//Code1
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x3F,16,2); // set the LCD address to 0x27 for a 16 chars and 2 line display

void setup(){
  lcd.init(); // initialize the lcd 
  lcd.backlight(); //Open the backlight
  lcd.print("Welcome to "); // Print a message to the LCD.
  lcd.setCursor(0,1); //newline
  lcd.print("www.CSDN.com");// Print a message to the LCD
}

void loop(){
}
 

//Find Address
#include <Wire.h>
 
void setup(){
  Wire.begin();
  Serial.begin(9600);
  Serial.println("\nI2C Scanner");
}
void loop(){
  byte error, address;
  int nDevices;
  Serial.println("Scanning...");
  nDevices = 0;
  for (address = 1; address < 127; address++ ){
    // The i2c_scanner uses the return value of
    // the Write.endTransmisstion to see if
    // a device did acknowledge to the address.
    Wire.beginTransmission(address);
    error = Wire.endTransmission();
    if (error == 0){
      Serial.print("I2C device found at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.print(address, HEX);
      Serial.println(" !");
      nDevices++;
    }else if (error == 4){
      Serial.print("Unknow error at address 0x");
      if (address < 16)
        Serial.print("0");
      Serial.println(address, HEX);
    }
  }
  if (nDevices == 0)
    Serial.println("No I2C devices found\n");
  else
    Serial.println("done\n");
  delay(5000); // wait 5 seconds for next scan
}
 

開發中遇到的問題

1、螢幕無顯示

2、一行黑點

地址錯誤，使用程式碼二檢視地址，然後修改程式碼一。

3、如何連線跳線

GND-GND

VCC-5V

SDA-A4

SCL-A5