Seaberry Pi CM4 Carrier Board

A Mini-ITX carrier board for the RPi Compute Module 4 with PCIe peripheral connectivity

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The Seaberry Pi is a full-featured Raspberry Pi Compute Module 4 carrier board in Mini-ITX form that exposes the PCIe bus to a variety of different connector types, which include:

  • One M.2 Key M slot for NVME SSD
  • Four PCIe Mini connectors
  • Four PCIe M.2 Key E connectors that work with Google Coral Dual Edge TPUs for AI applications
  • One x16 standard PCIe add-on card connector
  • One x1 PCIe side connector

Versatility via PCIe

The ability of Seaberry Pi to connect with commercial PCIe cards makes it a flexible tool for applications including:

  • IoT appliances
  • Industrial and home control and automation
  • Smart cameras
  • Smart audio processing engines
  • Security appliances
  • Wired and wireless routers and firewalls
  • Wireless monitoring, IDS/IPS
  • LTE and Bluetooth gateways
  • Sophisticated AI inference accelerators
  • Cloud edge computing devices
  • Raspberry Pi CM4 development platform
  • Drone compute and control hardware

Conceptual Prototype Demos

CM4 Functionality - Motherboard Format

The board is crafted as a standard Mini-ITX form-factor motherboard and supports all functionality that can be found on a Raspberry Pi CM4 IO board, including:

  • RPi HAT interface
  • Dual HDMI video interfaces
  • Dual USB 2.0 interfaces
  • MicroSD card slot
  • Micro USB connector for configuration
  • Real-time clock with external battery interface
  • PWM fan connector
  • SATA power connector
  • Display and Camera interfaces

The board also features

supports the latest 802.3bt PoE standard to allow up-to 100 W power delivery from qualified PoE power source.

Google Coral Dual Edge TPUs

What also makes this board unique is the implementation of dual PCIe lanes per each M.2 slot, allowing for the use of the newly-released Google Coral Dual Edge TPU modules* for AI acceleration.

*Please note that there are currently issues with Raspberry CM4 module and Google Coral PCIe TPU. Both Raspberry and Google are working to solve it, so we hope that by the time our campaign will come to a close, it will be resolved.


  • Form-factor: standard Mini-ITX form factor board, 170 mm x 170 mm
  • PCIe:
    • One 16-lane size vertical PCIe connector with x1 lane implementation (standard Mini-ITX location)
    • One 1-lane PCIe side port connector (to allow to plug standard x1 PCIe add-on card on a left side)
    • Four (4) PCIe Mini slots implementing x1 PCIe lane, USB 2.0, and I²C interfaces
    • Four (4) PCIe M.2 Key E slots implementing x2 (dual) PCIe lanes, USB 2.0 interfaces
    • One PCIe M.2 Key M slot to allow M.2 2280 NVME SSD implementing x1 PCIe lane
  • CM4 connectivity:
    • Connector for standard Raspberry CM4 module (Regular or Lite)
    • Pinout for standard Raspberry HAT
  • Power:
    • Two 12 V power input connectors - one internal, one external, which are mutually inclusive to support power failover
    • One RJ-45 capable of PoE 802.3bt (100 W) power input handling
    • One standard SATA power header implementing 12 V, 5 V, and GND rails
    • One PoE 4-pin header identical to CM4 I/O board and Raspberry Pi 4
    • One standard PWM fan connector
    • Two 5 V pin headers on RPi header
    • Two 3.3 V pin headers on RPi header
    • Eight GND pin headers on RPi header
  • Video: two HDMI output ports
  • USB: two USB 2.0 ports
  • Networking:
    • One network RJ-45 (also capable of PoE 802.3bt power handling)
    • One RJ-45 implementing CISCO style RS232 serial console cable
  • RPi header I/O: 40-pin classic Raspberry Pi header
    • Twenty-eight GPIO pins, including PWM, SPI, UART, I²C
    • Two 5 V outputs
    • Two 3.3 V outputs
    • Eight GND pins
    • Additional I²C bus header
  • Programming/Control: all identical to that on the CM4 I/O board
    • One MicroSD card slot to program the CM4 Lite
    • One Micro USB port to program the CM4 (not Lite) eMMC
    • 2x7 raw header for jumper-selected settings/controls
  • Real-Time Clock: with external battery interface

Open Source Information

High-resolution PDFs of the board schematics and layouts (top and bottom) will be published during or after a successful campaign.

See Also

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