建议 "进行 Arduino 和 LCD1602 I2C 接口实验。

//LingShun lab
#include <Wire.h> 
#include <LiquidCrystal_I2C.h> //引用I2C库

//设置LCD1602设备地址，这里的地址是0x3F，一般是0x20，或者0x27，具体看模块手册
LiquidCrystal_I2C lcd(0x3F,16,2);  

void setup()
{
  lcd.init();                  // 初始化LCD
  lcd.backlight();             //设置LCD背景等亮
}

void loop()
{
  lcd.setCursor(0,0);                //设置显示指针
  lcd.print("LCD1602 iic Test");     //输出字符到LCD1602上
  lcd.setCursor(0,1);
  lcd.print("         by L.L.");
  delay(1000);
}

#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
}