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Raspberry LCD 3.5

Introduction

3.5 inch Touch Screen TFT LCD Designed for Raspberry Pi

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Getting Started

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:

sudo raspi-config

Set as:

  • 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 LCD35-show
./LCD35-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:dtoverlay=ads7846

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? SeeRPi Image Installation Guidesfor 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:

./LCD35-show

Screen orientation settings

After touch driver installed, the screen orientation can be set by these commands:

  • 0 degree rotation
cd LCD-show/
./LCD35-show 0
  • 90 degree rotation
cd LCD-show/
./LCD35-show 90
  • 180 degree rotation
cd LCD-show/
./LCD35-show 180
  • 270 degree rotation
cd LCD-show/
./LCD35-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:

sudo 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>"

sudo raspi-config

2. Copy theCamera driverto 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

Append:

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

Append:

APT::Default-release \"stable";

Exit with save.

5. Create a file called libsdl.

sudo nano /etc/apt/preferences.d/libsdl

Append:

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.

Resource

Image

Description: if you felt hard to install driver, try the image with driver pre-installed.

Driver

The drivers are not available for NOOBS or any system installed by NOOBS.

If the touch screen doesn't work properly, please install the driver: LCD-show-170703.tar.gz, but not LCD-show-161112.tar.gz.

Software

LCD Panel Dimension

Comments   

 
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