Large size digital tube clock base with arduino uno

//**************************************************************//
//  Name    : 大号数码管时钟                        //
//  Author  : HOROLD FINCH                               //
//  Date    : 25 ApRIL, 2006                                      //
//  Version : 1.0                                               //
//  Notes   : 74HC595驱动 ULN2003驱动数码管          //
//          :                          //
//****************************************************************
#include <Wire.h> // must be included here so that Arduino library object file references work
#include <RtcDS3231.h>
RtcDS3231<TwoWire> Rtc(Wire);

#define latchPin 8
#define clockPin 9
#define dataPin  7
#define siteselection LOW //for PNPBJT is HIHG，for NPNBJT is low
#define countof(a) (sizeof(a) / sizeof(a[0]))
#define colol 2

int DIG1  = 6;
int DIG2 = 5;
int DIG3 = 4;
int DIG4 = 3;

int displays[] = {0X77, 0X41, 0X6E, 0X6B, 0XD9, 0X3B, 0X3F, 0X61, 0X7F, 0X7B, 0XFF, 0X00, 0X3E, 0XC, 0X78, 0X36, 0x8};
                 //0      1    2       3     4     5     6     7   8     9    全部  全不   E      r     口    C   负号
void setup() {
  Serial.begin(9600);
  //set pins to output because they are addressed in the main loop
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode (DIG1, OUTPUT);
  pinMode (DIG2, OUTPUT);
  pinMode (DIG3, OUTPUT);
  pinMode (DIG4, OUTPUT);
  pinMode (colol, OUTPUT);
  for (int i = 15; i > 0; i--) {
    SegPlayall(200 * (i / 5));
    SegUnplayall(200 * (i / 5));
  }
  ds3231config();
}

void loop() {
  checkds3231();
  RtcDateTime now = Rtc.GetDateTime();
  printDateTime(now);

  RtcTemperature temp = Rtc.GetTemperature();
  //temp.Print(Serial);
  // you may also get the temperature as a float and print it
  //  Serial.print(temp.AsFloatDegC());
  //  Serial.println("C");
  playtemperature(temp.AsFloatDegC(), 1500);
}

/////////////////////////////////////////
//函数作用：用于四位数码管显示数字
//输入值：unsigned int 范围0-9999      //
//返回值： 无                          //
////////////////////////////////////////
void playnum (unsigned int i, unsigned int playtime) {
  for (int j = 0; j < playtime / 4; j++) {
    SegDisplay(i / 1000, DIG1);
    SegDisplay((i % 1000) / 100, DIG2);
    SegDisplay((i % 100) / 10, DIG3);
    SegDisplay((i % 10), DIG4);
  }
}

/////////////////////////////////////////
//函数作用：用于四位数码管显示温度，后面两位是℃
//输入值：float值 temp.AsFloatDegC()，unsigned int 范围0-9999      //
//返回值： 无                          //
////////////////////////////////////////
void playtemperature (float temp, unsigned int playtime) {
  if (temp < 0) {//这里判断以下温度是不是负数，如果是负数，就显示负号。缺点是只能显示到-9℃。但是室温一般不会到-9℃，所以无妨。
    for (int j = 0; j < playtime / 4; j++) {
      int i = -temp;                //需要转化类型，不然后不能取余
      SegDisplay( 16, DIG1);//显示负号
      SegDisplay( i , DIG2);//不用
      SegDisplay(14, DIG3);
      SegDisplay(15, DIG4);
    }
  }
  else{
  for (int j = 0; j < playtime / 4; j++) {
    int i = temp;                //需要转化类型，不然后不能取余
    SegDisplay( i / 10, DIG1);
    SegDisplay( i % 10, DIG2);
    SegDisplay(14, DIG3);
    SegDisplay(15, DIG4);
  }
  }
}

/////////////////////////////////////////
//函数作用：用于四位数码管显示温度，后面两位是℃
//输入值：float值 temp.AsFloatDegC()，unsigned int 范围0-9999      //
//返回值： 无                          //
////////////////////////////////////////
void playerror (int i , unsigned int playtime) {
  for (int j = 0; j < playtime / 4; j++) {
    SegDisplay(12, DIG1);
    SegDisplay(13, DIG2);
    SegDisplay(13, DIG3);
    SegDisplay(i, DIG4);
  }
}

