LCD1602液晶屏 I2C接口实验 时间显示

LCD1602液晶屏 I2C接口实验 时间显示 党湾一小学习资料 #include <Wire.h> #include <LiquidCrystal_I2C.h> //LCD1602显示头文件 LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display 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.init(); lcd.backlight(); 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(2017,1,11,9,58,32); //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 1 / 4 党湾一小学习资料 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 ); else days_up = Days( year, month - 1 ); day = ( DAY + d ) % days; if( day == 0 ) day = days; if( ( DAY + d ) == days + 1 ) { DAY -= days; mon++; } if(( DAY + d ) == 0) { DAY += days_up; mon--; } FormatDisplay(8,0,day); } 2 / 4 党湾一小学习资料 void Month() //计算月份 { month = ( MONTH + mon ) % 12; if( month == 0 ) month = 12; y = ( MONTH + mon - 1) / 12; FormatDisplay(5,0,month); } void Year() //计算年份 { year = ( YEAR + y ) % 9999; if( year == 0 ) year = 9999; lcd.setCursor(0, 0); if(year < 1000) { lcd.print("0"); } if(year < 100) { lcd.print("0"); } if(year < 10) { lcd.print("0"); } lcd.print(year); } void Week(int y,int m, int d) //根据年月日计算星期几 { if(m==1) m=13; if(m==2) m=14; int week=(d+2*m+3*(m+1)/5+y+y/4-y/100+y/400)%7+1; String weekstr=""; switch(week) { case 1: weekstr="Mon. "; break; case 2: weekstr="Tues. "; break; case 3: weekstr="Wed. "; break; case 4: weekstr="Thur. "; break; case 5: weekstr="Fri. "; break; case 6: weekstr="Sat. "; break; case 7: weekstr="Sun. "; break; } lcd.setCursor(11, 0); lcd.print(weekstr); } void set(int y, int mon, int d, int h, int m, int s) { YEAR = y; MONTH = mon; DAY = d; 3 / 4 党湾一小学习资料 HOUR = h; MINUTE = m; SECOND = s; } void Display() //显示时间、日期、星期 { time(); Day(); Month(); Year(); Week(year,month,day); } void loop() { seconds = millis()/1000; Display(); } 4 / 4