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.

../_images/list_i2c_lcd.png

It’s definitely convenient to buy a whole kit, here’s the link:

Name

ITEMS IN THIS KIT

LINK

Raphael Kit

337

Raphael Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION

PURCHASE LINK

GPIO Extension Board

BUY

Breadboard

BUY

Jumper Wires

BUY

I2C LCD1602

BUY

Schematic Diagram

T-Board Name

physical

SDA1

Pin 3

SCL1

Pin 5
../_images/schematic_i2c_lcd.png

Experimental Procedures

Step 1: Build the circuit.

../_images/image96.png

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

Step 3: Change directory.

cd ~/raphael-kit/python/

Step 4: Run.

sudo python3 1.1.7_Lcd1602.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 raphael-kit/python. After modifying the code, you can run it directly to see the effect.

import LCD1602
import time

def setup():
    LCD1602.init(0x27, 1)   # init(slave address, background light)
    LCD1602.write(0, 0, 'Greetings!')
    LCD1602.write(1, 1, 'From SunFounder')
    time.sleep(2)

def destroy():
    LCD1602.clear()

if __name__ == "__main__":
    try:
        setup()
    except KeyboardInterrupt:
        destroy()

Code Explanation

import LCD1602

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

LCD1602.init(0x27, 1)

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.

LCD1602.write(0, 0, 'Greetings!')

Within this function, ‘Greetings!! ‘ is the character to be printed on the Row 0+1, column 0+1 on LCD. Now you can see “Greetings!! From SunFounder” displayed on the LCD.

Phenomenon Picture

../_images/image97.jpeg