However, additional components -- a Wi-Fi shield and a Bluetooth module ... RTC, you may need to use a separate supply for this device to ensure it functions as intended even when the Arduino ...

[RedruM69] recently ran into a system with a dead Real Time Clock (RTC) module. These modules were used on computers and all sorts of other equipment, storing time, date, and 100 or so bytes of ...

The build relies on that old stalwart, the Arduino Uno, to run the show. It’s hooked up to a DS3231 real-time clock module so it can keep accurate time for long periods, as is befitting a clock.