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2026-09-06T06:05:33Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''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 ==
* [https://shop.jw-tech.eu/p/WSAL21726 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:'''
<syntaxhighlight lang="text">
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
</syntaxhighlight>

== 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 ==
* [https://www.waveshare.com/wiki/CM4-NANO-B CM4-NANO-B - Waveshare Wiki]
* Source revision: 104309
* Captured: 2026-09-03T03:22:37+00:00
* SHA-256: <code>4e6e63d6861b59aedc64d7cb40d506a36619b447bc5d4887de258834811a3604</code>

WSAL21726 – CM4-NANO-B/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex