Wake up from deep sleep(Standby mode with DS3231)

[ZX80]

Another option maybe

Switching power with a DS3231 RTC module

The basic idea is to switch on the power to a microcontroller project periodically using the alarm function of a DS3231 which is running on its 3V coin cell. This could be useful in battery-powered projects where there are other devices such as sensors or SD cards that can't be put to sleep along with the processor. I just wanted to present some schematics showing how this could be set up. It's the INT/SQW pin of the RTC module that controls the power. And in all cases it's necessary to disconn…