO.
- 3.3 V logic only, and total 3.3 V rail current is limited.
Interfaces
GPIOI2CSPIUARTADCPWMUSBCSI
Source-backed connector
Interactive pin map
Pin map
Connector
40 castellated edge pins
USB at top, component side up, headers on both long edges
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- GPIO uses 3.3 V logic; VBUS and VSYS are power rails.
- Pins 34 and 35 are not connected on the original 64 MB Duo.
- Peripheral functions depend on the active Linux pin-mux and can conflict with the camera, Ethernet, or SD-card setup.
All 40 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | GPIO | |||
| 2 | GPIO | |||
| 3 | Ground | GND | ||
| 4 | GPIO | |||
| 5 | GPIO | |||
| 6 | GPIO | |||
| 7 | GPIO | |||
| 8 | Ground | GND | ||
| 9 | GPIO | |||
| 10 | GPIO | |||
| 11 | GPIO | |||
| 12 | GPIO | |||
| 13 | Ground | GND | ||
| 14 | GPIO | |||
| 15 | GPIO | |||
| 16 | GPIO | |||
| 17 | GPIO | |||
| 18 | Ground | GND | ||
| 19 | GPIO | |||
| 20 | GPIO | |||
| 21 | GPIO | |||
| 22 | GPIO | |||
| 23 | Ground | GND | ||
| 24 | GPIO | |||
| 25 | GPIO | |||
| 26 | GPIO | |||
| 27 | GPIO | |||
| 28 | Ground | GND | ||
| 29 | GPIO | |||
| 30 | System | |||
| 31 | GPIO | |||
| 32 | GPIO | |||
| 33 | Ground | GND | ||
| 34 | Reserved | |||
| 35 | Reserved | |||
| 36 | Power | 3V3 | ||
| 37 | System | |||
| 38 | Ground | GND | ||
| 39 | Power | VSYS | ||
| 40 | Power | VBUS |
Why it matters
- Boots mainline-derived Linux from microSD on a $5-class board.
- Official docs include the full pinout and SDK.
- Camera connector for the onboard ISP.
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