Hi
System is based on ESP32 Module 12F with wifi. (DOITING ESP-12F )
My finished Arduino project runs stable as long as I dont take main power 230 V
When power off, 230V, then when power back system dont load.
Only stable way to restart is to disconnect USB cable then reconnect USB.
System is powered with a USB charger.
Is there a way to force system to reboot safe when mains powers goes on after a off?
Thanks up front!
An ESP-12F is usually an ESP8266 and not an ESP32. Post a link to the actual product you're using!
Most probably this is caused by that USB charger but you failed to provide a link to it, so we're not able to check that.
If you pull that USB charger out of the mains and don't reconnect for one minute. After that you reconnect to the mains. Does the ESP start correctly in this case?
I will take a SWAG and say the rise time of the power supply is to slow. Try a different one.
Hi
thanks for answer.
I will try a new USB charger. The one I used is an older USB charger, I will use a newer that is a super charger from my Oppo mobile.
GIve feedbac to you when I have done the job.
Answer Please???
Hi, have been on vacation, so slow answer.
I used a USB charger from my Oppo smart phone, a strong charger. Same happened, did have to press reset after power off 
hmmmmmmmmmmmmmmmmmmmm what board you use 1:UNO/NANO 2:Mega/Due
Phone chargers must provide much current but don't have to have a small rise time. Have you tried a Raspberry Pi power supply? I would expect them to be faster.
Hi
I dont have a Raspberey PI power supply. I may have a supply from a Arduino newbeginner kit. I will try it.
The board i use is a WeMos D1 mini Pro (or a clone, don't remember exactly, and now I cant read it due to soldered to a PCB board):
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