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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 ==
Technical guide for the Waveshare 4-inch HDMI LCD (C) with capacitive touch, IPS panel and optical bonding. Covers hardware connection to Raspberry Pi, PC and Jetson Nano, plus software configuration steps.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL21433 WSAL21433 – 4inch HDMI Capacitive Touch IPS LCD Display (C), 720×720, Optical Bonding Screen]

== Technical overview ==
* Resolution: 720 × 720 pixels on a 4-inch IPS panel with optical bonding.
* Touch: 5-point capacitive touch with toughened glass, hardness up to 6H.
* Interfaces: HDMI for video/audio, USB or I2C for touch, 3.5 mm audio and speaker connector.
* Compatibility: Works with Raspberry Pi OS, Ubuntu, Kali and Retropie; with PC under Windows 11/10/8.1/8/7; with Jetson Nano under Ubuntu.
* Raspberry Pi hardware connection: Set the touch switch to “I2C”, mount the Pi via copper posts, connect HDMI; Pi Zero requires an additional HDMI cable.
* Software setup: Download the latest official Raspberry Pi image, format and write the TF card, then extend config.txt in the boot partition root directory.
* DTBO files: Copy the three downloaded .dtbo files into /boot/overlays/.
* PC usage: Switch the touch selector to “USB”, connect Power&Touch to a PC USB port and the display to a PC HDMI port.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
dtparam=i2c_arm=on
dtoverlay=waveshare-4dpic-3b
dtoverlay=waveshare-4dpic-4b
dtoverlay=waveshare-4dpic-5b
hdmi_force_hotplug=1
config_hdmi_boost=10
hdmi_group=2
hdmi_mode=87
hdmi_timings=720 0 100 20 100 720 0 20 8 20 0 0 0 60 0 48000000 6
start_x=0
gpu_mem=128
disable_splash=1
wget https://files.waveshare.com/upload/1/18/Evdev-right-click-emulation.zip
unzip Evdev-right-click-emulation.zip
cd evdev-right-click-emulation
sudo apt install build-essential libevdev2 libevdev-dev -y
sudo cp 'out/evdev-rce' '/usr/local/bin/'
sudo chmod +x '/usr/local/bin/evdev-rce'
sudo evdev-rce
sudo usermod -G 'input' -a pi
echo 'uinput' | sudo tee -a /etc/modules
sudo nano /etc/udev/rules.d/99-uinput.rules
KERNEL=="uinput", MODE="0660", GROUP="input"
sudo udevadm control --reload-rules
sudo udevadm trigger
sudo reboot
evdev-rce
sudo mkdir ~/.config/autostart
sudo nano ~/.config/autostart/right_click.desktop
[Desktop Entry]
Version=1.0
Type=Application
Name=evdev-rce
GenericName=Enable long-press-to-right-click gesture
Exec=env LONG_CLICK_INTERVAL=1000 LONG_CLICK_FUZZ=200 /usr/local/bin/evdev-rce
Terminal=true
StartupNotify=false
</syntaxhighlight>

== Notes and version constraints ==
* The exact DTBO file names depend on the Raspberry Pi model; select the correct overlay for your board.
* Replacing the boot logo requires filesystem access; this may be limited on some systems.
* The long-press right-click feature is stated to support only 32-bit systems by default; 64-bit is not supported.
* PWM backlight control requires removing the original soldered resistor; consult the original documentation for exact pad connections.
* The speaker connector supports 8 Ω / 5 W; higher loads may damage the amplifier.
* If other operating systems show issues, first use Raspberry Pi OS to adjust DISABLE_HDMI before switching back.
* Beware of knock-offs: purchase only from official channels, as pirated copies ship without testing or support.

== Source and revision record ==
* [https://www.waveshare.com/wiki/4inch_HDMI_LCD_(C) 4inch HDMI LCD (C) - Waveshare Wiki]
* Source revision: 111002
* Captured: 2026-09-03T02:49:07+00:00
* SHA-256: <code>5bf386d49f3a13d30333e4d7ec6ff33aad8b71779ab25e1f1b522f88e40aa54f</code>

WSAL21433 – 4inch HDMI LCD (C)/en - Versionsgeschichte

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