ds3231

I don't know if I'm posting it in the right place or not, so, sorry about that, but there is a question regarding the DS3231 module, why there is a connection between VCC and VBAT using a 220 Ohm resistor and the 1N4148 Diode, why is that so, what if someone drop those parts for the sake of...

Hi everyone, I’m seeking guidance. I have a tricky situation which I don’t really know how to get out of. I want to design a system which would consume the least amount of power possible. The idea is to have an ESP8266 do a simple task every minute (updating a e-paper display) and sleep the...