101 lines
2.3 KiB
C++
101 lines
2.3 KiB
C++
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// CONNECTIONS:
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// DS1302 CLK/SCLK --> 5
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// DS1302 DAT/IO --> 4
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// DS1302 RST/CE --> 2
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// DS1302 VCC --> 3.3v - 5v
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// DS1302 GND --> GND
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#include <RtcDS1302.h>
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ThreeWire myWire(4,5,2); // IO, SCLK, CE
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RtcDS1302<ThreeWire> Rtc(myWire);
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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.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 Causes:
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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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Rtc.SetDateTime(compiled);
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}
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if (Rtc.GetIsWriteProtected())
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{
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Serial.println("RTC was write protected, enabling writing now");
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Rtc.SetIsWriteProtected(false);
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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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}
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void loop ()
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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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if (!now.IsValid())
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{
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// Common Causes:
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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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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[26];
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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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