WSAL21726 – CM4-NANO-B/en

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare CM4-NANO-B is a compact base board for the Raspberry Pi Compute Module 4 (CM4). It exposes the module's main interfaces while staying close to the CM4 footprint, and provides an RJ45 Gigabit Ethernet port, a USB 2.0 header, CSI/DSI camera connectors, a mini HDMI output, and a 3.5 mm audio jack.

Related products at JW Tech

WSAL21726 – Nano Base Board (B) for Raspberry Pi Compute Module 4, Same Size as the CM4

Technical overview

The board is designed as a baseboard that exposes the CM4's interfaces without significantly exceeding the module's compact dimensions.
It includes an RJ45 Gigabit Ethernet port supporting 10/100/1000 Mbit/s access.
A USB 2.0 header is present; the port is disabled by default to save power and must be enabled via config.txt.
CSI and DSI connectors are also disabled by default and require loading a device-tree overlay, which may occupy I2C buses.
The mini HDMI output supports 4K at 30 fps.
A 3.5 mm audio jack is integrated; audio is controlled via GPIO and requires configuration in config.txt.
A micro SD card slot is provided only for the Lite version of the CM4.
A user button is connected to GPIO21 and pulled up to GPIO_VREF through R16 (10 kΩ); when idle, GPIO21 is high, and pressing pulls it low.
A DC buck circuit powers DSI, CSI, and GPIO with 3.3 V.
A BOOT switch controls whether the download mode over USB-C is entered on power-on (ON) or the system starts from eMMC or SD card (OFF).

Commands and examples – verify before use:

dtoverlay=dwc2,dr_mode=host
sudo apt-get install p7zip-full -y
wget https://files.waveshare.com/upload/4/41/CM4_dt_blob.7z
7z x CM4_dt_blob.7z -O./CM4_dt_blob
sudo chmod 777 -R CM4_dt_blob
cd CM4_dt_blob/
sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts
sudo nano /boot/config.txt
dtoverlay=imx219,cam0
libcamera-hello --list-cameras
libcamera-hello -t
libcamera-jpeg -o test.jpg
libcamera-vid -t 10000 -o test.h264
raspistill -o image.jpg
raspivid -o video.h264 -t 10000
dtparam=audio=on
dtoverlay=audremap,pins_18_19
sudo reboot

Notes and version constraints

Do not hot-plug any devices except USB and HDMI.
The module has no protection circuitry; avoid short-circuiting the power supply.
Normal operation of the CM4 requires 5 V / 2 A; otherwise issues such as automatic shutdown or clock throttling may occur.
USB, CSI, DSI, and audio are disabled by default and must be explicitly enabled.
When programming via USB-C, do not connect other devices to ensure stable power.
When using two cameras and DSI1, compiling the appropriate device-tree overlay is recommended; this may cause HDMI1 to stop outputting video.
The exact pinout of the 3.5 mm audio jack is not fully described in the source and may need verification against the datasheet.
Ethernet_SYNC_IN/OUT are not brought out on the CM4-NANO-B.
If the camera model you use is not listed in the table, the correct dtoverlay line must be determined individually.

Source and revision record

CM4-NANO-B - Waveshare Wiki
Source revision: 104309
Captured: 2026-09-03T03:22:37+00:00
SHA-256: 4e6e63d6861b59aedc64d7cb40d506a36619b447bc5d4887de258834811a3604