3.2inch RPi LCD (B)

3.2inch RPi LCD (B) 320 × 240 3.2 inch Resistive Touch Screen TFT LCD Designed for Raspberry Pi, Raspbian IMG Provided

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Primary Attribute Category: OLEDs / LCDs, Raspberry Pi LCD {{{userDefinedInfo}}}: {{{userdefinedvalue}}} Brand: Waveshare

Website International: 3.2inch RPi LCD (B) Chinese: 3.2inch RPi LCD (B)

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Overview

Introduction

3.2-inch Resistive Touch Screen TFT LCD is designed for Raspberry Pi and provides Raspbian IMG.

More

Features

• The hardware resolution is 320 × 240.
• Resistive touch control.
• It is compatible and can be directly inserted into any version of Raspberry Pi.
• Drivers provided (works with your own Raspbian/Ubuntu/Kali and Retropie system directly).
• Support FBCP software driver, can set the software resolution and dual-screen display.
• Gold sinking process, fine carving.

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.

Install the touch driver

The RPi LCD can be driven in two ways: Method 1. Install the driver to your Raspbian 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 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, 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.

chmod +x LCD32-show
 ./LCD32-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 Raspbian-lite, the command of the touch driver installation should be:

 ./LCD32-show lite

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.
#If it is an old version, execute the following code:
sudo ./LCD28-show X
#If it is a new version, execute the following code:
sudo ./LCD28-show-V2 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.
#If it is an old version, execute the following code:
sudo ./LCD28-show lite X
#If it is a new version, execute the following code:
sudo ./LCD28-show-V2 lite X

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 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:

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 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

PIN NO.	SYMBOL	DESCRIPTION
1, 17	3.3V	Power positive (3.3V power input)
2, 4	5V	Power positive (5V power input)
3, 5, 7, 8, 10, 22	NC	NC
6, 9, 14, 20, 25	GND	Ground
11	TP_IRQ	Touch Panel interrupt, low level while the Touch Panel detects touching
12	KEY1	button
13	RST	Reset
15	LCD_RS	Command/data register selection, low-level select command, high-level select data.
16	KEY2	button
18	KEY3	button
19	LCD_SI / TP_SI	LCD display/SPI data input of Touch Panel
21	TP_SO	SPI data output of Touch Panel
23	LCD_SCK / TP_SCK	LCD display/SPI clock of Touch Panel
24	LCD_CS	LCD chip selection, low active
26	TP_CS	Touch Panel chip selection, low active

Resource

User Manual

• RPi LCD User Manual

Image

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

• RPi-2.8inch_32inch-LCD-Raspbian-180326.img.7z

Driver

The driver can be downloaded from github

git clone https://github.com/waveshare/LCD-show.git

Software

• Panasonic SDFormatter
• Win32DiskImager
• PuTTY

LCD Panel Dimension

• 3.2inch RPi LCD (B) panel dimension

FAQ

Question:Why can not the LCD be used normally when using the official image provided by the Raspberry Pi?

 Answer:

The LCD must have a driver installed for normal use. For details, please refer to the relevant introduction in the user manual.

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Question:Why can not the LCD be used normally when using the Raspberry Pi image provided by waveshare?

 Answer:

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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Question:What is the operating temperature of the 3.5inch RPi LCD (C)?

 Answer:

Commercial grade (0~70 degrees Celsius).

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Question:What are the power requirements?

 Answer:

When working with 5V input, the current is about 200mA.

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