4inch DPI LCD (B)
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Introduction
480x800, 4inch IPS Display for Raspberry Pi, DPI interface, 5-points capacitive touch control.
Features
- 4inch IPS Display, 480×800 hardware resolution.
- Designed for Raspberry Pi, based on Raspberry Pi 40pin GPIO interface.
- Using the DPI666 interface of Raspberry Pi to drive LCD, refresh rate up to 60Hz.
- Drive capacitive touch through the I2C interface of Raspberry Pi, 5-point touch, toughened glass panel, hardness up to 6H.
- Supports Raspbian and Kali systems.
- With high-fidelity speakers and 3.5mm audio output (Note: Pi4B doesn't support audio output temporarily).
- Two spin buttons, for backlight brightness and volume adjustment.
How to use
This LCD can support Raspbian and Kali systems.
Please download the latest version of the image on the Raspberry Pi official website.
1) Download the compressed file to the PC, and unzip it to get the .img file.
2) Connect the TF card to the PC, use SDFormatter.exe software to format the TF card.
3) Open the Win32DiskImager.exe software, select the system image downloaded in step 1, and click‘Write’ to write the system image.
4) After the image has finished writing, open the config.txt file in the root directory of the TF card(/boot/), add the following code at the end of config.txt, then save and quit the TF card safely.
gpio=0-9=a2 gpio=12-17=a2 gpio=20-25-=a2 dtoverlay=dpi24 enable_dpi_lcd=1 display_default_lcd=1 extra_transpose_buffer=2 dpi_group=2 dpi_mode=87 dpi_output_format=0x7f216 dpi_timings=480 0 40 48 128 800 0 13 3 15 0 0 0 60 0 41000000 6 dtoverlay=waveshare-4dpib-3b-4b dtoverlay=waveshare-4dpib-3b dtoverlay=waveshare-4dpib-4b
Note: For Raspberry Pi 4, you need to comment out dtoverlay=vc4-fkms-V3D.
5)Download the File:4DPIB DTBO.zip and extract 3 dtbo files. Copy these three files to the overlays directory (/boot/overlays/), as shown in the following figure:
6) Save and quit the TF card safely, and insert the TF card into the Raspberry Pi.
7) Insert the 4inch DPI LCD (B) into the 40PIN GPIO interface of the Raspberry Pi, power on the Raspberry Pi, and wait for about ten seconds to display normally.
Rotation (Working with Raspberry Pi)
Display Rotating
Add this statement in the config.txt file (the config file is located in the root directory of the TF card, which is named /boot):
display_rotate=1 #1：90；2: 180； 3: 270
And then restart the Raspberry Pi after saving.
sudo reboot
Touch Rotating
After the display is rotated, the position of touch is incorrect because the touch doesn’t change with the display angle. So the touch also needs to be modified.
1.Install libinput.
sudo apt-get install xserver-xorg-input-libinput
If the system you installed is Ubuntu or Jetson Nano. The installation code is:
sudo apt install xserver-xorg-input-synaptics
2.Create the xorg.conf.d directory under /etc/X11/ (if the directory already exists, proceed directly to step 3).
sudo mkdir /etc/X11/xorg.conf.d
3.Copy the 40-libinput-conf file to the directory you created just now.
sudo cp /usr/share/X11/xorg.conf.d/40-libinput.conf /etc/X11/xorg.conf.d/
4.Edit this file.
sudo nano /etc/X11/xorg.conf.d/40-libinput.conf
Find the part of the touchscreen, add the following statement inside, and then save the file.
Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"
Similar to the picture below:
5. save and reboot your Pi
sudo reboot
After completing these steps. The LCD could rotate 90 degrees both display and touch function.
Note:
90 degree: Option "CalibrationMatrix" "0 1 0 -1 0 1 0 0 1"
180 degree: Option "CalibrationMatrix" "-1 0 1 0 -1 1 0 0 1"
270 degree: Option "CalibrationMatrix" "0 -1 1 1 0 0 0 0 1"
Audio output
1.Modify /boot/config.txt
- If you are using zero/zero2w/Pi4, please add the following lines on your config.txt:
dtoverlay=audremap,pins_18_19
- If you are using Pi3B/Pi3B+, please add the following lines on your config.txt:
dtoverlay=pwm gpio=18=a5
2. Modify /etc/rc.local and add the following code before exit 0 of rc.local:
sudo raspi-gpio set 18 a5
- To test audio output, you can use the mplayer tool, please run the following code to install and use:
sudo apt-get install mplayer mplayer xxx.mp3
Note: If there is no sound, you can try the following two solutions:
1. Turn the Volume adjustment knob.
2. Check whether the audio output is normal,please run the following code:
sudo raspi-config
Choose Advanced Options -> Audio -> 1 Force 3.5mm ('headphone') jack
Knob introduction
- Backlight: Adjust the screen brightness.
