Realtime Clock in Arduino: Difference between revisions
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=Internal= | =Internal= | ||
Is shut down if Arduino loses power. Can use 3.7 battery for power. Library is RTC.h. | Arduino has an internal clock. Is shut down if Arduino loses power. Can use 3.7 battery for power. Library is RTC.h. | ||
https://www.arduino.cc/en/Reference/RTC | https://www.arduino.cc/en/Reference/RTC | ||
Power draw for Arduino on standby on 3.7V is about 20ma. So uses about 1.5Whr every 24 hours. | |||
See more about [[Relays#Power Draw]] | |||
=External= | =External= | ||
Latest revision as of 07:13, 19 March 2021
Internal
Arduino has an internal clock. Is shut down if Arduino loses power. Can use 3.7 battery for power. Library is RTC.h.
https://www.arduino.cc/en/Reference/RTC
Power draw for Arduino on standby on 3.7V is about 20ma. So uses about 1.5Whr every 24 hours.
See more about Relays#Power Draw
External
Module is cheap - [1]