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Real-Time Clock. Keeps track of current date/time. Some have batteries like the DS3231, and the DS3231 also has programmable alarms that can interrupt an Arduino.
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DS1307RTC Outputting cryptic 165/165/2165 date. What are some possible fixes?
Tried switching to a different RTC but it didn't help. Switching to an Arduino Mega 2560 seems to have resolved it. The Mega 2560 is a lot slower so maybe it was a clock speed issue? … That said, if you always get 165:165 it means your Arduino is not communicating with your RTC. This is a different problem and won't be solved by switching Arduinos. …