Wemos D1 1602 液晶屏幕

 

 接线：GND 5V D14 D15

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

LiquidCrystal_I2C lcd(0x3F,16,2);  // 设置液晶地址 0x27  设置一行显示的字符 16个 2 行显示

void setup()
{
  lcd.init();                      //初始化
 
  // Print a message to the LCD.
  lcd.backlight();   //打开背光
  lcd.print("Hello, world!");  //输出内容
}

void loop()
{
}

注意，液晶地址可能不同，无法点亮

地址查询

#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
}