1.3inch LCD HAT B

The 1.3inch LCD Display Module is a compact and high-quality screen designed for versatile DIY projects. Featuring an 8-pin SPI interface and a 240 x 240 resolution, this display is powered by the ST7789 controller, ensuring smooth and efficient performance. Pre-soldered with nut copper pillars, it offers easy installation and stability.Provides demo code for platforms such as Raspberry Pi and Arduino. It can draw dots, lines, rectangles, and circles, as well as display images and text in both Chinese and English. Offers greater playability and DIY potential.

1.Product Features

• Built-in ST7789 controller
• 240 x 240 resolution
• Uses SPI interface, requiring fewer pins
• Ultra-compact size with pre-soldered nuts for easy installation
• Provides example programs for Raspberry Pi and Arduino development boards

2.Interface Definition

Specification	Details
Model	1.3INCH LCD HAT
Chip	ST7789
Operating Voltage	3.3V
Color Display	RGB 65K colors
Resolution	240 x 240
Communication Interface	4-wire SPI
Mounting Holes	2.5mm diameter
LCD Display Area	23.4mm (L) × 23.4mm (W)
Dimensions	29mm (L) × 26mm (W)

3.Usage

Since the Bookworm system no longer supports the WiringPi library, the example programs for this system use the lgpio library instead. For the Bullseye system, the WiringPi version of the example programs can still be used.

3.1 Hardware Interface Configuration Instructions

3.1.1 Raspberry Pi Hardware Connection

The corresponding pin connections between the LCD and the Raspberry Pi are shown in the table below:

The wiring diagram for the connection between the Raspberry Pi and the LCD display is shown below:

3.1.2 Arduino Hardware Connection

The corresponding pin connections between the LCD and the Arduino are shown in the table below:

LCD interface	Arduino UNO
VCC	5V
GND	GND
DIN	D11
SCK	D13
CS	D10
RST	D9
DC	D8
BL	D7

The wiring diagram for the connection between the Arduino and the LCD display is shown below;

3.2 Demonstration Code

3.2.1 Installing the WiringPi Library

Start by configuring the Raspberry Pi system:

sudo raspi-config

Start configuring the Raspberry Pi system:

sudo raspi-config
sudo apt-get install wiringpi
Wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb 
gpio -v # If version 2.52 appears, the installation is successful

#For the Bullseye branch system, use the following command:

git clone https://github.com/WiringPi/WiringPi
cd WiringPi 
./build 
gpio -v

#When running gpio -v, it should display version 2.70. If not, it indicates that the installation was unsuccessful.

If an error message such as "ImportError: No module named 'wiringpi'" appears when running the Python version of the example program, please execute the following command:

#Applicable for Python 2.x versions

pip install wiringpi

#Applicable for Python 3.x versions

pip3 install wiringpi

Note: If the installation fails, you can try compiling and installing it manually as follows:

git clone --recursive http://github.com/WitingPi/WiringPi-Python.git

Note: The --recursive option will automatically fetch submodules; otherwise, you will need to download them manually.

Enter the WiringPi Python folder you just downloaded and run the following commands to compile and install:

#Applicable for Python 2.x versions

sudo python setup.py install

#Applicable for Python 3.x versions

sudo python3 setup.py install

If the following error occurs:

At this point, enter the command sudo apt install swig to install SWIG.

Then compile and install by running sudo python3 setup.py install.

If a message similar to the following appears, it means the installation was successful

3.2.2 Installing the LGPIO Library

For the Bookworm system, the example programs use the lgpio library.

The installation command for the library is as follows:

wget https://github.com/joan2937/lg/archive/master.zip
unzip master.zip 
cd lg-master
make
sudo make install

3.2.3 Demonstration Program

Enable and use the SPI interface.

sudo raspi-config

Select Interfacing Options → SPI → Yes in sequence.

Check the enabled SPI devices.

ls /dev/spi*

It should display: "/dev/spidev0.0" and "/dev/spidev0.1".

Installing Python Libraries

The demonstration code runs in a Python 3 environment.

To run the Python example code, you need to install the PIL, numpy, and spidev libraries.

Please run the following command to install them:

sudo apt-get install python3-pil
sudo apt-get install python3-numpy
sudo apt-get install python3-pip
sudo pip3 install spidev

C Example Program

The demonstration code is structured into two layers: the lower layer and the application layer.

The lower layer consists of the files lcd_1.3inch.c and lcd_1.3inch.h, which handle the initialization of the Raspberry Pi control pins and the LCD screen.

The application layer includes lcd_gui.c and lcd_gui.h, primarily responsible for drawing points, lines, rectangles, and circles, as well as displaying Chinese/English images and characters.

Files beginning with "font" are related to font libraries. Files with the ".c" suffix contain font data sources, and multiple font data structures are defined in fonts.h.

In the Raspberry Pi demo code, files with the ".bmp" suffix are image source files used for display.

In the Arduino UNO demo code, there are no ".bmp" files due to the UNO's limited available memory.

Instead, the image source data is stored as arrays within the image.cpp file.

To access the C demonstration code, navigate to the 1.3inch_lcd/c directory and execute the following command:

sudo make clean
sudo make
sudo ./main

Python Example Program

The Python example program is provided exclusively for the Raspberry Pi platform.

Since the Python environment can utilize the PIL (Python Imaging Library), many application layer API functions can be directly handled by the library, significantly reducing the amount of example code needed.

To access the Python demonstration code, navigate to the 1.3inch_lcd/python directory

python3 gui.py