The build consists of a Raspberry Pi Pico that connects to a DS3231 ... The RTC has it’s own small power supply, often times from a coin cell battery attached to the module, allowing it to ...

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.