System
This shows the basic system before assembly into the enclosure.
System is showing no drop-outs so only displays the current time. Green LED below display indicates mains activity (present = ON, absent = OFF).
Lithium Poly battery provides power to run the Arduino during mains outages and a 1F super cap provides backup power for the Dallas RTC chip. The RTC chip runs off main battery until it is flat at which point the supercap takes over.
System
This shows the basic system before assembly into the enclosure.
System is showing no drop-outs so only displays the current time. Green LED below display indicates mains activity (present = ON, absent = OFF).
Lithium Poly battery provides power to run the Arduino during mains outages and a 1F super cap provides backup power for the Dallas RTC chip. The RTC chip runs off main battery until it is flat at which point the supercap takes over.