3.2inch RPi LCD (B)
- 1 Introduction
- 2 Getting Started
- 3 Toggle between LCD and HDMI display
- 4 Screen orientation settings
- 5 Touch screen calibration
- 6 How to work with a camera
- 7 Resource
- 8 FAQ
- 9 Anti-Piracy
- 10 Beware of knock-offs
- 11 Support
3.2 inch Resistive Touch Screen TFT LCD Designed for Raspberry Pi, Raspbian IMG Provided
The RPi LCD can be driven in two ways: Method 1. install driver to your Raspbian OS. Method 2. use the Ready-to-use image file of which LCD driver was pre-installed.
Method 1. Driver installation
1. Configure your Pi:
- Select Expand Filesystem.
- Boot Option -> Desktop Autologin (may differ depending on Raspbian revision)
2. Copy the driver (choose the driver according to your OS) into your OS then Run the following commands:
tar xvf LCD-show-*.tar.gz cd LCD-show/
Install the driver and it toggles the mode to LCD display: Note: Net work connection is required while installing driver to your Pi, or else the touch won't work properly.
chmod +x LCD32-show ./LCD32-show
Note: this LCD won't work after apt-get upgrade, in such cases, please edit the config.txt file in the SD card and remove this statement:
3. After system rebooting, the RPi LCD is ready to use.
Method 2. Using Ready-to-use image
The image file with 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 to your Pi, power up and enjoy it.
Toggle between LCD and HDMI display
Once this LCD is enabled, meanwhile the default settings for HDMI are changed. If you want to use another HDMI monitor, please run the following command:
cd LCD-show/ ./LCD-hdmi
This toggles the mode to LCD display:
Screen orientation settings
After touch driver installed, the screen orientation can be set by these commands:
- 0 degree rotation
cd LCD-show/ ./LCD32-show 0
- 90 degree rotation
cd LCD-show/ ./LCD32-show 90
- 180 degree rotation
cd LCD-show/ ./LCD32-show 180
- 270 degree rotation
cd LCD-show/ ./LCD32-show 270
Touch screen calibration
This LCD can be calibrated using a program called xinput_calibrator which is pre-installed on the CD image. However, it was not pre-installed on original Raspbian OS. So in this case, you should get and install the program manually with
sudo apt-get install -y xinput-calibrator
Enter the following commands for touch screen calibration:
sudo DISPLAY=:0.0 xinput_calibrator
or select Menu -> Preferences -> Calibrate Touchscreen.
After running these commands, there will be a prompt for four-point calibration shown in the LCD screen. Click the points one by one to finish the touch calibration. Then, the new calibration data will be displayed in the terminal, as shows below. Please get these data for future use.
Doing dynamic recalibration: Setting new calibration data: 3919, 208, 236, 3913
Enter the following command to edit 99-calibration.conf:
sudo nano /etc/X11/xorg.conf.d/99-calibration.conf
Then, the old calibration data will be displayed in the terminal:
Section "InputClass" Identifier "calibration" MatchProduct "ADS7846 Touchscreen" Option "Calibration" "160 3723 3896 181" Option "SwapAxes" "1" EndSection
Modify the calibration data to the new calibration data displayed above):
Section "InputClass" Identifier "calibration" MatchProduct "ADS7846 Touchscreen" Option "Calibration" "3919 208 236 3913" Option "SwapAxes" "1" EndSection
Press the keys Ctrl+X, and select the option Y to save the modification.
The modification will be valid after rebooting the system. Enter the following command for system reboot:
Notices: In case of inaccurate touch, please perform screen calibration again and reboot the system.
How to work with a camera
1. Select "Enable Camera" -> "<YES>"
2. Copy the Camera driver to the OS of Pi then:
unzip camera.zip cd camera sudo chmod 777 Camera sudo cp update\ camera/95-stmpe.rules /etc/udev/rules.d/
3. Create a file called wheezy.list.
sudo nano /etc/apt/sources.list.d/wheezy.list
deb http://archive.raspbian.org/raspbian wheezy main
Exit with save.
4. Create a file called 10defaultRelease.
sudo nano /etc/apt/apt.conf.d/10defaultRelease
Exit with save.
5. Create a file called libsdl.
sudo nano /etc/apt/preferences.d/libsdl
Package: libsdl1.2debian Pin: release n=jessie Pin-Priority: -10 Package: libsdl1.2debian Pin: release n=wheezy Pin-Priority: 900
Exit with save.
6. Last, execute the commands:
sudo apt-get update sudo apt-get -y --force-yes install libsdl1.2debian/wheezy sudo apt-get install evtest tslib libts-bin xinput sudo apt-get install python-pip sudo apt-get install python2.7-dev sudo pip install picamera==1.10 sudo reboot sudo TSLIB_FBDEVICE=/dev/fb1 TSLIB_TSDEVICE=/dev/input/touchscreen ts_calibrate
Camera will be enabled by the steps above.
Description: if you felt hard to install driver, try the image with driver pre-installed.
If the touch screen doesn't work properly, please install the driver: LCD-show-170703.tar.gz, but not LCD-show-161112.tar.gz.
LCD Panel Dimension
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.