DS1302_HourlyPiezoTweet.ino

  /* 
Modified on Nov 25, 2020
Modified by MehranMaleki from Arduino Examples
https://electropeak.com/learn/interfacing-ds1302-real-time-clock-rtc-module-with-arduino/
RTC module with CR2032 coin battery
Piezo addition by Suren(Sroto&Gargees) on Oct 23,2022
Library: RTC by Makuna
*/


// CONNECTIONS:
// DS1302 CLK/SCLK --> 5
// DS1302 DAT/IO --> 4
// DS1302 RST/CE --> 2
// DS1302 VCC --> 3.3v - 5v
// DS1302 GND --> GND
// Piezo  VCC --> 3 
// Piezo  GND --> GND
// Add Display --> LCD,Led matrix,OLED..etc

#include <ThreeWire.h>  
#include <RtcDS1302.h>

const int P= 3; //Piezo VCC
int f= 4000;    //Piezo Frequency 

ThreeWire myWire(4,5,2); // IO, SCLK, CE
RtcDS1302<ThreeWire> Rtc(myWire);

void setup () 
{
    Serial.begin(9600);
    pinmode(P,OUTPUT);    // Piezo init
    Serial.print("compiled: ");
    Serial.print(__DATE__);
    Serial.println(__TIME__);

    Rtc.Begin();

    RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);
    printDateTime(compiled);
    Serial.println();

    if (!Rtc.IsDateTimeValid()) 
    {
        // 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!");
        Rtc.SetDateTime(compiled);
    }

    if (Rtc.GetIsWriteProtected())
    {
        Serial.println("RTC was write protected, enabling writing now");
        Rtc.SetIsWriteProtected(false);
    }

    if (!Rtc.GetIsRunning())
    {
        Serial.println("RTC was not actively running, starting now");
        Rtc.SetIsRunning(true);
    }

    RtcDateTime now = Rtc.GetDateTime();
    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)");
    }
}

void loop () 
{
    RtcDateTime now = Rtc.GetDateTime();

    printDateTime(now);
    Serial.println();

    if (!now.IsValid())
    {
        // 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!");
    }

    delay(1000); // 1 seconds
}

#define countof(a) (sizeof(a) / sizeof(a[0]))

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);

if (dt.Minute()==00 && dt.Second()==00){
tone(P,f);delay(50);notone(P);delay(50);
tone(P,f);delay(50);notone(P);}  // Beep twice hourly 

if (dt.Minute()==30 && dt.Second()==00){
tone(P,f);delay(50);notone(P);}  // Once every 30 min

}

//End of code