1602 LCD显示生日快乐走马灯效果

happy_birthday.cpp

#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>  // F Malpartida's NewLiquidCrystal library


#define I2C_ADDR    0x27  // Define I2C Address for controller
#define BACKLIGHT_PIN  3
#define En_pin  2
#define Rw_pin  1
#define Rs_pin  0
#define D4_pin  4
#define D5_pin  5
#define D6_pin  6
#define D7_pin  7

#define  LED_OFF  0
#define  LED_ON  1
LiquidCrystal_I2C  lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin,BACKLIGHT_PIN,POSITIVE);

const char* banners[] ={
  " Happy birthday ",
  "    to Siyi!    ",
  " Wish you have  ",
  " a better year! ",
  "Welcome to Yi's ",
  "Birthday party  "
}; 

char banner1[17];
char banner2[17];

int line = 0;

void banner_init() {
  for(int i = 0; i<16;i++) {
    banner1[i] = ' ';
    banner2[i] = ' ';
  }
  banner1[16] = '\0';
  banner2[16] = '\0';
}

void banner_transit(int step){
  for(int i=0; i<16; i++) {
    strncpy(banner1, banner1 + 1, 15);
    strncpy(banner2, banner2 + 1, 15);
    banner1[15] = banners[line][i];
    banner2[15] = banners[line + 1][i];
    banner_display();
    delay(step);
  }
}

void banner_display() {
  lcd.setCursor(0,0); 
  lcd.print(banner1);
  lcd.setCursor(0,1); 
  lcd.print(banner2);
}

void setup() 
{
  banner_init();
  line = 0;

  lcd.begin (16,2);  // initialize the lcd
  lcd.backlight();  
  lcd.clear();
  lcd.home();
}

void loop()  
{
  banner_transit(30);
  delay(2000);
  line = (line+2) % 6;
}