“RTC 3231”的版本间的差异

/* arduino sketch -- arduino print date and time with ds3231 RTC breakout
   SETUP:
    arduino (UNO R3)     ds3231
      A4/SDA          →    SDA
      A5/SCL          →    SCL
      GND             →    GND
 
   Read More about DS3231: http://www.yfrobot.com/wiki/index.php?title=RTC_3231
 
   BY YFROBOT
*/
 
#include <Wire.h>  // must be incuded here so that Arduino library object file references work
#include <RtcDS3231.h>
 
RtcDS3231 Rtc;
 
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 ------------
  Rtc.Begin();
 
  // 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
 
  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())
  {
    // Common Cuases:
    //    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DS3231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)");
  }
  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 loop ()
{
  if (!Rtc.IsDateTimeValid())
  {
    // Common Cuases:
    //    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();
  printDateTime(now);
  Serial.println();
 
  //输出温度 -- 温度每64秒更新一次 / 精度±3°C
  RtcTemperature temp = Rtc.GetTemperature();
  Serial.print("Temp:");
  Serial.print(temp.AsFloat());
  Serial.println("C");
 
  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);
}