/////////////////////////////////////////
//函数作用：用于单位数码管显示数字
//输入值：i 范围0-11     //
//        显示位置 1-4   //
//返回值： 无                          //
////////////////////////////////////////
void SegDisplay(int i, int DIG) {
  digitalWrite(latchPin, LOW);
  shiftOut(dataPin, clockPin, LSBFIRST, displays[i]);
  digitalWrite(latchPin, HIGH);
  digitalWrite(DIG, ~siteselection);
  delayMicroseconds(500);//调节这个和下面的参数可以调整显示亮度，建议这两个数加起来为860。这样是为了显示时间准确
  digitalWrite(DIG, siteselection);
  delayMicroseconds(360);
}
/////////////////////////////////////////
//函数作用：显示全部笔端
//输入值：显示时间 unsigned int     //
//返回值： 无                          //
////////////////////////////////////////
void SegPlayall(unsigned int playtime) {
  for (int j = 0; j < playtime / 4; j++) {
    SegDisplay(10, DIG1);
    SegDisplay(10, DIG2);
    SegDisplay(10, DIG3);
    SegDisplay(10, DIG4);
    digitalWrite(colol, HIGH);
  }
}
/////////////////////////////////////////
//函数作用：不显示全部笔端
//输入值：显示时间 unsigned int     //
//返回值： 无                          //
////////////////////////////////////////
void SegUnplayall(unsigned int playtime) {
  for (int j = 0; j < playtime / 4; j++) {
    SegDisplay(11, DIG1);
    SegDisplay(11, DIG2);
    SegDisplay(11, DIG3);
    SegDisplay(11, DIG4);
    digitalWrite(colol, LOW);
  }
}
void ds3231config() {
  Serial.print("compiled: ");
  Serial.print(__DATE__);
  Serial.println(__TIME__);

  //--------RTC SETUP ------------
  // if you are using ESP-01 then uncomment the line below to reset the pins to
  // the available pins for SDA, SCL
  // Wire.begin(0, 2); // due to limited pins, use pin 0 and 2 for SDA, SCL

  Rtc.Begin();

  RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);
  //printDateTime(compiled);
  Serial.println();

  if (!Rtc.IsDateTimeValid())
  {
    if (Rtc.LastError() != 0)
    {
      // we have a communications error
      // see https://www.arduino.cc/en/Reference/WireEndTransmission for
      // what the number means
      //0: success
      //1: data too long to fit in transmit buffer
      //2: received NACK on transmit of address
      //3: received NACK on transmit of data
      //4: other error
      playerror(Rtc.LastError(), 2000);
      // Serial.print("RTC communications error = ");
      // Serial.println(Rtc.LastError());
    }
    else
    {
      // Common Causes:
      //    1) first time you ran and the device wasn't running yet
      //    2) the battery on the device is low or even missing
      playerror(5, 2000);
      //Serial.println("RTC lost confidence in the DateTime!");

      // following line sets the RTC to the date & time this sketch was compiled
      // it will also reset the valid flag internally unless the Rtc device is
      // having an issue

      Rtc.SetDateTime(compiled);
    }
  }

  if (!Rtc.GetIsRunning())
  {
    Serial.println("RTC was not actively running, starting now");
    Rtc.SetIsRunning(true);
  }

  RtcDateTime now = Rtc.GetDateTime();
  if (now < compiled)
  {
    Serial.println("RTC is older than compile time!  (Updating DateTime)");
    Rtc.SetDateTime(compiled);
  }
  else if (now > compiled)
  {
    Serial.println("RTC is newer than compile time. (this is expected)");
  }
  else if (now == compiled)
  {
    Serial.println("RTC is the same as compile time! (not expected but all is fine)");
  }

  // never assume the Rtc was last configured by you, so
  //  // just clear them to your needed state
  //  Rtc.Enable32kHzPin(false);
  //  Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeNone);
}
void checkds3231() {
  if (!Rtc.IsDateTimeValid())
  {
    if (Rtc.LastError() != 0)
    {
      // we have a communications error
      // see https://www.arduino.cc/en/Reference/WireEndTransmission for
      // what the number means
      //0: success
      //1: data too long to fit in transmit buffer
      //2: received NACK on transmit of address
      //3: received NACK on transmit of data
      //4: other error
      playerror(Rtc.LastError(), 2000);
      //  Serial.print("RTC communications error = ");
      //  Serial.println(Rtc.LastError());
    }
    else
    {
      // Common Causes:
      //    1) the battery on the device is low or even missing and the power line was disconnected
      playerror(5, 2000);
      //   Serial.println("RTC lost confidence in the DateTime!");
    }
  }
}

void printDateTime(const RtcDateTime& dt)
{
  char datestring[20];
  String Timesrtring;

  snprintf_P(datestring,
             countof(datestring),
             PSTR("%02u/%02u/%04u %02u:%02u:%02u"),
             dt.Month(),
             dt.Day(),
             dt.Year(),
             dt.Hour(),
             dt.Minute(),
             dt.Second() );
  Serial.println(datestring);
  Timesrtring = datestring[11];     //不能通过  Timesrtring=datestring[11]+datestring[12];这种运算得到一个字符串
  Timesrtring = Timesrtring + datestring[12];
  Timesrtring = Timesrtring + datestring[14];
  Timesrtring = Timesrtring + datestring[15];
  //  Serial.println(Timesrtring);
  //  Serial.println(Timesrtring.toInt());     //toInt()函数将字符串转化为int
  digitalWrite(colol, HIGH);
  playnum(Timesrtring.toInt(), 1500);
  digitalWrite(colol, LOW);
}