Arduino驱动 LCD1602/2004液晶屏转接板模块

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一、简介

点击图片购买

LCD1602/2004液晶屏转接板模块采用MCP2308芯片，通过IIC接口扩展8路通用双向IO口。可以为较少IO口的单片机扩展IO口，还可以作为LCD1602、LCD2004液晶屏提供简化的接线方案。由于采用IIC通信，可以在IIC总线上挂载多个LCD1602、LCD2004液晶屏或扩展更多的通用IO引脚，大大减少了主控单片机的IO口，使得扩展更加容易。

二、内部逻辑图

三、引脚说明

PH2.0 4P插座接口

V	电源正极
G	电源负极
C	IIC接口时钟信号线SCL
D	IIC接口数据信号线SDA

四、原理图

五、器件地址

六、使用方法

实验准备

LCD1602/2004液晶屏转接板模块	1个
原装正版Arduino uno r3开发板	1个
1602 LCD液晶屏 5.0V 黄绿屏	1个
USB2.0打印机数据线高速方口连接转接线 A公对B公	1条
杜邦线	若干

接线

Arduino	LCD1602/2004液晶屏转接板模块
5V	V
GND	G
SCL	C
SDA	D

程序下载

/*
 Demonstration sketch for Adafruit i2c/SPI LCD backpack
 using MCP23008 I2C expander
 ( http://www.ladyada.net/products/i2cspilcdbackpack/index.html )

 This sketch prints "Hello World!" to the LCD
 and shows the time.
 
  The circuit for Duemilanove
 * 5V to Arduino 5V pin
 * GND to Arduino GND pin
 * CLK to Analog #5
 * DAT to Analog #4

  For other boards, use the following chart (CLK=SCL,DAT=SDA)
  Board      I2C / TWI pins
  ---------  --------------------------
  Uno, Yun   A4 (SDA), A5 (SCL)
  Mega2560   20 (SDA), 21 (SCL)
  Leonardo    2 (SDA),  3 (SCL)
  Due        20 (SDA), 21 (SCL)
*/

// include the library code:
#include <Wire.h>
#include "LiquidTWI2.h"

// Connect via i2c, address 0x20 (A0-A2 not jumpered)
LiquidTWI2 lcd(0x20);

void setup() {
    
    
  // set the LCD type
  lcd.setMCPType(LTI_TYPE_MCP23008); 
//  lcd.setMCPType(LTI_TYPE_MCP23017); 
  // set up the LCD's number of rows and columns:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");
}

void loop() {
    
    
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);

  lcd.setBacklight(HIGH);
  delay(500);
  lcd.setBacklight(LOW);
  delay(500);
}

实验现象