Once the power is turned off (manually or due to power outage), all the timers are reset to 0. they run as long as there is power supply. Real Time Clock ICs are present in computers, servers, many embedded systems and in fact they are used wherever it is required to keep an accurate time.Īlso read: ARDUINO ALARM CLOCK Why do we need a Real Time Clock (RTC)?Įven though Arduino and almost all microcontrollers have built-in timers and timekeepers (millis () in case of Arduino), they are power dependent i.e. An RTC is battery powered and keeps track of the current time even when there is no power. Working of Arduino Real Time Clock DS1307 InterfaceĪn RTC or Real Time Clock is a Timekeeping device, usually in the form of an Integrated Circuit (IC).Arduino Real Time Clock DS1307 Interface.Why do we need a Real Time Clock (RTC)?.
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