#include <LiquidCrystal_I2C.h> //引用I2C库
LiquidCrystal_I2C lcd(0x27, 16, 2);//I2C设备地址、列数，行数
unsigned long starttime;//计时开始时刻
unsigned long stoptime;//计时终止时刻
unsigned long looptime;//计时长度
unsigned char k=0;//光标初始位置
unsigned char Nowhour=12;//小时调整
unsigned char Nowminute=13;//分钟调整
void setup() {
// put your setup code here, to run once:
lcd.init(); // 初始化LCD
lcd.backlight(); //设置LCD背景灯亮
starttime = millis();//上电计时开始（毫秒）
}
void loop() {
// put your main code here, to run repeatedly:
unsigned char Second, Hsecond, Lsecond, Minute, Hminute, Lminute, Hour, Hhour, Lhour;
stoptime = millis();
looptime = stoptime - starttime;
Second = (looptime / 1000) % 60;//计算秒
Hsecond = Second / 10;//秒的十位
Lsecond = Second % 10;//秒的个位
Minute = (Nowminute+(looptime / 1000) / 60) % 60;
Hminute = Minute / 10;//分钟的十位
Lminute =Minute % 10;//分钟的个位
Hour = (Nowhour+(looptime / 1000) / 3600) % 24;
Hhour = Hour / 10;//小时的十位
Lhour = Hour% 10;//小时的个位
Lcd_XianShi(k%16, 0, Hhour);//显示小时的十位
Lcd_XianShi((k+1)%16, 0, Lhour);//显示小时的个位
Lcd_XianShi((k+3)%16, 0, Hminute);//显示分钟的十位
Lcd_XianShi((k+4)%16, 0, Lminute);//显示分钟的个位
Lcd_XianShi((k+6)%16, 0, Hsecond);//显示秒的十位
Lcd_XianShi((k+7)%16, 0, Lsecond);//显示秒的个位
if (Second % 2 == 1)//显示冒号
{
lcd.setCursor((k+2)%16, 0);
lcd.print(":");
lcd.setCursor((k+5)%16, 0);
lcd.print(":");
}
if (Second % 2 == 0)//不显示冒号
{
lcd.setCursor((k+2)%16, 0);
lcd.print(" ");
lcd.setCursor((k+5)%16, 0);
lcd.print(" ");
}
}
void Lcd_XianShi(unsigned char a, unsigned char b, unsigned char c)
{
lcd.setCursor(a, b); //设置显示光标位置
lcd.print(c);
}
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