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

2026-09-05T22:36:21Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

Neue Seite

__NOINDEX__
'''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 3.5-inch display is a resistive-touch LCD designed for the Raspberry Pi with a 480×320 resolution and an IPS panel. It connects directly to the Pi's GPIO header and supports SPI communication as well as the FBCP driver.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL12287 WSAL12287 – 3.5inch Resistive Touch Display (B) for Raspberry Pi, 480×320, IPS Screen, SPI]

== Technical overview ==
* Resolution: 480 × 320 pixels; panel type: IPS with wide viewing angles.
* Connection: the 26-pin connector on the display side mates with the Raspberry Pi's 40-pin GPIO header.
* Power inputs: 3.3 V and 5 V rails; ground via multiple GND pins.
* Touch input: resistive touch with interrupt (TP_IRQ) and its own SPI bus (TP_SI, TP_SCL, TP_CS).
* LCD SPI bus: shared with the touch panel through common signals such as LCD_SCK/TP_SCK and LCD_CS/TP_CS.
* Driver support: official drivers are available for Raspberry Pi OS, Ubuntu, Kali, and Retropie.
* Versions: older versions use a different LCD; the new Rev2.0 is identified by the silk-screen printing on the back.
* Dimensions: the new Rev2.0 panel has different dimensions than the old one; exact values refer to manufacturer documentation.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo apt-get install unzip -y
sudo apt-get install cmake -y
wget https://files.waveshare.com/wiki/common/Waveshare35b-v2.zip
unzip ./Waveshare35b-v2.zip
sudo cp waveshare35b-v2.dtbo /boot/overlays/
sudo nano /boot/firmware/config.txt
dtparam=spi=on
dtoverlay=waveshare35b-v2
hdmi_force_hotplug=1
max_usb_current=1
hdmi_group=2
hdmi_mode=87
hdmi_cvt 480 320 60 6 0 0 0
hdmi_drive=2
display_rotate=0
sudo nano ~/.bash_profile
export FRAMEBUFFER=/dev/fb1
startx 2> /tmp/xorg_errors
sudo nano /usr/share/X11/xorg.conf.d/99-fbturbo.~
Section "Device"
</syntaxhighlight>

== Notes and version constraints ==
* The calibration values in the example are illustrative; they must be adjusted individually before use.
* The driver must be downloaded and installed – without it the display will not function correctly.
* For issues with older system images: download the latest image from Waveshare or Raspberry Pi and install the current driver.
* Recommended power supply: 5 V / 2.5 A adapter; USB power may cause boot failures.
* Operating temperature range: commercial grade 0–70 °C.
* Normal operating current is approximately 150 mA.
* If the driver was installed without network access, touch may malfunction; adjust the boot file and reinstall after reconnecting.
* The auto-login process requires the username 'pi'.
* Reboots take longer after configuration; SSH availability is delayed accordingly.

== Source and revision record ==
* [https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(B) 3.5inch RPi LCD (B) - Waveshare Wiki]
* Source revision: 109425
* Captured: 2026-08-30T03:24:59+00:00
* SHA-256: <code>d73404285b0f4cbc42a7d482fdbe0a6695706b1a02adb901f1eab43a58bd3b17</code>

WSAL12287 – 3.5inch RPi LCD (B)/en - Versionsgeschichte

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