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Caution

  1. This LCD display supports Raspbian, Ubuntu MATE, Snappy Ubuntu Core, OSMC, and Windows 10 IOT Core and so on. Please download your system image from raspberry Pi official website: https://www.raspberrypi.org/downloads/
  2. Please make sure that your TF card (Micro SD) has enough space to write system image
  3. Do not even touch your raspberry pi board when power is on or your hand has static charge (you can move static charge by touching metal tap)

Introduction

The 3.5″ LCD display is an LCD display which connects to the Raspberry Pi through the DSI connector. It is capacitive touch LCD. It is a plug-and-play device which doesn’t need install driver. The physical resolution of this LCD display is 800*480.

Feature

  1. Use DSI interface to connect Raspberry Pi board;
  2. The refresh frequency is 60HZ;
  3. Physical resolution is 800*480, 24-bit color. Support adjusted resolution from 800×480 to 1920×1080
  4. Size 12.1*7.63cm;
  5. 5 finger capacitive touch (but Raspbian only support 1 finger);
  6. Viewing angle: Top – 50 Bottom – 70 Left – 70 Right – 70
  7. Plug and play. No driver needed.
  8. Support system Raspbian, Ubuntu MATE, Snappy Ubuntu Core, OSMC, Windows 10 IOT Core and so on;
  9. Strong anti-interference;
  10. Ultra-low power, ultra-long distance lossless transmission,
  11. Automatically sleep;
  12. Working temperature -5° C to 38° C . Not suggest to work in high humid or extreme temperature environment.

Using guide

Parts Needed

You will need the following parts:

How to install DSI cable?

How to install OS?

3.5″ DSI LCD supports IMG system such as Raspbian, Ubuntu MATE, Snappy Ubuntu Core, OSMC, and Windows 10 IOT Core and so on. Please follow as below:

Firstly, Download IMG system in your computer from the raspberry pi official website： https://www.raspberrypi.org/downloads/

Secondly, Unzip the IMG system, and open your imager writer (recommend win32diskimager from: https://sourceforge.net/projects/win32diskimager/);

Thirdly, Insert the SD card into the card reader, and connect with computer, and select the image system and the device, and then click “write”, as below:

Fourthly, Insert the SD card into raspberry pi board and assemble 3.5″ DSI touch screen as below:

At last, Power up wait for the system to start (Note: Do not even touch your raspberry pi board when power is on or your hand has static charge):

How to add a virtual keyboard on to the screen?

The touch screen can be used as a mouse device. When we need to input text data to Raspberry Pi board, normally we have to connect a USB keyboard to Pi and this is really inconvenient.

Is there any solution which can use the touch screen itself to work as a text input device same as mobile phone?
The answer is Yes. You can install a virtual keyboard to replace the USB keyboard.

Here are the instructions:
Step 1) Install matchbox-keyboard by typing following commands in your pi terminal:

sudo apt update

sudo apt upgrade

sudo apt install matchbox-keyboard

Step 2) Click RaspberryPi icon in the top-left corner as following:

Step 3) Click Accessories->Keyboard as following:

You will see a pop-up virtual keyboard as following:

If you have want more detail about matchbox-keyboard installation, read this link:
https://osoyoo.com/2019/04/09/osoyoo-7inch-hdmi-touchscreen-keyboard-matchbox-keyboard/

Advanced course

How to adjust virtual resolution:

The physical resolution is 800*480, but you can adjust the resolution form 800×480 to 1920×1080. Open micro SD card which you have installed IMG system and then open “/boot/config.txt” via Notepad++, and find the following lines:

If you like 1920*1080, you can adjust it as below and save this file:

framebuffer_width=1920
framebuffer_height=1080

Note: If you use Raspberry Pi 4, you also need to comment the lines in “/boot/config.txt” : #dtoverlay=cv4-fkms-V3D. as following:

How to adjust rotation of display:

LCD displays have an optimum viewing angle, and depending on how the screen is mounted it may be necessary to change the orientation of the display to give the best results. By default, the Raspberry Pi display and Raspberry Pi are set up to work best when viewed from slightly above, for example on a desktop. If viewing from below, you can physically rotate the display, and then tell the system software to compensate by running the screen upside down.

To flip the display, add, anywhere in the file \boot\config.txt, the following two lines:

display_rotate=2
lcd_rotate=2

This will vertically flip the LCD and the touch screen, compensating for the physical orientation of the display

rotate=0 means Normal

rotate=1 means 90 degrees clockwise rotation

rotate=2 means 180 degrees clockwise rotation

rotate=3 means 270 degrees clockwise rotation

rotate=0x10000 means horizontal flip

rotate=0x20000 means vertical flip

How to adjust the brightness:

The following operations are based on Raspbian

(1) Run the following command in terminal to switch user permission as administrator

sudo su root

(2) Run the follwing command to adjust brightness of display (change the number 100 to any number from 0 to 255)

echo 100 > /sys/class/backlight/rpi_backlight/brightness

Note: If failing to adjust the brightness, please check the line “disable_touchscreen=1 ” in /boot/config.txt and comment it out “#disable_touchscreen=1 #”

For more config, please click https://elinux.org/RPiconfig to learn more

Learn how to set virtual keyboard (based on Raspbian), please click https://osoyoo.com/2019/04/09/osoyoo-7inch-hdmi-touchscreen-keyboard-matchbox-keyboard/

3.5″ DSI screen datasheet download link:
https://osoyoo.com/driver/dsi_screen/DSI-screen-2019018400-datasheet.pdf