RTC and Interval Timing

Projects Programming
25

So I'm breaking down my new program into chunks and am currently writing the chunk that will:

  1. set RTC time
  2. read RTC time and serial print (soon to be lcd print when my new lcd comes in the mail)
  3. activate relay based on "minutes" data

The program works in that it will set time and print time but I am getting an error whenever I try to write code to activate the relay. Perhaps somebody can look at the code so far and enlighten me on the error that I keep getting.

#include <Time.h>
#include <Wire.h>
#include <DS3231RTC.h> // A simple DS3231 Library meant for use with Time.h also implements temp readings
 
const int RELAY1 = 22;
const int RELAY2 = 23;
const int RELAY3 = 24;
const int RELAY4 = 25;


void setup() {
 Serial.begin(9600);
 setTime(10,1,0,9,14,16);
}
 
void loop()
{
 digitalClockDisplay();
 delay(1000);
}
 
void digitalClockDisplay(){
 // digital clock display of the time
 Serial.print(hour());
 printDigits(minute());
 printDigits(second());
 Serial.print(" ");
 Serial.print(day());
 Serial.print(" ");
 Serial.print(month());
 Serial.print(" ");
 Serial.print(year());
 Serial.print(" ");
 Serial.print(RTC.getTemp()); //These last few lines are the only other change to the the Time.h example!
 Serial.print((char)223);
 Serial.print('C');
 Serial.println();
}
 
void printDigits(int digits){
 // utility function for digital clock display: prints preceding colon and leading 0
 Serial.print(":");
 if(digits < 10)
 Serial.print('0');
 Serial.print(digits);
}

void fanTimer(){
      if ( minute >= 0 && minute < 5)
{
  digitalWrite ( RELAY2, HIGH );
}
else 
{
 digitalWrite ( RELAY2, LOW );
}
}

ERROR:

sketch_sep14c.ino: In function 'void fanTimer()':
sketch_sep14c.ino:49:22: error: invalid operands of types '' and 'int' to binary 'operator>='
sketch_sep14c.ino:49:36: error: invalid operands of types '' and 'int' to binary 'operator<'
Error compiling.