- Volume: Adjust the speaker volume.
Others
Disable power saving.
If you want to keep the display turning on all the time, you can disable the power saving function.
Modify file lightdm.conf
sudo nano /etc/lightdm/lightdm.conf
Find the [SeatDefaults] option and uncomment the line"xserver-command", modify it as below:
#xserver-command=X
Modify this code to
xserver-command=X -s 0 -dpms
- -s # –Disable the display protecting.
- dpms Disable power saving.
Reboot
sudo reboot
Turn on/off HDMI output
You can use the following commands to disable/enable the displaying.
vcgencmd display_power 0 vcgencmd display_power 1
Interface
The pins labeled "NC" below means that those pins of Raspberry Pi are not occupied by the LCD, and the user can use them for other applications.
| PIN NO. | SYMBOL | DESCRIPTION |
|---|---|---|
| 1 | NC | Power positive (3.3V power input) |
| 2 | 5V | Power positive (5V power input) |
| 3 | VSYNC | Vertical sync |
| 4 | 5V | Power positive (5V power input) |
| 5 | HSYNC | Horizontal sync |
| 6 | GND | Ground |
| 7 | B0 | RGB signal cable |
| 8 | G2 | RGB signal cable |
| 9 | GND | Ground |
| 10 | G3 | RGB signal cable |
| 11 | G5 | RGB signal cable |
| 12 | AUDIO | Audio output |
| 13 | TP_INT | Touch Panel interrupt |
| 14 | GND | Ground |
| 15 | R2 | RGB signal cable |
| 16 | R3 | RGB signal cable |
| 17 | NC | Power positive (3.3V power input) |
| 18 | R4 | RGB signal cable |
| 19 | TP_SDA | I2C SDA for touch panel |
| 20 | GND | Ground |
| 21 | B5 | RGB signal cable |
| 22 | R5 | RGB signal cable |
| 23 | TP_SCL | I2C SCL for touch panel |
| 24 | B4 | RGB signal cable |
| 25 | GND | Ground |
| 26 | B3 | RGB signal cable |
| 27 | LCD_CLK | LCD clock |
| 28 | DE | LCD data enable |
| 29 | B1 | RGB signal cable |
| 30 | GND | Ground |
| 31 | B2 | RGB signal cable |
| 32 | G0 | RGB signal cable |
| 33 | G1 | RGB signal cable |
| 34 | GND | Ground |
| 35 | NC | GPIO interface |
| 36 | G4 | RGB signal cable |
| 37 | NC | GPIO interface |
| 38 | R0 | RGB signal cable |
| 39 | GND | Ground |
| 40 | R1 | RGB signal cable |
Raspberry Pi Long-press Right-click Settings
Test environment: 2022-04-04-raspios-bullseye-armhf 32-bit system
Supported models: Support Waveshare DSI LCD, DPI LCD and HDMI LCD capacitive touch screen series.
Software Installation
wget https://www.waveshare.com/w/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 cd 'evdev-right-click-emulation' sudo cp 'out/evdev-rce' '/usr/local/bin/' sudo chmod +x '/usr/local/bin/evdev-rce'
Enter the command:
sudo evdev-rce
After running, you can touch and long press to realize the right-click function.
Set IP
sudo usermod -G 'input' -a pi echo 'uinput' | sudo tee -a /etc/modules sudo nano /etc/udev/rules.d/99-uinput.rules
Add in 99-uinput.rules file.
KERNEL=="uinput", MODE="0660", GROUP="input"
save it and run it in the terminal.
sudo udevadm control --reload-rules sudo udevadm trigger
Then reboot:
sudo reboot
Run after reboot (no sudo needed at this point)
evdev-rce
After running, you can touch and long press to realize the right-click function.
Set Startup
Enter the terminal
sudo mkdir ~/.config/autostart sudo nano ~/.config/autostart/right_click.desktop
Add the following in 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 #If you want to modify the sensitivity, you can modify the size of the two parameters, LONG_CLICK_INTERVAL=1000 LONG_CLICK_FUZZ=200.
Resource
Software
FAQ
Anti-Piracy
Since the first-generation Raspberry Pi released, Waveshare has been working on designing, developing, and producing various fantastic touch LCDs for the Pi. Unfortunately, there are quite a few pirated/knock-off products in the market. They're usually some poor copies of our early hardware revisions, and comes with none support service.
To avoid becoming a victim of pirated products, please pay attention to the following features when purchasing:
Beware of knock-offs
Please note that we've found some poor copies of this item in the market. They are usually made of inferior materials and shipped without any testing.
You might be wondering if the one you're watching or you've purchased in other non-official stores is original, feel free to contact us.
Support
Technical Support
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