I would like to understand is it a way to power internal RTC from the battery (e.g. CR2032) on the new ESP32-WROOM-32E, to guarantee that internal RTC will work if 220V power is down? It's a pity that we must use an additional RTC chip and external crystal clock while ESP32-WROOM-32E already has the...

Hi, colleagues,

I made a review on how to use MAX3485 based board with HardwareSerial on the ESP32. Here it is http://www.bizkit.ru/en/2019/02/11/12251/
RS485 board base on MAX485 works perfect with the ESP32.