Mini Base Board (C) for Raspberry Pi Compute Module 4

WaveshareSKU: WAV-23228
Sale price £21.20
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This Mini Base Board (C) for the Raspberry Pi Compute Module 4 is a compact CM4 breakout option offering a good set of features with a small footprint.

With its dedicated 40-Pin LCD connector to easily connect to a display/touch device, M.2 slot for high-performance storage, 4K HDMI, Real-time clock, dual-CSI ports to connect your cameras, and a host of other features, it's a great base for any CM4 project that you you're planning.

Including this board, there are 3 boards available! Below is a table to show the difference between the 3.

MINI BASE A 1x Y M.2 M 4x 1x 2x ×2 N 5V 5V Mini size
MINI BASE B 1x Y M.2 M 4x 1x 2x ×2 Y 5V 5V Mini size
MINI BASE C 1x Y M.2 M 2x N/A 1x ×2 Y 5V 5V Dedicated 40PIN LCD Connector

You can find the A board here and the B board here

Note: Compute Module, M.2 SSD and RTC battery not included


  • 40-Pin GPIO Header
  • 1x RJ45 Gigabit Ethernet Port
  • 2x USB 2.0 Ports
  • 1x Full Sized HDMI Port
  • 1x M.2 M Key Port (supports NVME Solid State Drives, or communication modules with a PCIE M.2 KEY-M interface)
  • 1x MicroSD Card Slot
  • 1x RTC (Real Time Clock) (Battery Not Included)
  • 2x CSI Camera Ports
  • 1x LCD Display Port
  • 1x USB-C Programming/Power Port

What's on Board

1. CM4 socket

Suitable for all variants of Compute Module 4

2. Power input/Programming

5V/2.5A power supply, or used for eMMC burning

3. LCD Port

40-PIN LCD display port, for direct connection to 70H-1024600 series display

4. FAN

For connecting the cooling fan, allows speed adjustment via IO ports


2x MIPI CSI camera ports

6. HDMI0 connector

HDMI0 Port supports 4K 30fps output

7. USB 2.0 ports

2x USB 2.0 ports, for connecting sorts of USB devices

8. Gigabit Ethernet connector

Gigabit Ethernet RJ45 connector, with 10 / 100 / 1000M network support

9. M.2 indicator

Indicating the operating status of M.2 interface

10. Raspberry Pi indicators

Green LED: PWR, indicating the status of Raspberry Pi power supply

Red LED: ACT, indicating the operating status of Raspberry Pi

11. Boot switch

ON: CM4 would be booted from the USB-C interface

OFF: CM4 would be booted from eMMC or TF card

12. 40PIN GPIO header

For connecting sorts of HAT

13. TF card slot

For connecting a TF card with a pre-burnt image (Lite variant ONLY)

14. FE1.1S

USB HUB chip, support expanding USB port

15. M.2 slot

Supports sorts of NVME Solid State Drives, or communication modules with PCIE M.2 KEY-M interface

16. RTC chip

Allows RTC-related functions like wakeup, shutdown, reboot, and more

17. RTC interrupt selection

GN-EN: CM4 shutdown(by default) on RTC interruption

PI-RUN: CM4 reboot on RTC interruption

D4: D4 pin is triggered on RTC interruption

18. RTC battery holder

Supports CR1220 button cell


CM4 Socket Suitable for all variants of Compute Module 4
Networking Gigabit Ethernet RJ45 connector
Connector M.2 M KEY, supports communication modules or NVME Solid State Drives
Raspberry Pi 40PIN GPIO header
USB USB 2.0 Type A × 2
Display LCD port (40pin 0.5mm FPC connector)
Camera MIPI CSI-2 camera port × 2 (15pin 1.0mm FPC connector)
Video HDMI port, supports 4K 30fps output
RTC Real-time clock with battery socket and ability to wake Compute Module 4
Storage TF card socket for Compute Module 4 Lite (without eMMC) variants
Fan Header Allows speed adjustment, 5V
Power Input 5V
Dimensions 85 x 56mm


Package Contents

  • 1x Mini Base Board (C)
  • 1x Solid State Drives mounting screw

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