Arduino LCD1602顯示倒計(jì)時(shí)

ID:426684 · 發(fā)表于 2018-12-6 17:04

//LCD1602倒計(jì)時(shí)
#include <LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);    //構(gòu)造一個(gè)LiquidCrystal的類成員。使用數(shù)字IO ，12,11,5,4,3,2
unsigned long time;
unsigned long starttime;
int timeHour;  //顯示小時(shí)數(shù)
int timeMinute; //顯示分鐘數(shù)
int timeSecond; //顯示秒數(shù)
int startHour=0; //初始小時(shí)數(shù)
int startMinute=1;  //初始分鐘數(shù)
int startSecond=40;  //初始秒數(shù)
void setup()
{
Serial.begin(9600);
lcd.begin(16,2); //初始化LCD1602
lcd.print("Welcome to use!"); //液晶顯示W(wǎng)elcome to use！
delay(1000);       //延時(shí)1000ms
lcd.clear();       //液晶清屏
starttime=startHour*60*60+startMinute*60+startSecond;
lcd.setCursor(0,0);       //設(shè)置液晶開始顯示的指針位置
lcd.print("While accounting");
}

void loop(){
if (millis()<=starttime*1000){
time =starttime-(millis()/1000);
timeHour=time/(60*60);
timeMinute=(time-timeHour*60*60)/60;
timeSecond=time-timeHour*60*60-timeMinute*60;
lcd.setCursor(0,1);       //設(shè)置液晶開始顯示的指針位置
lcd.print("Time:");
lcd.print(Pressing_string(timeHour));
lcd.print(":");
lcd.print(Pressing_string(timeMinute));
lcd.print(":");
lcd.print(Pressing_string(timeSecond));
//delay(10);
}else{
lcd.setCursor(0,1);       //設(shè)置液晶開始顯示的指針位置
lcd.print("It's game over.");
}
}
//n->"0n",nn->"nn"
String Pressing_string(int myint){
String mystring;
if (myint<10 ){
mystring="0"+String(myint);
}else{
mystring=String(myint);
}
return mystring;
}