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WSAL12287 – 3.5inch RPi LCD (B)/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

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.

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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:  

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"

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

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