Difference between revisions of "Template:RPi LCD User Manual"

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== Screen orientation settings ==
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== '''Screen orientation settings''' ==
 
After touch driver installed, the screen orientation can be set by these commands:
 
After touch driver installed, the screen orientation can be set by these commands:
 
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{{#switch: {{FULLPAGENAME}}
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== Touch screen calibration ==
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== '''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
 
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
 
  sudo apt-get install -y xinput-calibrator
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{{Virtual Keyboard Installation}}
 
{{Virtual Keyboard Installation}}
  
== How to work with a camera ==
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== '''How to work with a camera''' ==
 
<!--  
 
<!--  
 
RPi LCD can also work with an external camera to take photos. In this operation, a Raspberry Pi camera is required, which should be purchased separately.  
 
RPi LCD can also work with an external camera to take photos. In this operation, a Raspberry Pi camera is required, which should be purchased separately.  

Revision as of 10:01, 11 August 2020

Getting Started

Hardware Connection

  • There are 40 pins on Raspberry Pi but only 26 pins on the LCD, so you should pay attention to connecting the pins to your Pi accordingly.

Install the touch driver

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

Please download the latest 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, 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 installing, 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.

  • For 2.8inch RPi LCD (A):
./LCD28-show 
  • For 3.2inch RPi LCD (B):
./LCD32-show 
  • For 3.2inch RPi LCD (C):
./LCD32C-show
  • For 3.5inch RPi LCD (A):
./LCD35-show 
  • For 3.5inch RPi LCD (B):
./LCD35B-show 
  • For 3.5inch RPi LCD (C):
./LCD35C-show 
  • For 4inch RPi LCD (A):
./LCD4-show 
  • For 4inch RPi LCD (C):
./LCD4C-show

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 with Raspbian-lite, the command of the touch driver installation should be:
  • For 2.8inch RPi LCD (A):
./LCD28-show lite
  • For 3.2inch RPi LCD (B):
./LCD32-show lite
  • For 3.2inch RPi LCD (C):
./LCD32C-show lite
  • For 3.5inch RPi LCD (A):
./LCD35-show lite
  • For 3.5inch RPi LCD (B):
./LCD35B-show lite
  • For 3.5inch RPi LCD (C):
./LCD35C-show lite
  • For 4inch RPi LCD (A):
./LCD4-show lite
  • For 4inch RPi LCD (C):
./LCD4C-show lite

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:

  • For 2.8inch RPi LCD (A):
./LCD28-show 
  • For 3.2inch RPi LCD (B):
./LCD32-show 
  • For 3.2inch RPi LCD (C):
./LCD32C-show
  • For 3.5inch RPi LCD (A):
./LCD35-show 
  • For 3.5inch RPi LCD (B):
./LCD35B-show 
  • For 3.5inch RPi LCD (C):
./LCD35C-show 
  • For 4inch RPi LCD (A):
./LCD4-show 
  • For 4inch RPi LCD (C):
./LCD4C-show

Screen orientation settings

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

  • For 2.8inch RPi LCD (A):
./LCD28-show degree
  • For 3.2inch RPi LCD (B):
./LCD32-show degree
  • For 3.5inch RPi LCD (A):
./LCD35-show degree
  • For 3.5inch RPi LCD (B):
./LCD35B-show degree
  • For 3.5inch RPi LCD (C):
./LCD35C-show degree
  • For 4inch RPi LCD (A):
./LCD4-show degree
  • For 4inch RPi LCD (C):
./LCD4C-show degree

The degree can be specified as 0, 90, 180, 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.

Control Backlight Brightness with GPIO

Use a 0R resistor or solder to connect this pad.
Virtual Keyboard Installation01.png
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, 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 which is similar to below: (It maybe different in different version)

Plugin {
type = launchbar
Config {
Button {
id=lxde-screenlock.desktop
}
Button {
id=lxde-logout.desktop
}
}

7. Append these statements to add an button option:

Button {
id=/usr/local/share/applications/toggle-matchbox-keyboard.desktop
}

RPILCD-INSTALL-KEYBOARD01.png

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


How to work with a camera

1. Select "Enable Camera" -> "<YES>"

sudo raspi-config

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

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.