1.1.7 I2C LCD1602

Introduction

LCD1602 is a character type liquid crystal display, which can display 32 (16*2) characters at the same time.

Required Components

In this project, we need the following components.

Schematic Diagram

T-Board Name	physical
SDA1	Pin 3
SCL1	Pin 5

Experimental Procedures

Step 1: Build the circuit.

Step 2: Setup I2C (see I2C Configuration. If you have set I2C, skip this step.)

Step 3: Change directory.

cd ~/davinci-kit-for-raspberry-pi/python-pi5

Step 4: Run.

sudo python3 1.1.7_Lcd1602_zero.py

After the code runs, you can see Greetings!, From SunFounder displaying on the LCD.

Note

• If you get the error FileNotFoundError: [Errno 2] No such file or directory: '/dev/i2c-1', you need to refer to I2C Configuration to enable the I2C.

• If you get ModuleNotFoundError: No module named 'smbus2' error, please run sudo pip3 install smbus2.

• If the error OSError: [Errno 121] Remote I/O error appears, it means the module is miswired or the module is broken.

• If the code and wiring are fine, but the LCD still does not display content, you can turn the potentiometer on the back to increase the contrast.

Code

Note

You can Modify/Reset/Copy/Run/Stop the code below. But before that, you need to go to source code path like davinci-kit-for-raspberry-pi/python-pi5. After modifying the code, you can run it directly to see the effect.

#!/usr/bin/env python3
import LCD1602  # Import module for interfacing with LCD1602
import time     # Import module for timing functions

def setup():
    # Initialize LCD with I2C address 0x27 and enable backlight
    LCD1602.init(0x27, 1)
    # Display the message 'Greetings!' at the top-left corner (row 0, column 0)
    LCD1602.write(0, 0, 'Greetings!')
    # Display the message 'From SunFounder' on the second line (row 1, column 1)
    LCD1602.write(1, 1, 'From SunFounder')
    time.sleep(2)  # Display messages for 2 seconds

try:
    setup()  # Run the setup function to initialize the LCD and display messages

except KeyboardInterrupt:
    # Clear the LCD display if a keyboard interruption (e.g., Ctrl+C) occurs
    LCD1602.clear()
    pass  # Proceed with no further action

Code Explanation

1. This file is an open source file for controlling I2C LCD1602. It allows us to easily use I2C LCD1602.

   import LCD1602  # Import module for interfacing with LCD1602
   

2. The function initializes the I2C system with the designated device symbol. The first parameter is the address of the I2C device, which can be detected through the i2cdetect command (see Appendix for details). The address of I2C LCD1602 is generally 0x27.

   # Initialize LCD with I2C address 0x27 and enable backlight
   LCD1602.init(0x27, 1)
   

3. LCD1602.write is used to display messages on the LCD. The first two parameters are row and column positions, and the third is the message. Now you can see “Greetings!! From SunFounder” displayed on the LCD.

   # Display the message 'Greetings!' at the top-left corner (row 0, column 0)
   LCD1602.write(0, 0, 'Greetings!')
   # Display the message 'From SunFounder' on the second line (row 1, column 1)
   LCD1602.write(1, 1, 'From SunFounder')