rtc function code

Projects Programming
1

Is this correct writing a if statement like that ? ( to do something between 8 and 12 hour with RTC library included)

DateTime now = RTC.now();

if( new.hour >= 8 && new.hour <= 11 ){

//something

}

2

It depends what "new" is. Did you mean "now"? If it is in loop(), it will be performed repeatedly, over and over until the time no longer fits the condition.

3

First, you defined a DateTime object named now, not new. Second, by "in between", do you mean it includes 8 and 12, or excluding those limits? Third, you're checking against 11, not 12 as you suggested.

4

If you read your RTC every 1 second, this will happen on the hour:

if( new.hour >= 8 && new.hour <= 11 && new.second == 0)

5

LarryD:
If you read your RTC every 1 second, this will happen on the hour:

if( new.hour >= 8 && new.hour <= 11 && new.second == 0)

Um, no. Every minute.

6

Eagle eye :confused:

if( new.hour >= 8 && new.hour <= 11 && new.minute == 0 && new.second == 0)

7

aarg:
It depends what "new" is. Did you mean "now"? If it is in loop(), it will be performed repeatedly, over and over until the time no longer fits the condition.

Sorry. I wrote wrong!you were correct, it should be now.hour() instead. I intend keeping a solenoid signal high between 8am and 12h.

But I don´t know how to code if statements hour intervals when the limit hour is not round.

8

econjack:
First, you defined a DateTime object named now, not new. Second, by "in between", do you mean it includes 8 and 12, or excluding those limits? Third, you're checking against 11, not 12 as you suggested.

Econjack, I mean including these limits. Sorry for my english, but the idea is to let the user set the beginning time and then, the shut off time. Ex.: the user needs to feed a solenoid for 4 hours straight. He would set it from 8am to 12.

9

What did you think about the solution posted in reply #5?

10

aarg:
What did you think about the solution posted in reply #5?

LarryD:
Eagle eye :confused:

if( now.hour() >= 8 && now.hour() <= 11 && now.minute() == 0 && now.second() == 0)

I think the solution above only is tue when it is 8:00:0, 9:00:0, 10:00:0 and 11:00:0 due to operator order, isn´t it?

because

11

tue= true

I need to keep a solenoid pin high during certain time while keep doing other things

12 
byte hourMarked;
//...

void loop()
{
  DateTime now = RTC.now();
  if (now.hour > hourMarked)
  {
    hourMarked = now.hour;
    if (now.hour == 8)
    { // turn on relay }
    if (now.hour == 12)
    { // turn off relay }
  }
//...
}