Quelltext der Seite WSAL16784 – PI4B/en

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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 ==
Concise technical guide to the Raspberry Pi 4 Model B: SoC, RAM options, interfaces and setup via SD card.

== Related products at JW Tech ==
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== Technical overview ==
* Uses the BCM2711B0 (ARM Cortex-A72) as a 64-bit quad-core CPU at 1.5 GHz.
* Available in three RAM variants: PI4B-1GB, PI4B-2GB and PI4B-4GB.
* Interfaces include Gigabit Ethernet, USB 3.0 x 2, USB 2.0 x 2, two micro-HDMI ports (supporting 4Kp60), a MicroSD slot, a 3.5 mm audio jack, a 40-pin GPIO header, a CSI camera connector and a DSI display connector.
* Wireless: 802.11ac dual-band NIC (2.4/5 GHz) and Bluetooth 5.0/BLE.
* Power is supplied via USB Type-C at a minimum of 5 V / 3 A.
* PoE is possible through a PoE header when a compatible PoE HAT is used.
* Setup flow: format an SD card, flash the OS image, insert the card, connect the 5 V/3 A adapter; the power LED stays red and the ACT LED blinks green.
* Dual-screen touch mapping uses xinput map-to-output &lt;touch ID&gt; &lt;HDMI ID&gt;; persist it in /etc/xdg/lxsession/LXDE-pi/autostart.

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
xrandr
xinput
xinput map-to-output <touch ID> <HDMI-ID>
sudo nano /etc/xdg/lxsession/LXDE-pi/autostart
</syntaxhighlight>

== Notes and version constraints ==
* The source does not specify software versions or driver requirements; verify the latest official OS version before use.
* SD-card formatting depends on the tool used (the source mentions SDFormatter.exe); alternatives exist.
* PoE requires an additional HAT; without it the PoE header remains unused.
* For dual displays, the correct touch ID must be identified manually; if unclear which belongs to the main screen, test both IDs.
* The autostart entry must remain effective after each reboot; otherwise the command line has to be re-run.

== Source and revision record ==
* [https://www.waveshare.com/wiki/PI4B PI4B - Waveshare Wiki]
* Source revision: 104344
* Captured: 2026-08-31T03:50:53+00:00
* SHA-256: <code>716c65d5483054b9bcd12669917ad2223ccdb3fd011ecfd7069f6f2000f5e363</code>