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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 4-inch display with a 480×800 IPS panel and resistive touch connects directly to a Raspberry Pi via the GPIO header. It supports Raspberry Pi OS, Ubuntu, Kali, and Retropie and can also be used as a simple monitor.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL12030 WSAL12030 – 4inch Resistive Touch Screen LCD, 480×800, HDMI, IPS, Low Power]

== Technical overview ==
* IPS panel with a resolution of 480 × 800
* Resistive touch operation
* Compatible with all Raspberry Pi generations; for Pi Zero / Zero 2 W an additional HDMI cable is required
* Supports Raspberry Pi OS, Ubuntu, Kali, and Retropie systems
* Can be used as a plain monitor without the touch function
* Backlight switchable via a switch on the back of the display
* Operating range: 0 °C to 70 °C
* Mounting hole size M3
* No I/O resources are used when only the display is used; I/Os are required for the touch function

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
hdmi_group=2
hdmi_mode=87
hdmi_timings=480 0 40 10 80 800 0 13 3 32 0 0 0 60 0 32000000 3
hdmi_drive=1
hdmi_force_hotplug=1
dtoverlay=waveshare-ads7846,penirq=25,xmin=150,xmax=3900,ymin=100,ymax=3950,speed=50000
sudo apt-get install evtest
sudo evtest
sudo nano /boot/firmware/config.txt
dtoverlay=waveshare-ads7846,x_min=164,x_max=4010,y_min=154,y_max=3758
sudo reboot
sudo nano /boot/firmware/cmdline.txt
video=HDMI-A-1:400x1280M@60,rotate=90
rotate=90
rotate=180
rotate=270
sudo nano .config/wayfire.ini
[output:HDMI-A-1]
mode = 800x480@60
transform = 270
</syntaxhighlight>

== Notes and version constraints ==
* The exact values for x_min, x_max, y_min, and y_max must be measured per device using evtest; the numbers given in the wiki are examples
* Screen rotation commands depend on the OS in use (Bookworm, Bullseye/Kali, Ubuntu); verify the correct variant before applying it
* The parameter X in “gpio -g pwm 18 X” must be between 0 and 1024; which direction (bright/dark) applies in your setup should be confirmed manually
* The SDFormatter and Win32DiskImager instructions assume a Windows PC environment; other tools may work
* Missing information regarding warranty, certifications, or prices – no data available

== Source and revision record ==
* [https://www.waveshare.com/wiki/4inch_HDMI_LCD 4inch HDMI LCD - Waveshare Wiki]
* Source revision: 106242
* Captured: 2026-08-30T03:12:03+00:00
* SHA-256: <code>ece2208eab5dc8014c84d56f1d5d83aef7c9b621f80ed4a04dcc1719e497ae61</code>

WSAL12030 – 4inch HDMI LCD/en - Versionsgeschichte

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