Function TIME

[AgustinRolla]

Is it possible to obtain only the time data? because I need to use them in a conditional to fire a relay ssr and it is not taking the data in the correct way (or that is what I think)

[Makuna]

Do you have a code snippit of how you are currently using it? How are you using it in your conditionals?

By "time data", what do you mean? Just time of day and not the date?

[AgustinRolla]

Sorry for my bad english. I need to control a relay ssr with the time for a terrarium. I just need to get the value of hour but i cant extract it from the datestring, i don't know why.

Do you have discord? i you want, we made a call cause i have a lot a problem with this.

This code is after the setup but doesn't work. If you wanted, i'll send you the whole code but is so long.

{
  char datestring[20];
  char datestring1[20];

  snprintf_P(datestring,
             countof(datestring),
             PSTR("%02u/%02u   %02u:%02u:%02u"),
             dt.Day(),
             dt.Month(),
             dt.Hour(),
             dt.Minute(),
             dt.Second()
            );

  snprintf_P(datestring1,
             countof(datestring),
             PSTR("%02u/%02u/%04u %02u:%02u:%02u"),
             dt.Day(),
             dt.Month(),
             dt.Year(),
             dt.Hour(),
             dt.Minute(),
             dt.Second()
            );

  Serial.print(datestring1);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(datestring);

  lcd.setCursor(1, 1);
  lcd.write(1);
  lcd.setCursor(3, 1);
  
  lcd.print(float(temp), 0);
  lcd.print((char)223); //degree sign
  lcd.print("C");

  lcd.setCursor(10, 1);
  lcd.write(2);
  lcd.setCursor(12, 1);
  lcd.print(float(hume), 0);
  lcd.print("%");
  
  int hora = dt.Hour();
  int minuto = dt.Minute();
  int segundo = dt.Second();
  
  Serial.println("\n");

  //CONTROL TUVO LUZ Y LAMPARA DE CALOR CON RELAY
  //DIA
  if ((hora >= 8 && minuto >= 0 && segundo >= 0) && (hora < 21)) {
    //digitalWrite(LED_BUILTIN, HIGH);// turn the LED on (HIGH is the voltage level)
    digitalWrite(LUZUVB, HIGH); //TUBO UVB ENCENDIDO
    Serial.println("TUBO PRENDIDO 0: ");
    //Serial.print(datestring1);
    
    if (temp >= 35) {
      //digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
      digitalWrite(CALOR, LOW); //LAMPARA CALOR APAGADA
      Serial.println("LAMPARA APAGADA 1: ");
      //Serial.print(datestring1);
    } else{
      //digitalWrite(LED_BUILTIN, HIGH);    // turn the LED off by making the voltage LOW
      digitalWrite(CALOR, HIGH); //LAMPARA CALOR PRENDIDA
      Serial.println("LAMPARA PRENDIDA 2: ");
      
    }
  //CONTROL TUVO LUZ Y LAMPARA DE CALOR
  //NOCHE
  } else if ((hora >= 21 && minuto >= 0 && segundo >= 0) || (hora < 8) ) {
    //digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
    digitalWrite(LUZUVB, LOW); //TUBO UVB APAGADO
    Serial.println("TUBO APAGADO 3: ");
    //Serial.print(datestring1);
    if (temp >= 25) {
      //digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
      digitalWrite(CALOR, LOW); //LAMPARA CALOR APAGADA
      Serial.println("LAMPARA APAGADA 4: ");
      //Serial.print(datestring1);
    } else if (temp <= 20) {
      //digitalWrite(LED_BUILTIN, HIGH);    // turn the LED off by making the voltage LOW
      digitalWrite(CALOR, HIGH); //LAMPARA CALOR PRENDIDA
      Serial.println("LAMPARA PRENDIDA 5: ");
      //Serial.print(datestring1);
    }
  }```````

[Makuna]

And what do you see going wrong? Debug output?
How often are you calling the above code? Where does dt variable get defined and get set?

while nothing specifically is wrong with

if ((hora >= 8 && minuto >= 0 && segundo >= 0) && (hora < 21)) {
// use higher temps
} else if ((hora >= 21 && minuto >= 0 && segundo >= 0) || (hora < 8) ) {
// use lower temps
}

It really could be more succinct coded like the following as minutes and seconds will always be greater than or equal to zero.

if (hora >= 8 && hora < 21) {
// use higher temps
} else  {
// use lower temps
}