“RTC 1307”的版本间的差异

/* arduino sketch -- arduino print date and time with ds1307 RTC breakout
   SETUP:
    arduino (UNO R3)     ds1307
      A4/SDA          →    SDA
      A5/SCL          →    SCL
      GND             →    GND
 
   Read More about DS1307: http://www.yfrobot.com.cn/wiki/index.php?title=RTC_1307
 
   BY YFROBOT
*/
 
#include <Wire.h>  // must be incuded here so that Arduino library object file references work
#include <RtcDS1307.h>
 
RtcDS1307<TwoWire> Rtc(Wire);
 
void setup () {
  Serial.begin(115200);
 
  Serial.print("compiled: ");
  Serial.print(__DATE__);      // 编译文档的日期
  Serial.println(__TIME__);    // 编译文档的时间
 
  //--------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__); // 存储当前编译的时间及日期并打印
  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
      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
 
      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();  // 获取当前DS1307时间及日期
  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)");
    // Rtc.SetDateTime(compiled);
  } else if (now == compiled) {
    Serial.println("RTC is the same as compile time! (not expected but all is fine)");
  }
}
 
void loop () {
  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
      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
      Serial.println("RTC lost confidence in the DateTime!");
    }
  }
 
  RtcDateTime now = Rtc.GetDateTime();  // 获取当前DS1307时间及日期
  printDateTime(now);   // 串口打印日期时间
  Serial.println();
 
  delay(10000); // ten seconds
}
 
#define countof(a) (sizeof(a) / sizeof(a[0]))
 
// 串口打印日期时间
void printDateTime(const RtcDateTime& dt) {
  char datestring[20];
 
  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.print(datestring);
}