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197 lines
5.7 KiB
197 lines
5.7 KiB
// CONNECTIONS:
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// DS1307 SDA --> SDA
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// DS1307 SCL --> SCL
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// DS1307 VCC --> 5v
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// DS1307 GND --> GND
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#define countof(a) (sizeof(a) / sizeof(a[0]))
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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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#include <EepromAT24C32.h>
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SoftwareWire myWire(SDA, SCL);
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RtcDS1307<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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#include <EepromAT24C32.h>
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RtcDS3231<TwoWire> Rtc(Wire);
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EepromAt24c32<TwoWire> RtcEeprom(Wire);
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// if you have any of the address pins on the RTC soldered together
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// then you need to provide the state of those pins, normally they
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// are connected to vcc with a reading of 1, if soldered they are
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// grounded with a reading of 0. The bits are in the order A2 A1 A0
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// thus the following would have the A2 soldered together
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// EepromAt24c32<TwoWire> RtcEeprom(Wire, 0b011);
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/* for normal hardware wire use above */
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// nothing longer than 32 bytes
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// rtc eeprom memory is 32 byte pages
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// writing is limited to each page, so it will wrap at page
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// boundaries.
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// But reading is only limited by the buffer in Wire class which
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// by default is 32
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const char data[] = "What time is it in Greenwich?";
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const uint16_t stringAddr = 64; // stored on page boundary
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void printDateTime(const RtcDateTime& dt);
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void setup ()
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{
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Serial.begin(9600);
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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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RtcEeprom.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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if (Rtc.LastError() != 0)
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{
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// we have a communications error
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// see https://www.arduino.cc/en/Reference/WireEndTransmission for
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// what the number means
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Serial.print("RTC communications error = ");
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Serial.println(Rtc.LastError());
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}
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else
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{
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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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}
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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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// 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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/* comment out on a second run to see that the info is stored long term */
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// Store something in memory on the Eeprom
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// store starting address of string
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RtcEeprom.SetMemory(0, stringAddr);
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// store the string, nothing longer than 32 bytes due to paging
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uint8_t written = RtcEeprom.SetMemory(stringAddr, (const uint8_t*)data, sizeof(data) - 1); // remove the null terminator strings add
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// store the length of the string
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RtcEeprom.SetMemory(1, written); // store the
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/* end of comment out section */
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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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if (Rtc.LastError() != 0)
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{
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// we have a communications error
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// see https://www.arduino.cc/en/Reference/WireEndTransmission for
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// what the number means
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Serial.print("RTC communications error = ");
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Serial.println(Rtc.LastError());
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}
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else
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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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}
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RtcDateTime now = Rtc.GetDateTime();
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printDateTime(now);
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Serial.println();
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delay(5000);
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// read data
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// get the offset we stored our data from address zero
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uint8_t address = RtcEeprom.GetMemory(0);
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if (address != stringAddr)
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{
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Serial.print("address didn't match ");
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Serial.println(address);
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}
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{
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// get the size of the data from address 1
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uint8_t count = RtcEeprom.GetMemory(1);
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uint8_t buff[64];
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// get our data from the address with the given size
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uint8_t gotten = RtcEeprom.GetMemory(address, buff, count);
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if (gotten != count ||
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count != sizeof(data) - 1) // remove the extra null terminator strings add
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{
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Serial.print("something didn't match, count = ");
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Serial.print(count, DEC);
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Serial.print(", gotten = ");
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Serial.print(gotten, DEC);
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Serial.println();
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}
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Serial.print("data read (");
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Serial.print(gotten);
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Serial.print(") = \"");
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for (uint8_t ch = 0; ch < gotten; ch++)
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{
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Serial.print((char)buff[ch]);
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}
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Serial.println("\"");
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}
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delay(5000);
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}
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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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} |