Save energy by sleeping until it's time to transmit. However, I don't know how this interacts with the web UI.
https://github.com/garrysblog/DS3231-Alarm-With-Adafruit-RTClib-Library/blob/master/DS3231-_RTClib-Adafruit-Alarm-Sleep/DS3231-_RTClib-Adafruit-Alarm-Sleep.ino
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Save energy by sleeping until it's time to transmit. However, I don't know how this interacts with the web UI.
https://github.com/garrysblog/DS3231-Alarm-With-Adafruit-RTClib-Library/blob/master/DS3231-_RTClib-Adafruit-Alarm-Sleep/DS3231-_RTClib-Adafruit-Alarm-Sleep.ino
Sleep until RTC alarmto Sleep until RTC alarm to save power