#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define LCD_I2C_ADDR 0x27
#define PCF8574_I2C_ADDR 0x20
#define LCD_COLUMNS 16
#define LCD_ROWS 2
LiquidCrystal_I2C lcd(LCD_I2C_ADDR, LCD_COLUMNS, LCD_ROWS); // Modified initialization
void setup() {
Wire.begin();
// Initialize the LCD
lcd.begin(LCD_COLUMNS, LCD_ROWS); // Modified initialization
// Initialize the PCF8574
Wire.beginTransmission(PCF8574_I2C_ADDR);
Wire.write(0xFF); // Set all pins of PCF8574 as inputs (if needed)
Wire.endTransmission();
// Turn on the backlight
lcd.backlight();
// Print a message to the LCD
lcd.setCursor(0, 0);
lcd.print("Hello, World!");
lcd.setCursor(0, 1);
lcd.print("I2C LCD Test");
}
void loop() {
// Your loop code here
}