3.5inch RPi LCD (B)
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Overview
Introduction
3.5 inch Touch Screen TFT LCD Designed for Raspberry Pi
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Features
- The hardware resolution is 480 × 320.
- Resistive touch control.
- It is compatible and can be directly inserted into any version of Raspberry Pi.
- Provide drivers (works with your own Raspbian/Ubuntu/Kali and Retropie system directly).
- IPS screen, large viewing angle, excellent display effect.
- Support FBCP software driver, which can set the software resolution and dual-screen display.
- As big as your raspberry pi.
- Immersion gold process, fine carving.
Version Update
- As the LCD used in the 3.5-inch RPi LCD (B) has gone out of production, we update the 3.5-inch RPi LCD (B) to Rev2.0.
- The dimension of the LCD is different, and the driver is updated as well. (Please download the new driver if you have the new version).
- You can recognize new and old versions by the silk screen printing on the backside. The new version has screen printing Rev2.0.
- The dimension of the LCD is as below, the left one is the new version. (download and open it if it is unclear on Wiki.)
Getting Started
Hardware Connection
- There are 40 pins on Raspberry Pi, but there are 26 pins on the LCD, so you should pay attention to connecting the pins to your Pi accordingly.
Touch Driver Installation
The RPi LCD can be driven in two ways:
Method 1. Install the driver to your Raspbian/Ubuntu Mate/Kali and Retropie OS.
Method 2. Use the Ready-to-use image file of which the LCD driver was pre-installed.
Method 1. Driver installation
Please download the bullseye 32bit version of the image on the Raspberry Pi official website. (Raspbian/Ubuntu Mate/Kali or Retropie)
1) Download the compressed image file to the PC, and unzip it to get the .img file.
2) Connect the TF card to the PC, open the Win32DiskImager software, select the system image downloaded in step 1, and click 'Write' to write the system image. ( How to write an image to a micro SD card for your Pi? See RPi Image Installation Guides for more details)
3) Connect the TF card to the Raspberry Pi, and start the Raspberry Pi. The LCD will display after booting up, and then log in to the Raspberry Pi terminal,(You may need to connect a keyboard and HDMI LCD to Pi for driver installation, or log in remotely with SSH.)
4) Then open the terminal of Raspberry Pi to install the touch driver.
git clone https://github.com/waveshare/LCD-show.git cd LCD-show/
Note: The Raspberry Pi must be connected to the network, or else the touch driver won't be successfully installed.
#if old version, use this command: chmod +x LCD35B-show ./LCD35B-show
#if new version, use this command: chmod +x LCD35B-show-V2 ./LCD35B-show-V2
The touch function will work after restart. For ease of use, you can set the screen orientation, see: #Screen orientation settings.
Notes:
- 1. Executing apt-get upgrade will cause the LCD to fail to work properly. In this case, you need to edit the config.txt file in the SD card and delete this sentence: dtoverlay=ads7846.
- 2. Using Raspbian-lite, the command of the touch driver installation should be:
#if old version, use this command: ./LCD35B-show lite
#if new version, use this command: ./LCD35B-show-V2 lite
For bullseye 64bit and Bookworm systems, manual configuration is required as follows: 3.5inch RPi LCD (B) Manual Configuration.
Method 2. Using Ready-to-use image
The image file with the pre-installed driver is located in the IMAGE directory of the CD, or you can download it from #Image. Extract the .7z file and you will get an .img file. Write the image to your micro SD card (How to write an image to a micro SD card for your Pi? See RPi Image Installation Guides for more details). Then insert the card into your Pi, power up, and enjoy it.
Screen Orientation Settings
After installing the touch driver, you can modify the screen rotation direction by running the following commands.
cd LCD-show/ #X can be 0, 90, 180, and 270. Indicates that the LCD rotates 0 degrees, 90 degrees, 180 degrees, and 270 degrees, respectively. sudo ./LCD35B-show X
The rotation command under Raspbian-lite is as follows:
cd LCD-show/ #X can be 0, 90, 180, and 270. Indicates that the LCD rotates 0 degrees, 90 degrees, 180 degrees, and 270 degrees, respectively. sudo ./LCD35B-show lite X
Touch screen calibration
This LCD can be calibrated through the xinput-calibrator demo. Note: The Raspberry Pi must be connected to the network, or else the program won't be successfully installed.
- Run the following command to install:
sudo apt-get install xinput-calibrator
- Click the "Menu" button on the taskbar, and choose "Preference" -> "Calibrate Touchscreen".
- Finish the touch calibration following the prompts. Maybe rebooting is required to make calibration active.
- You can create a 99-calibration.conf file to save the touch parameters (not necessary if the file exists).
sudo nano /etc/X11/xorg.conf.d/99-calibration.conf
- Save the touch parameters (may differ depending on LCD) to 99-calibration.conf, as shown in the picture:
Control Backlight Brightness with GPIO
Use a 0R resistor or solder to connect this pad.
