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Raspberry Pi CM4-to-Pi4-Adapter User Guide


This is a CM4 To Pi 4B Adapter for Raspberry Pi and is an alternative solution for Raspberry Pi 4B. Onboard 4 x USB3.0 ports, Gigabit Ethernet port, PoE header, and so on.


  • Onboard standard CM4 connector, support access to CM4 Lite / eMMc series boards with Quad Core Cortex A72 64-bit processor, more powerful performance
  • Easily compatible with the interfaces of Raspberry Pi 4B board, the DISPLAY port position is inconsistent with the main board of Raspberry Pi 4B
  • Onboard 4-ch USB 3.0 ports, compatible with USB 2.0 / 1.1 transmission
  • Onboard RJ45 Gigabit Ethernet port, 10 / 100 / 1000 M adaptive
  • Onboard PoE header, for connecting PoE HATs
  • DSI interface is DSI1
  • USB Type C interface is for the power supply or can be used as the USB SLAVE interface for programming images
  • Do not connect to other devices when using the micro USB port to program the image for ensuring the power supply of CM4
  • CM4 must be provided by 5V 2A, or it will shut down, lower frequency, etc.



Compute_Module 4

Onboard Resources

1CM4 socketfor all variants of Compute Module 4
240PIN GPIO headerfor connecting to all HATs
3PoESupport access to PoE HAT
4Gigabit Ethernet portRJ45 Gigabit Ethernet port, support 10 / 100 / 1000M network access
5,6USB3.0 interface4x USB3.0 interface, support USB devices
7FAN headerConnect to the cooling fan, does not support speed regulation and speed measurement only supports 5V fan (not soldering by default)
8HDMI interface2 x Micro HDMI interface, supports 4K 30fps output
9USB Type C5V/2.5A power supply, can also be used as an eMMC programming interface
10LED indicatorIndicating the working status of the Raspberry Pi
11BOOTON:CM4 USB Type C booting guide
OFF: eMMC or SD card boot guide
12CAM interfaceMIPI CSI interface
13Micro SD card slotFor connecting to a Micro SD card with the system, only for the Lite version
14DISP1 interfaceMIPI DSI interface, DISP1 interface
15IO-VREF selectionCM4 IO logic voltage switch 3.3V or 1.8V
16Function pinRUN: CM4 running status pin
GL-EN: Power supply enable pin
17System function switchBT_DIS: Bluetooth disabled, only for CM4 with antenna
WiFi_DIS: WiFi disabled, only for CM4 with antenna
WP_DIS: EEPROM write protection


Do not plug and unplug any devices when powering on.

Image Programming

Fan Header

The default is no welding, without speed regulation and speed measurement, controlled by GPIO18 (BCM code).


Configuration File

CSI and DSI are disabled by default. When using the camera and DSI, it will occupy three I2C devices: I2C-10, I2C-11, and I2C-0.

  • Open a terminal and run the following commands:
wget https://www.waveshare.com/w/upload/7/75/CM4_dt_blob_Source.zip
 unzip -o  CM4_dt_blob_Source.zip -d ./CM4_dt_blob_Source
 sudo chmod 777 -R CM4_dt_blob_Source
 cd CM4_dt_blob_Source/
 sudo  dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp0-double_cam.dts
 #If you need to restore, please delete the corresponding dt-blob.bin: sudo rm -rf /boot/dt-blob.bin
 # After execution, turn off the power and restart the CM4

Record Test

Connect the cameras:
1: Please power off the IO Board first before connecting.
2: Connect the power adapter after connecting the cameras and DSI display.
3: Wait a few seconds before the screen boot up.
4: If the DSI LCD cannot display, please check if you have added /boot/dt-blob.bin. If there already has the dt-blob.bin, just try to reboot.

Old Version (Buster)

Run the "raspi-config" in the camera, choose Interfacing Options->Camera->Yes->Finish-Yes, reboot the system, open "enable camera", and then reboot to save the change.

  • Test the Cameras:

Test camera:

sudo raspivid -t 0 -cs 0

New Version (Bullseye)

If you are using the latest Raspberry Pi OS (Bullseye):

#Use dual cameras in the new system
#Remove "camera_auto_detect=1" in config.txt


#imx219 is the model of the camera sensor, and it also supports other sensors.

#Then reboot

#Open the camera 
libcamera-hello -t 0

#Other commands:
#Check whether the camera is detected
libcamera-hello --list-cameras

#Open the corresponding camera
libcamera-hello  --camera 0

#Take a picture
libcamera-jpeg -o test.jpg

#You can add "--camera" to specify the camera

More instructions click me.
Please refer to Raspberry Pi Manual.

Price: $25.89
Part Number: CM4-to-Pi4-Adapter
Brand: Spotpear
SKU: 0101445