问16X02不显示任何字符

EN

#include <LiquidCrystal_I2C.h>

// Construct an LCD object and pass it the 
// I2C address, width (in characters) and
// height (in characters). Depending on the
// Actual device, the IC2 address may change.
LiquidCrystal_I2C lcd(0x27, 16, 2); // my lcd pin address is different from the example

void setup() {

  // The begin call takes the width and height. This
  // Should match the number provided to the constructor.

  Serial.begin(115200);
  Serial.println ("In Setup");
  lcd.begin(16,2);
  lcd.init();

  // Turn on the backlight.

  lcd.backlight();

  // Move the cursor characters to the right and
  // zero characters down (line 1).

  lcd.setCursor(5, 0);

  // Print HELLO to the screen, starting at 5,0.

  lcd.print("HELLO");

  // Move the cursor to the next line and print
  // WORLD.

  lcd.setCursor(5, 1);      
  lcd.print("WORLD");
}

void loop() {
}