* Using rtc.lostPower() with DS1307 might not work correctly because it doesn't have the lostPower feature. * Using !rtc.isrunning() with DS3231 might not effectively check for power loss, and you may ...

The RTC DS 3231 (which works on the I2C protocol) is used to wake up Arduino UNO board from sleep using an interrupt. When the alarm occurs an interrupt is being triggered on the INT pin of the RTC ...

We're building an Arduino automatic pet feeder today that feeds your pet automatically at scheduled times. This complete automatic pet feeder project incorporates a DS3231 RTC (Real Time Clock) Module ...