124 lines
3.3 KiB
C++
124 lines
3.3 KiB
C++
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// CONNECTIONS:
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// DS3231 SDA --> SDA
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// DS3231 SCL --> SCL
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// DS3231 VCC --> 3.3v or 5v
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// DS3231 GND --> GND
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/* for software wire use below
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#include <SoftwareWire.h> // must be included here so that Arduino library object file references work
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#include <RtcDS3231.h>
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SoftwareWire myWire(SDA, SCL);
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RtcDS3231<SoftwareWire> Rtc(myWire);
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for software wire use above */
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/* for normal hardware wire use below */
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#include <Wire.h> // must be included here so that Arduino library object file references work
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#include <RtcDS3231.h>
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RtcDS3231<TwoWire> Rtc(Wire);
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/* for normal hardware wire use above */
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void setup ()
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{
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Serial.begin(57600);
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Serial.print("compiled: ");
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Serial.print(__DATE__);
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Serial.println(__TIME__);
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//--------RTC SETUP ------------
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// if you are using ESP-01 then uncomment the line below to reset the pins to
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// the available pins for SDA, SCL
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// Wire.begin(0, 2); // due to limited pins, use pin 0 and 2 for SDA, SCL
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Rtc.Begin();
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RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);
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printDateTime(compiled);
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Serial.println();
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if (!Rtc.IsDateTimeValid())
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{
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// Common Cuases:
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// 1) first time you ran and the device wasn't running yet
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// 2) the battery on the device is low or even missing
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Serial.println("RTC lost confidence in the DateTime!");
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// following line sets the RTC to the date & time this sketch was compiled
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// it will also reset the valid flag internally unless the Rtc device is
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// having an issue
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Rtc.SetDateTime(compiled);
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}
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if (!Rtc.GetIsRunning())
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{
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Serial.println("RTC was not actively running, starting now");
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Rtc.SetIsRunning(true);
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}
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RtcDateTime now = Rtc.GetDateTime();
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if (now < compiled)
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{
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Serial.println("RTC is older than compile time! (Updating DateTime)");
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Rtc.SetDateTime(compiled);
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}
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else if (now > compiled)
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{
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Serial.println("RTC is newer than compile time. (this is expected)");
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}
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else if (now == compiled)
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{
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Serial.println("RTC is the same as compile time! (not expected but all is fine)");
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}
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// never assume the Rtc was last configured by you, so
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// just clear them to your needed state
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Rtc.Enable32kHzPin(false);
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Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeNone);
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}
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void loop ()
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{
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if (!Rtc.IsDateTimeValid())
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{
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// Common Cuases:
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// 1) the battery on the device is low or even missing and the power line was disconnected
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Serial.println("RTC lost confidence in the DateTime!");
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}
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RtcDateTime now = Rtc.GetDateTime();
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printDateTime(now);
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Serial.println();
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RtcTemperature temp = Rtc.GetTemperature();
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temp.Print(Serial);
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// you may also get the temperature as a float and print it
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// Serial.print(temp.AsFloatDegC());
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Serial.println("C");
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delay(10000); // ten seconds
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}
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#define countof(a) (sizeof(a) / sizeof(a[0]))
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void printDateTime(const RtcDateTime& dt)
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{
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char datestring[20];
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snprintf_P(datestring,
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countof(datestring),
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PSTR("%02u/%02u/%04u %02u:%02u:%02u"),
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dt.Month(),
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dt.Day(),
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dt.Year(),
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dt.Hour(),
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dt.Minute(),
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dt.Second() );
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Serial.print(datestring);
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}
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