I want to know if it is possible to set an alarm in DS3231. I want to set the alarm every 6 AM in the morning. Is this possible?
Yes it is (see datasheet datasheet) ... the DS3231 has 2 alarms.
There is also a library for the Arduino, see: library. The alarm(s) can be set (repeatedly) via one of the following functions:
Alarm.alarmRepeat(hours, minutes, seconds, function); Create an alarm that will call a function every day at a particular time. Alarm.alarmRepeat(dayofweek, hours, minutes, seconds, function); Create an alarm that will call a function every week on a specific day at a particular time. "dayofweek" can be dowSunday, dowMonday, dowTuesday, dowWednesday, dowThursday, dowFriday, or dowSaturday.
Detailed info and more functions: link
I find the answer to my question .
I just add
Time t; and
t = rtc.getTime(); into my code then an if statement like this
if (t.hour == 11 && t.min == 59 && t.sec == 00)