arduino学习笔记-库函数解析_LiquidCrystal_i2c使用说明以及lcd1602的驱动

article/2025/9/29 3:20:57

LiquidCrystal_i2c是一个通过i2c驱动lcd显示屏的库函数，具体使用说明如下

i2c转接芯片的型号 PCA8574

arduino R3

A05 为 SCL

A04 为 SDL

在头文件下要初始化对象

LiquidCrystal_I2C lcd(0x27,16,2);

对象名 lcd 可以任意，这关系到下面你使用方法的对象名

例如

如果你的初始化对象名为 lcd

LiquidCrystal_I2C lcd(0x27,16,2);

lcd.init(); // 初始化lCD

如果你的初始化对象名为 lcd1602

LiquidCrystal_I2C lcd1602(0x27,16,2);

lcd1602.init(); // 初始化lCD

LiquidCrystal_I2C lcd(0x27,16,2);

初始化对象中有三个参数，分别对应地址、列、行

地址取决于转接板上A0 A1 A2 的连接

悬空即拔掉跳线帽

短路即插上跳线帽

A0	A1	A2	ADDR
短路	短路	短路	0X20
悬空	短路	短路	0x21
短路	悬空	短路	0x22
悬空	悬空	短路	0x23
短路	短路	悬空	0x24
悬空	短路	悬空	0x25
短路	悬空	悬空	0x26
悬空	悬空	悬空	0x27

lcd.init(); // 初始化显示屏

lcd.clear();//清空显示屏

lcd.print(); //显示内容

lcd.backlight(); //背光

setCursor(x,y); //设置起始坐标

库函数

LiquidCrystal()
begin()
clear()
home()
setCursor()
write()
print()
cursor()
noCursor()
blink()
noBlink()
display()
noDisplay()
scrollDisplayLeft()
scrollDisplayRight()
autoscroll()
noAutoscroll()
leftToRight()
rightToLeft()
createChar()

参考代码

//DFRobot.com
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h>
#include <LiquidCrystal_I2C.h>#if defined(ARDUINO) && ARDUINO >= 100
#define printByte(args)  write(args);
#else
#define printByte(args)  print(args,BYTE);
#endifuint8_t bell[8]  = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
uint8_t note[8]  = {0x2,0x3,0x2,0xe,0x1e,0xc,0x0};
uint8_t clock[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
uint8_t duck[8]  = {0x0,0xc,0x1d,0xf,0xf,0x6,0x0};
uint8_t check[8] = {0x0,0x1,0x3,0x16,0x1c,0x8,0x0};
uint8_t cross[8] = {0x0,0x1b,0xe,0x4,0xe,0x1b,0x0};
uint8_t retarrow[8] = {	0x1,0x1,0x5,0x9,0x1f,0x8,0x4};LiquidCrystal_I2C lcd(0x20,20,4);  // set the LCD address to 0x20 for a 20 chars and 4 line display(All jumpers should be connected!)void setup()
{
//  Serial.begin(57600);lcd.init();                      // initialize the lcd lcd.backlight();lcd.createChar(0, bell);lcd.createChar(1, note);lcd.createChar(2, clock);lcd.createChar(3, heart);lcd.createChar(4, duck);lcd.createChar(5, check);lcd.createChar(6, cross);lcd.createChar(7, retarrow);lcd.home();lcd.setCursor(0, 0);for(int i = 0;i < 20; i++)  lcd.printByte(6);lcd.setCursor(0, 1);lcd.printByte(6);lcd.print("   Hello world    ");lcd.printByte(6);lcd.setCursor(0, 2);lcd.printByte(6);lcd.print("  i ");lcd.printByte(3);lcd.print(" arduinos!   ");lcd.printByte(6);lcd.setCursor(0, 3);for(int i = 0;i < 20; i++)  lcd.printByte(6);
//  lcd.clear();}void loop()
{}