Difference between revisions of "3.5inch RPi LCD (A)"

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*[http://www.waveshare.com/product/3.5inch-RPi-LCD-A.htm Introduction]
 
*[http://www.waveshare.com/product/3.5inch-RPi-LCD-A.htm Introduction]
 
*[http://www.waveshare.com/w/upload/3/3e/RPi-LCD-User-Manual.pdf User manual]
 
*[http://www.waveshare.com/w/upload/3/3e/RPi-LCD-User-Manual.pdf User manual]
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*[[:File:3.5inch-RPi-LCD-A-Schematic.pdf|Schematic]]
 
{{RPi_LCD_Application_Notes}}
 
{{RPi_LCD_Application_Notes}}
 
{{RPi_Software}}
 
{{RPi_Software}}

Revision as of 10:05, 11 November 2015

3.5inch-RPi-LCD-A
3.5inch RPi LCD (A)

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.

chmod +x LCD35-show
 ./LCD35-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:
 ./LCD35-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:

 ./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 through the xinput-calibrator program. 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, 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 file exists).
sudo mkdir /etc/X11/xorg.conf.d
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:

5inch HDMI LCD FAQ1.jpg

  • Press the keys Ctrl+X, and select 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.

Install Virtual Keyabord

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

nano ~/.config/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. Template:Resource list

FAQ

Question:
How to apply the RPi LCD in a custom Raspbian system image?
Answer:

Configure your Pi:

sudo raspi-config
  • Select Expand Filesystem.
  • You should make sure the custom mirror image used can boot to desktop. Check the configuration: Enable Boot to Desktop/Scratch -> Desktop Log in as user 'pi' at the graphical desktop

Download LCD-show-YYMMDD.tar.gz and extract it. Copy the file LCD-show.tar.gz into your custom mirror image via the network or an U disk. Run the following commands:

tar xvf LCD-show.tar.gz
cd LCD-show/
  • For 3.2inch RPi LCD (B), run the command:
sudo ./LCD32-show
  • For 3.5inch RPi LCD (A), run the command:
sudo ./LCD35-show
  • For 4inch RPi LCD (A), run the command:
sudo ./LCD4-show
  • For 5inch HDMI LCD, run the command:
sudo ./LCD5-show

Then, wait a few minutes, the system will restart automatically. When finished, the RPi LCD is ready to use.

To switch to HDMI display, run the command:

sudo ./LCD-hdmi


Question:
Why the LCD doesn't work with my Raspbian?
Answer:
To use the LCD with the Raspberry Pi official image, driver should be installed first. Please refer to the user manual.

However, for the first testing, you may want to use our provided image directly.


Question:
Why the LCD still doesn't work with the Waveshare provided image?
Answer:
Make sure the hardware connection is correct and connects fine.

Make sure the image in TF card is burnt correctly.

The PWR will keep on and the ACT will keep blinking when the Raspberry Pi starts up successfully, in case both of the two LEDs keep on, it is possible that the image were burnt incorrectly OR the TF card were in bad contact.


Question:
Which power supply should I use?
Answer:
It is strongly recommended to use a stand-alone 5V/2A power adapter, because the USB port of PC might not have enough power to support the Pi and LCD.


Support

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