'RTC' was not declared in the scope

Projects Programming
1

Hello ,
I have installed RTC.h , rtc library by V.manjunath. I have this code given below:-

#include <Arduino.h>
#include <avr/wdt.h>
#include <avr/pgmspace.h>
#define SIX 360
#define EIGHTEEN 1077

const int relay1= 9;
const int relay2= 10;
const int led=13;//pin 19 of physical atmega8 chip
 //rtc library by v.manjunath
#include "RTC.h"//rtc library by v.manjunath

void blink(int var)
{ int count=var;
  while (count>0)
    {digitalWrite(led,HIGH);
     delay(500);
     digitalWrite(led,LOW);
     delay(500);
     count=count-1;}
}
// save cumulative days for each month in flash memory 
//const int cumu_days[]PROGMEM  = {0,31,59,90,120,151,181,212,243,273,303,334};
const byte cumu_days[]PROGMEM  = {0,0,15,30,45,60,75,90,106,121,137,151,167};
// save Sunrise and Sunset timings in flash memory
//minutes after 06:00 in morning
const byte sunrise[366]PROGMEM = 
// 1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
{ 74,74,75,75,75,75,76,76,76,76,76,77,77,77,77,77,77,77,77,77,77,77,77,77,76,76,76,76,76,75,75,
  75,75,74,74,74,73,73,72,72,72,71,71,70,70,69,68,68,67,67,66,66,65,64,64,63,62,62,61,
  60,59,59,58,57,56,56,55,54,53,52,52,51,50,49,48,48,47,46,45,44,43,43,42,41,40,39,38,37,37,36,
  35,34,33,32,32,31,30,29,28,28,27,26,25,25,24,23,22,22,21,20,19,19,18,17,17,16,15,15,14,14,
  13,12,12,11,11,10,10,9,9,8,8,8,7,7,6,6,6,5,5,5,5,4,4,4,4,4,3,3,3,3,3,
  3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,5,5,5,5,6,6,6,6,7,
  7,7,8,8,8,9,9,9,10,10,10,11,11,11,12,12,13,13,13,14,14,14,15,15,15,16,16,16,17,17,17,
  18,18,18,19,19,19,20,20,20,21,21,21,21,22,22,22,23,23,23,23,24,24,24,24,24,25,25,25,25,25,26,
  26,26,26,26,27,27,27,27,27,28,28,28,28,28,28,29,29,29,29,29,30,30,30,30,30,30,31,31,31,31,
  31,32,32,32,32,33,33,33,33,34,34,34,34,35,35,35,36,36,36,36,37,37,37,38,38,39,39,39,40,40,41,
  41,42,42,42,43,43,44,44,45,45,46,46,47,47,48,49,49,50,50,51,51,52,53,53,54,54,55,56,56,57,
  58,58,59,59,60,61,61,62,62,63,64,64,65,65,66,67,67,68,68,69,69,70,70,71,71,72,72,72,73,73,74,74};   

//minutes after 18:00 in the evening (actually after 17:57 = 1077 minutes)                                      
const byte sunset[366]PROGMEM = 
//1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 
{14,14,15,15,16,17,17,18,19,19,20,20,21,21,22,23,24,24,25,26,26,27,27,28,29,29,30,30,31,32,32,
 33,33,34,34,35,35,36,36,37,37,38,38,39,39,40,40,41,41,41,42,42,43,43,43,44,44,44,45,
 45,45,46,46,46,47,47,47,48,48,48,48,49,49,49,49,50,50,50,50,51,51,51,51,52,52,52,52,53,53,53,
 53,54,54,54,54,55,55,55,55,56,56,56,56,57,57,57,57,58,58,58,59,59,59,59,60,60,60,61,61,61,
 62,62,62,63,63,63,64,64,65,65,65,66,66,66,67,67,68,68,68,69,69,69,70,70,71,71,71,72,72,73,73,
 73,74,74,74,75,75,75,76,76,76,77,77,77,78,78,78,79,79,79,79,79,80,80,80,80,80,81,81,81,81,
 81,81,81,81,81,81,81,81,81,81,81,81,81,80,80,80,80,80,80,79,79,79,78,78,78,77,77,77,76,76,75,
 75,74,74,73,73,72,72,71,71,70,70,69,68,68,67,66,66,65,64,64,63,62,61,61,60,59,58,57,57,56,55,
 54,53,52,52,51,50,49,48,47,46,46,45,44,43,42,41,40,39,38,38,37,36,35,34,33,32,31,30,30,29,
 28,27,26,25,25,24,23,22,21,20,20,19,18,17,17,16,15,15,14,13,12,12,11,11,10,9,9,8,8,7,7,
 6,6,5,5,4,4,4,3,3,3,2,2,2,1,1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,1,
 1,1,1,1,1,2,2,2,2,3,3,3,4,4,5,5,5,6,6,7,7,8,8,9,9,10,10,11,12,12,13,14};

int hr,minu,sec,date,month,yr;
void setup()
{
//  WDTCR=0x0f;//enable watchdog timer to activate resetting after 2.1 Sec
  pinMode(relay1,OUTPUT);
  pinMode(relay2,OUTPUT);
  pinMode(led,OUTPUT);
  digitalWrite(relay1,LOW);
  digitalWrite(relay2,LOW);


