What's the Real Time nowWhat is real time now?
Open the serial console and make sure that the Baudrate is 57600 bauds. You should see the following: The RTC chips will signal time as 0:0:0 whenever they lose any energy (including the back-up battery) and will not record seconds (stopped). Each time you adjust the time, the thrill is triggered and the watch ticks.
The result is that you should never disconnect the rechargeable batteries once you have adjusted the time. This is not necessary and the batterycradle is very tight unless the PCB is squashed, the batterycan not drop out: Println ("RTC does NOT run! "); xxrtc. adjust(DateTime(F(__DATE__), F(__TIME__))))); xx. "RTC does NOT run! " ); xx ), )))); This line is very neat, what makes it the date and time according to the computer you are using (directly when compiling the code) and uses it to programming the ramp.
When the computer time is not correctly adjusted, you should correct it first. Then, you need to click the Upload button to build and then immediately up-load. At this time, when you are compiling and uploading later, the watch is turned off. Open the window Industrial monitors to indicate that the time is adjusted.
You will never have to reset the time again: the batteries last 5 years or more. Well, with the RTC happily ticking, we' ll want to interrogate them for the time being.
There' s just about only one way to determine time with RTClib, calling now(), a feature that will return a DateTime property that specifies the year, months, days, hours, hours, minutes, and seconds when you call calldnow().
Some RTC libs exist that let you call something like RTC instead. year() and RTC. hour() to get the actual year and time. But there is a flaw where if you randomly ask for the exact time at 3:14:59 just before the next minutes overturn, and then the second overturns right after the minutes (i.e. at 3:15:00), you see the time as 3:14:00, which is one less second.
But if you did it the other way around, you could get 3:15:59 - one moment in the other way. Since this is not a very unlikely event - especially if you query the time quite often - we take a "snapshot" of the time from the RTC at once and can then split it into day() or second() as shown above.
It might be useful if you want to keep track of how much time has elapsed since the last request, which makes some mathematics much simpler (like verifying if it was 5 min later just to see if unixtime() has gone up by 300, you don't have to be worried about changing hours).