It was starting with experimenting with a RTC Module DS3231 and a UNO.Why the DS3231 ?The DS3231 is a low-cost, extremely accurate I2C real-time clock with an integrated temperature-compensated crystal oscillator
The Rodan Library :I was choosing the Rodan Library because it has a good support for setting the date, time with the IDE Serial monitor, see the line// TssmmhhWDDMMYYYY aka set timejust type T005710418012023 + SEND ( Set Terminate to CR ) in the Serial Monitor to setthe Time to 10h57:00 and the date to Wed January 18, 2023
setting Time, Date in Serial Monitor
Making it work with 3VAfter experimenting withe the UNO, I was porting it on a Pro-Mini 3V, so It can be powered by the same CR2032
Breadboard Prototype
Shrinking it down to a small PCB
ArduWatch PCB
et voilà !
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