  RTC.begin();
//  RTC.setMinutes(24);
// check the current hr/mth/min parameter and blinks the led (para) times.
//such blinking can be used to read and confirm the calendar data
//  int var=RTC.getMinutes();
//  blink(var);

//If you want to initialize the RTC uncomment the following statements
//and change the time and date as per the current values.
    RTC.setHourMode(CLOCK_H24);
    RTC.setOutPin(SQW001Hz);  //Square wave output with 1 Hz freq
    RTC.setTime(15,17,00);
    RTC.setSeconds();        //set the seconds
    RTC.setMinutes(5);     //set the minutes
    RTC.setHours(9);       //set the hours
    RTC.setDay(21);       //set the date
    RTC.setWeek();  //set the weekday 
    RTC.setMonth(6);        //set the month
    RTC.setYear(2021);         //set the year

  delay(1000);  
}

void loop()
{
  //  byte week,days,total_days ;
  int sunset_min,sunrise_min;
  int total_days,sunset_time,sunrise_time;
  int hrs2min,current_time;
  byte sunset_flag,sunrise_flag;
  
    while(1)
    {      
      
      //now get the date from RTC
        
  date=RTC.getDay();
        month=RTC.getMonth();
//      yr=RTC.getYear();          

//read the cumulative days for the running month      
  total_days = 2*(pgm_read_byte(&(cumu_days[month]))); 

//total_days += date;
  total_days=total_days+date;     
//  int var=total_days;
//  blink(var);
//find Sunset and Sunrise timing
  sunrise_min=pgm_read_byte(&(sunrise[total_days])); 
        sunset_min=pgm_read_byte(&(sunset[total_days])); 
//  int var=sunset_min/4;
//  blink(var);
//find the Sunset and sunrise timings for current day
        sunrise_time = SIX + sunrise_min;
        sunset_time = EIGHTEEN + sunset_min;
          
// get the current time from RTC
          hr=RTC.getHours();
//    blink(hr);  

//now get minutes
          minu=RTC.getMinutes();          
//          sec=RTC.getSeconds();
// Convert the hours to minutes
          hrs2min = 60*hr;
          current_time = hrs2min+minu;
//compare current time with Sunrise and sunset timings
          if(current_time < sunrise_time)          
             sunrise_flag = HIGH;           
          else
            sunrise_flag = LOW;
          if(current_time < sunset_time)
            sunset_flag = HIGH;
          else
            sunset_flag = LOW;
            if((sunset_flag ^ sunrise_flag)== HIGH)
            {
              digitalWrite(relay1,LOW);
              digitalWrite(relay2,LOW);
            }
            else
            {
                digitalWrite(relay1,HIGH);
                digitalWrite(relay2,HIGH); 
            }
            
            delay(1000);        
    }  
             
}

I am getting Compile time error like:-

Arduino: 1.8.12 (Windows 10), Board: "Arduino NG or older, ATmega8"

C:\Users\sakshi\OneDrive\Documents\Arduino\suntime\suntime.ino: In function 'void setup()':

suntime:76:3: error: 'RTC' was not declared in this scope

   RTC.begin();

   ^~~

C:\Users\sakshi\OneDrive\Documents\Arduino\suntime\suntime.ino:76:3: note: suggested alternative: 'RXC'

   RTC.begin();

   ^~~

   RXC

C:\Users\sakshi\OneDrive\Documents\Arduino\suntime\suntime.ino: In function 'void loop()':

suntime:112:8: error: 'RTC' was not declared in this scope

   date=RTC.getDay();

        ^~~

C:\Users\sakshi\OneDrive\Documents\Arduino\suntime\suntime.ino:112:8: note: suggested alternative: 'RXC'

   date=RTC.getDay();

        ^~~

        RXC

exit status 1
'RTC' was not declared in this scope

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

Please help me with the solution.

Uso di RTC.h per ESP32
2

Hello, do yourself a favour and please read How to get the best out of this forum and modify your post accordingly (including code tags and necessary documentation of your ask).

—-
You are missing the RTC variable déclaration

#include <RTC.h>
DS3231 RTC;  // this is missing (use of course the right RTC type)

(Please do fix your post)

4

Thank you so much for the solution .

5

Thanks for keeping the forum tidy !

Have fun

6

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