Quelltext der Seite WSAL21915 – 3.5inch HDMI LCD (E)/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 ==
Technical overview of the 3.5-inch HDMI display with capacitive touch and audio output for Raspberry Pi, PC, Jetson Nano, and Tinker Board 2.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL21915 WSAL21915 – 3.5inch HDMI Capacitive Touch IPS LCD Display (E), 640×480, Audio jack]

== Technical overview ==
* 3.5-inch IPS panel with fixed resolution of 640 × 480 pixels
* Five-point capacitive touch with tempered glass, hardness up to 6H
* Touch connection selectable via rear switch: USB or I2C
* Audio transmission via built-in 3.5 mm audio jack and HDMI audio output
* Compatibility: Raspberry Pi OS/Ubuntu/Kali/RetroPie; Tinker Board 2 with Android/Debian; Jetson Nano with Ubuntu; PC with Windows 11/10/8.1/8/7
* Raspberry Pi: manual resolution settings in config.txt required, otherwise display errors may occur
* Display refresh rate is 60 Hz
* Speaker connector: 4-PIN P2.0, pinout * + - - + *, amplifier supports 8 Ω / 5 W

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
hdmi_group=2
hdmi_mode=87
hdmi_cvt 640 480 75 6 0 0 0
hdmi_drive=2
dtparam=i2c_arm=on
dtoverlay=waveshare-35dpi-3b
dtoverlay=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
KERNEL=="uinput", MODE="0660", GROUP="input"
sudo udevadm control --reload-rules
sudo udevadm trigger
sudo reboot
evdev-rce
sudo mkdir ~/.config/autostart
Exec=env LONG_CLICK_INTERVAL=1000 LONG_CLICK_FUZZ=200 /usr/local/bin/evdev-rce
disable_splash=1
sudo -E rpi-eeprom-config --edit
</syntaxhighlight>

== Notes and version constraints ==
* Manual resolution settings for Raspberry Pi are version-dependent; for other systems, the setting must first be made via Raspberry Pi OS
* PWM backlight adjustment requires a physical board modification (rotating or moving a resistor); after modification, an external PWM signal controls brightness
* The long-press right-click feature is supported by default only on 32-bit systems, not on 64-bit
* Automatic screen-off behavior depends on the operating system; Raspberry Pi OS hibernates after about ten minutes of inactivity
* For display issues on Raspberry Pi 4B, the HDMI setting must be adjusted via official Raspberry Pi OS before using other systems

== Source and revision record ==
* [https://www.waveshare.com/wiki/3.5inch_HDMI_LCD_(E) 3.5inch HDMI LCD (E) - Waveshare Wiki]
* Source revision: 111071
* Captured: 2026-09-03T03:26:12+00:00
* SHA-256: <code>4dc68f60cc762404a982ce4cee93326ca3f6fac49982d544a989e9fd23f24a86</code>