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Green rectangular circuit board 85x56mm with HDMI USB Ethernet GPIO and M.2 connectors

WaveShare

WaveShare CM4-IO-BASE-B barebone mini PC

SKU CH-3QEG-62V4M

Mini base board for Raspberry Pi Compute Module 4 with Gigabit Ethernet, HDMI, USB, CSI, DSI, M.2, microSD and 40-pin GPIO in an 85×56 mm form factor

  • CPU TypeOther
  • Mini IO board for CM4 evaluation
  • Standard CM4 socket with 40-pin GPIO header
  • Onboard HDMI, USB, Gigabit Ethernet, CSI, DSI, RTC, FAN, Micro SD, M.2
  • Compact 85x56 mm form factor with PoE support
  • Includes mounting screw for secure installation

Target platform

This mini base board is built for the Raspberry Pi Compute Module 4 and accepts both Lite and eMMC variants. It suits engineers evaluating the CM4 or integrators embedding the module into finished devices.

Interface limits

The board provides CSI, DSI, RTC, fan, HDMI, USB, Gigabit Ethernet, Micro SD and M.2 connectors in an 85 by 56 millimetre footprint. The DSI port links only to the CM4 DSI0 interface and the fan header drives 5 volt fans exclusively.

Critical spec

A 5 volt 2 amp supply is required for stable CM4 operation and the Type C port doubles as the power input or USB slave flashing interface. Connecting other devices while flashing can interrupt the image burn.

Highlights

  • Mini IO board for CM4 evaluation
  • Standard CM4 socket with 40-pin GPIO header
  • Onboard HDMI, USB, Gigabit Ethernet, CSI, DSI, RTC, FAN, Micro SD, M.2
  • Compact 85x56 mm form factor with PoE support
  • Includes mounting screw for secure installation

Specifications

CPU TypeOther

Questions about this item

Which Compute Module 4 versions work with this base board?

The board accepts all Compute Module 4 variants, both Lite and eMMC models, via the standard CM4 socket.

What does the Gigabit Ethernet port actually deliver in a finished build?

It provides a wired 1 Gbps network link for the Compute Module 4, limited by the module's single PCIe lane.

How does the M.2 slot limit the storage I can install?

The slot uses the CM4's single PCIe Gen 2 lane, so any M.2 drive runs at up to 5 Gbps and shares bandwidth with other PCIe devices.

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