Remaining seconds till next 7AM

Hi all!

My doughter has trouble sleeping. She always comes tot he bed.. so I would like to build a visual countdown, that shows her how long it is till the end of the night. Usually she wakes up aroudn 5Pm. thats almost the end of the night.. :slight_smile:

I would like to display this with a digital ledstrip. the more lights are on and the longer the night lasts.

What I would need is the remaining seconds till 7am. I am able to get day of week, hours, minutes etc.. with the NTP client lib, but I would need to get the seconds till 7Am.. how can I do this?

Thank you all!

Best regards

Igor

You know the time NOW, you know if you are before midnight or after, you know how meny Seconds are in a minute, and an hour. Simple maths from that point.

Or find someone who did already, google

 arduino seconds between two times

looked like you could find something to steal borrow.

wheel invented already...

a7

Hi,

How about this topic?

// For this to work,
// you need variables hh, mi, ss to contain current hours, minutes, seconds

// calculate seconds since midnight
long secondsSinceMidnight = (hh * 3600L) + (mi * 60L) + ss;

// calculate the number of seconds to go
long secondsToGo = (7 * 3600L) - secondsSinceMidnight;

// As long as we restrict ourselves to times between 00:00 and 07:00,
// our secondsToGo calculation will be correct.
// However, for times in the evening, such as 20:00 or 23:00,
// the result will not be what we want. We need a fix for evening times.
// This fix will cause our countdown to restart 8 hours after the wake-up time. 
// So, our countdown will start at 15:00, with 16 hours remaining.

// Fix for evening times:
if (secondsToGo < ((-8) * 3600L)) {
  // add 24 hours worth of seconds
  secondsToGo += (24 * 3600L);
} 

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