Hello everyone.
Suddenly my ESP32 can’t connect to the internet anymore.
I get the following error message:
Anyone have an idea?
Thanks for your response.
Looks like your power supply is too weak.
“Brownout detector was triggered.”
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Brownout detector - that sounds like insufficient power. Maybe change the power supply, or if it a cheap ESP then you may have a faulty regulator.
Thanks for your reply. I have connected it to the pc.
It is indeed a cheaper ESP from Alie Express. If a faulty regulator, then it is broken and I can throw it away?
Well test with another ESP first - and if the symptom disappears then you know that it was the issue. And test with another PSU - in case that’s the issue.
Don’t throw it away though, you can still power it directly via one of the 3.3V pins and use for some other project.
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I have another ESP running and it works perfectly.
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First disconnect everything (wiring) from your board and try how it goes.
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Don’t throw it away though, you can still power it directly via one of the 3.3V pins and use for some other project.
I am very new to ESPHome. What do you mean by this?
Have already tried 3 power supplies and the wiring is loose. But now nothing!! does not look good, I think! 
More specific? What power supplies? Loose wiring?
2 different computers, 2 different plugs and 2 different USB cables.
Also all wiring is disconnected
An ESP32 usually has a USB connector, this connector supplies 5V to the board.
That 5V is immediately converted down to 3.3V to run the ESP32 - all pins on the ESP chip are 3.3V. If you supply 3.3V to the ESP via one of the pins labelled 3V3, the ESP will run just fine.
You will of course need a 3.3V power supply of some kind and you won’t be able to source 5V from the VIN pins - but I have lots of projects that either run off batteries or other power supplies rather than the USB input.
Ha, also thanks for the great explanation. Now I understand a bit more. 
Good enough. Do you have multimeter (voltage meter)?
yes, i have!
So while powered from USB measure the voltage between 3.3V pin and GND. Observe if voltage is solid or fluctuating.
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It is between 3.22 and 3.27 V
Looks normal.
But doesn’t confirm (neither exclude) bad voltage regulator.
Might be missing / damaged decoupling capacitor.
Did that board ever work ?
Yes, it worked until last night and then suddenly it didn’t anymore!
Can I hard reset this?