Execute the following command on the Raspberry Pi terminal to control the backlight brightness:
gpio -g pwm 18 1024 gpio -g mode 18 pwm (the occupied pins are PWM pins) gpio pwmc 1000 gpio -g pwm 18 X (control brightness, the X value is between 0~1024)
Install Virtual Keyboard
1. Install matchbox-keyboard.
sudo apt-get install update sudo apt-get install matchbox-keyboard sudo nano /usr/bin/toggle-matchbox-keyboard.sh
2. Copy the statements below to toggle-matchbox-keyboard.sh and save.
#!/bin/bash #This script toggle the virtual keyboard PID=`pidof matchbox-keyboard` if [ ! -e $PID ]; then killall matchbox-keyboard else matchbox-keyboard -s 50 extended& fi
3. Execute the commands:
sudo chmod +x /usr/bin/toggle-matchbox-keyboard.sh sudo mkdir /usr/local/share/applications sudo nano /usr/local/share/applications/toggle-matchbox-keyboard.desktop
4. Copy the statements to toggle-matchbox-keyboard.desktop and save.
[Desktop Entry] Name=Toggle Matchbox Keyboard Comment=Toggle Matchbox Keyboard` Exec=toggle-matchbox-keyboard.sh Type=Application Icon=matchbox-keyboard.png Categories=Panel;Utility;MB X-MB-INPUT-MECHANSIM=True
5. Execute commands as below. Note that you need to use "Pi " user permission instead of root to execute this command.
sudo nano /etc/xdg/lxpanel/LXDE-pi/panels/panel
6. Find the statement that is similar to below: (It may be different in different versions.)
Plugin {
type = launchbar
Config {
Button {
id=lxde-screenlock.desktop
}
Button {
id=lxde-logout.desktop
}
}
7. Append these statements to add a button option:
Button {
id=/usr/local/share/applications/toggle-matchbox-keyboard.desktop
}
8. Reboot your Raspberry Pi. If the virtual keyboard is installed correctly, you can find that there is a keyboard icon on the left of the bar.
sudo reboot
Interface definition
The pins marked as "NC" below indicate that the pins are not occupied by the LCD and can be used by the user for other applications.
| Pin Number | Identification | Description |
|---|---|---|
| 1 | 3.3V | Power (3.3V input) |
| 2 | 5V | Power (5V input) |
| 3 | NC | NC |
| 4 | 5V | Power (5V input) |
| 5 | NC | NC |
| 6 | GND | Ground |
| 7 | NC | NC |
| 8 | NC | NC |
| 9 | GND | Ground |
| 10 | NC | NC |
| 11 | TP_IRQ | The touch panel is interrupted, and it is low when it is detected that the touch panel is pressed |
| 12 | NC | NC |
| 13 | NC | NC |
| 14 | GND | Ground |
| 15 | NC | NC |
| 16 | NC | NC |
| 17 | 3.3V | Power (3.3V input) |
| 18 | LCD_RS | Command/Data Register Select |
| 19 | LCD_SI / TP_SI | LCD display / SPI data input of touch panel |
| 20 | GND | Ground |
| 21 | TP_SO | SPI data output of touch panel |
| 22 | RST | Reset |
| 23 | LCD_SCK / TP_SCK | SPI clock signal for LCD display / touch panel |
| 24 | LCD_CS | LCD chip select signal, low level selects LCD |
| 25 | GND | Ground |
| 26 | TP_CS | Touch panel chip select signal, low level selects touch panel |
Resource
User Manual
Image
Description: if you felt hard to install the driver, try the image with the driver pre-installed.
- Image for old version
- Bullseye Image for V2
- RPi LCD Bookworm_32bit only for pi5&pi4
- RPi LCD Bookworm_32bit Applicable to non-pi5 versions
- RPi LCD Bookworm_64bit For all versions
Driver
The driver can be downloaded from github
git clone https://github.com/waveshare/LCD-show.git
Software
LCD Panel Dimension
FAQ
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Since the Raspberry Pi image and version are frequently updated, if you encounter a situation where the LCD cannot be used normally, please download the latest version of the image provided by us or from the official website of Raspberry Pi and install the latest driver provided by us.
- Make sure the hardware connection is correct and the contact is good.
- Make sure that TF card programming is normal.
- When the Raspberry Pi starts normally, the PWR light is always on, and the ACT light is flashing. If it is found that both lights are always on, it may be that the TF card is not successfully programmed to the image or the TF card is in poor contact with the Raspberry Pi.
- It is recommended to use a 5V 2.5A power adapter for the Raspberry Pi. If the Raspberry Pi is powered by the USB port of the PC, the Raspberry Pi may not be able to start normally due to an insufficient power supply.
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150mA.
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Support
Technical Support
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