[No screen test] PCF8574T-LCD-IIC control module-with small tutorial

Project Description

This project is an I2C control board verification module based on HGSEMI (Huaguan) PCF8574T port expansion chip. The main purpose is to save the shortcoming that the LCD takes up a lot of IO when used. It only requires 2 power lines and 2 data lines, and cooperates with the function library You can communicate! Save the io for other uses, and my mother will no longer have to worry about not having enough io.

Chip characteristics

How to use (Arduino)

wiring

code

There are many I2C LCD function libraries on the Internet. The one I want to use is LCD Library 1.2.1 (attachment). I won’t go into details about how to install the library.

#include 
#include 

LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); //0x27换成你的I2C地址，通过短接A0A1A2更换I2C地址

void setup()
{
lcd.begin(16,2); //1602LCD屏幕
lcd.backlight();//开启背光
//lcd.backlight(); //关闭背光

}

void loop()
{
lcd.setCursor(0,0); //设置光标位置第一行第一列是0,0
lcd.print("Hello World"); //能打印16个英文字母等（进阶玩法请自己搜索）
delay(100);
lcd.setCursor(0,1);
lcd.print("I am Scarrrr0725");
delay(1000);

lcd.clear();//清除内容
}

The default I2C address is 0x27 because none of the three jumper pads are shorted (1 = shorted)

Reference: http://www.electronoobs.com/eng_arduino_tut4.php