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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.<br />
<br />
== Summary ==<br />
The Waveshare CM4-to-Pi4-Adapter allows a Raspberry Pi Compute Module 4 (CM4) to be used on a board base that replicates the interfaces of the Raspberry Pi 4B. It provides four USB 3.0 ports, a Gigabit Ethernet port, a PoE header, and various other connectors for cameras and displays.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL23508 WSAL23508 – CM4 To Pi 4B Adapter for Raspberry Pi, Alternative Solution for Raspberry Pi 4B, CM4 optional]<br />
* [https://shop.jw-tech.eu/p/WSAL23611 WSAL23611 – CM4 To Pi 4B Adapter for Raspberry Pi, Alternative Solution for Raspberry Pi 4B, CM4 optional]<br />
* [https://shop.jw-tech.eu/p/WSAL23613 WSAL23613 – CM4 To Pi 4B Adapter for Raspberry Pi, Alternative Solution for Raspberry Pi 4B, CM4 optional]<br />
* [https://shop.jw-tech.eu/p/WSAL23614 WSAL23614 – CM4 To Pi 4B Adapter for Raspberry Pi, Alternative Solution for Raspberry Pi 4B, CM4 optional]<br />
* [https://shop.jw-tech.eu/p/WSAL23630 WSAL23630 – CM4 To Pi 4B Adapter for Raspberry Pi, Alternative Solution for Raspberry Pi 4B, CM4 optional]<br />
* [https://shop.jw-tech.eu/p/WSAL23631 WSAL23631 – CM4 To Pi 4B Adapter for Raspberry Pi, Alternative Solution for Raspberry Pi 4B, CM4 optional]<br />
<br />
== Technical overview ==<br />
* Standard CM4 socket supporting all Compute Module 4 variants<br />
* Four USB 3.0 ports with backward compatibility to USB 2.0/1.1<br />
* RJ45 Gigabit Ethernet port with 10/100/1000 Mbps auto-negotiation<br />
* PoE header for connecting compatible PoE HATs<br />
* Two micro HDMI outputs with 4K@30 fps capability<br />
* USB Type-C port for 5 V/2.5 A power supply or as an eMMC programming interface<br />
* MIPI CSI camera connector and MIPI DSI display connector (DISP1)<br />
* 40-pin GPIO header for HAT connections<br />
* IO-VREF switch to select CM4 IO logic voltage between 3.3 V and 1.8 V<br />
* System function switches for BT_DIS, WiFi_DIS, and WP_DIS<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
wget https://files.waveshare.com/upload/7/75/CM4_dt_blob_Source.zip<br />
unzip -o CM4_dt_blob_Source.zip -d ./CM4_dt_blob_Source<br />
sudo chmod 777 -R CM4_dt_blob_Source<br />
cd CM4_dt_blob_Source/<br />
sudo dtc -I dts -O dtb -o /boot/dt-blob.bin dt-blob-disp1-double_cam.dts<br />
sudo rm -rf /boot/dt-blob.bin<br />
raspi-config<br />
sudo raspivid -t 0 -cs 0<br />
libcamera-hello -t 0<br />
libcamera-hello --list-cameras<br />
libcamera-hello --camera 0<br />
libcamera-jpeg -o test.jpg<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The DISPLAY port layout differs from the Raspberry Pi 4B mainboard; compatibility with most Pi 4 cases is limited.<br />
* When programming via the micro USB port, no other devices may be connected to ensure CM4 power supply.<br />
* The CM4 must be powered at 5 V/2 A, otherwise it may shut down or lower its clock frequency.<br />
* Do not plug or unplug any devices while powering on.<br />
* The fan header only supports 5 V fans without speed regulation or measurement; it is not soldered by default.<br />
* CSI and DSI interfaces are disabled by default; using them occupies three I2C devices: I2C-10, I2C-11, and I2C-0.<br />
* Camera and display configuration depends on the OS version (Buster vs. Bullseye); steps require manual confirmation.<br />
* Power off the IO board before connecting cameras or DSI displays; reconnect power only after connections are made.<br />
* If /boot/dt-blob.bin already exists, simply rebooting may resolve DSI display issues.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/CM4-to-Pi4-Adapter CM4-to-Pi4-Adapter - Waveshare Wiki]<br />
* Source revision: 101428<br />
* Captured: 2026-09-04T03:04:23+00:00<br />
* SHA-256: <code>ca97c415a7010e7ade9a02a755bc75731a9c273df9924a5ca9c045039f1b0971</code></div>JWTechPublisher