16x2 LCD 4隻腳位

GND

3v

SDA    GPIO21

SCL     GPIO22

#include <Wire.h>
#include "LiquidCrystal_I2C.h"
 
//LiquidCrystal_I2C lcd(0x27);  // Set the LCD I2C address
LiquidCrystal_I2C  lcd(0x27,2,1,0,4,5,6,7);
void setup()
{
  Serial.begin(115200);
  lcd.begin (16,2); // for 16 x 2 LCD module
  lcd.setBacklightPin(3,POSITIVE);
  lcd.setBacklight(HIGH);
}
void loop()
{ 
  lcd.home ();                 
  lcd.print("Hello, ESP32"); 
  lcd.setCursor ( 0, 1 );     
  lcd.print (" by Ghosty   ");
  delay ( 1000 );
}