Arduino UNO DS3231RTC芯片 TM1637数码管、LCD1602 制作时钟

TM1637库：https://github.com/bremme/arduino-tm1637
DS3231库：https://github.com/adafruit/RTClib

#include <TimerOne.h>
#include "SevenSegmentTM1637.h"
#include "SevenSegmentExtended.h"

#include <Wire.h>
#include "RTClib.h"
#include <LiquidCrystal_I2C.h>
#define TM_CLK_PIN 4
#define TM_DIO_PIN 5

SevenSegmentExtended tm1637(TM_CLK_PIN, TM_DIO_PIN);
RTC_DS3231 rtc;
// set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x3F, 16, 2);  //IIC地址为0x3F
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
const unsigned long interval_time = 1000000;  //1000ms
unsigned long prev_time = 0;
DateTime cur;
byte update;
byte clock_point = 0;
byte cur_hour = 0;
byte cur_minute = 0;
unsigned int cur_year = 2019;
unsigned int cur_month = 1;
unsigned int cur_day = 1;
String lcd_line1;
String lcd_line2;

void setup() {
  Serial.begin(9600);
  delay(3000);  //wait for console opening
  tm1637.begin();
  tm1637.setBacklight(80);  //set the brightness to 80%

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  /*
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__))
             + TimeSpan(0, 0, 0, 25)); */
  if (rtc.lostPower()) {
    Serial.println("RTC lost power, lets set the time!");
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__))
               + TimeSpan(0, 0, 0, 25));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    // rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }
  Timer1.initialize(interval_time);  //1s
  Timer1.attachInterrupt(timing_isr);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Start!");
  delay(2000);
}

void loop() {
  if (update) {
    time_update();
    tm1637.printTime(cur_hour, cur_minute, true);
    lcd_display();
  }
}

void timing_isr() {
  update = 1 - update;
  clock_point = (~clock_point) & 0x01;
}
void time_update() {
  //  if (clock_point) tm1637.point(POINT_ON);
  //  else tm1637.point(POINT_OFF);
  cur = rtc.now();
  //  Serial.println(cur);
  cur_minute = cur.minute();
  cur_hour = cur.hour();
  cur_year = cur.year();
  cur_month = cur.month();
  cur_day = cur.day();
  lcd_line2 = daysOfTheWeek[cur.dayOfTheWeek()];
  lcd_line1 = String("") + cur.year() + "-"
              + (cur_month / 10) + (cur_month % 10) + "-"
              + (cur_day / 10) + (cur_day % 10);
  update = 0;
}

void lcd_display() {
  lcd.setCursor(0, 0);
  lcd.print(lcd_line1);
  lcd.setCursor(4, 1);
  lcd.print(lcd_line2);
}