Arduino简单数字时钟.docx

显示时间原理：使用arduino的mills()函数，其功能是获取系统运行的时间长度，通过运行的秒数计算分、时、进而计算天、月、年程序如下：/* * LCD RS pin to digital pin 12 * LCD Enable pin to digital pin 11 * LCD D4 pin to digital pin 5 * LCD D5 pin to digital pin 4 * LCD D6 pin to digital pin 3 * LCD D7 pin to digital pin 2 * LCD R/W pin to ground * LCD VSS pin to ground * LCD VCC pin to 5V */#include LiquidCrystal.h //LCD1602显示头文件LiquidCrystal lcd(12, 11, 5, 4, 3, 2); unsigned long seconds;int s = 0, m = 0, h = 0, d = 0, mon = 0, y = 0; //时间进位int second = 0, minute = 0, hour = 0, day = 0, month = 0, year = 0; //当前时间int SECOND = 0, MINUTE = 0, HOUR = 0, DAY = 0, MONTH = 0, YEAR = 0; //初始时间void setup(){ lcd.begin(16, 2); lcd.setCursor(2, 1); lcd.print(:); lcd.setCursor(5, 1); lcd.print(:); lcd.setCursor(4, 0); lcd.print(-); lcd.setCursor(7, 0); lcd.print(-); for(int i = 2;i = 13; i++) { pinMode(i,OUTPUT); } set(2015,5,15,22,19,32); //设置初始时间}void FormatDisplay(int col, int row,int num) //格式化输出{ lcd.setCursor(col, row); if(num 10) lcd.print(0); lcd.print(num); }void time() //计算时间{ second = ( SECOND + seconds ) % 60; //计算秒 m = ( SECOND + seconds ) / 60; //分钟进位 FormatDisplay(6,1,second); minute = ( MINUTE + m ) % 60; //计算分钟 h = ( MINUTE + m ) / 60; //小时进位 FormatDisplay(3,1,minute); hour = ( HOUR + h ) % 24; //计算小时 d = ( HOUR + h ) / 24; //天数进位 FormatDisplay(0,1,hour); }int Days(int year, int month) //根据年月计算当月天数{ int days = 0; if (month != 2) { switch (month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12: days = 31; break; case 4: case 6: case 9: case 11: days = 30; break; } } else //闰年 { if (year % 4 == 0 year % 100 != 0 || year % 400 == 0) days = 29; else days = 28; } return days; }void Day() //计算当月天数{ int days = Days(year,month); int days_up; if( month == 1 ) days_up = Days( year - 1, 12 );