Causes of "Brown out detector was triggered" on ESP32 serial monitor

[NY20200803]

Causes of "Brown out detector was triggered" on ESP32 serial monitor
Of the following 6 points
Which is the main cause?

Healed while improving the following six.

Is there anything else?

About 1-6
What to do if you think wrong?
please tell me.



Question intent
When making a board
I want to use it as a reference for stable operation.

1, noise
Example: IC GND, where multiple wires should be wired, must be disconnected

2. I connected FAN etc. to the output. As a result, the current of the serial power supply became insufficient. It was over 260mA.

3. Because of the hand-assembled experiment, the ESP32 IC was supported by electric wires.
It was supposed to stand up vertically.

4, power supply plus GND wire is too thin, all examples
I have wired with multiple cores.

5. Pull up GPIO35-39, which is not internally pulled up, with a 10K resistor.


6. WIFI connection control series
It will be completed in 500ms
I tried to perform extremely short processing by hand in an environment vulnerable to noise.

[ESP_Sprite]

Most likely power supply. Specifically, you may want to look at your 3.3V LDO (or equivalent), see if it can output the required current.

[NY20200803]

Thank you very much for contacting me.

This is the first additional question.

Is it okay to interpret it as follows?

Interpretation 1
3.3V can be applied,
When 2.8V is detected,
I think that the current is insufficient.

Interpretation 2
3.3V can be applied,
If "Brown out detector was triggered" is written, it malfunctions due to noise.
I think.

that's all.

[ESP_Sprite]

Both things can happen indeed.

[NY20200803]

Thank you for teaching.
Look at what you have been contacted so far
The following question came up.
Please answer.


Question 1
Is the ESP32 operating normally?
To confirm
Should I check the following?

1, Check the power supply voltage 3.3V
2. Run the serial program
Confirm normal operation

"Brown out detector was triggered" is
Confirm that is not displayed

3. Confirm that the program works

I think.

If you can do this
Even if it works for a long time
I think that it may not malfunction.
Is that the idea?

Question 2
In addition to the following, what is necessary for stable operation of the ESP32 in terms of board design?
please tell me
Is that the idea?


1, noise
Example: IC GND, where multiple wires should be wired, must be disconnected

2. I connected FAN etc. to the output. As a result, the current of the serial power supply became insufficient. It was over 260mA.

3. Because of the hand-assembled experiment, the ESP32 IC was supported by electric wires.
It was supposed to stand up vertically.

4, power supply plus GND wire is too thin, all examples
I have wired with multiple cores.

5. Pull up GPIO35-39, which is not internally pulled up, with a 10K resistor.


6. WIFI connection control series
It will be completed in 500ms
I tried to perform extremely short processing by hand in an environment vulnerable to no


=====


Question 3
Temporarily your company's ESP32
Even if there is a solid ground on the board at the bottom of the upper antenna
no problems?

Or is it okay to have a printed circuit board?
Example: Place the ESP32 in the middle of the board,
The act of designing a new board

About question 1-3
If you can understand
Contact Please.

[PeterR]

Lots of questions.
Sprite answers all in his line:

Most likely power supply.

Put a scope on your LDO (or whatever PSU's) output. Set trigger to 3.2V (or whatever the ESP likes). Debug.
ATM you need to know what is wrong, not what might be wrong. Measure.

PS No one can help you without a schematic & parts list - you could be powered by a 100mA PSU for all I know.
I hope that this is not a home work question!

[NY20200803]

In other words, I would like to know the following.

Current
While observing the above items
As shown in the attached figure, it has been in operation for more than 10 days, but it is operating normally.

Is there any problem with the drawing of the following url for stable operation for a long period of time?

URL

https://www.dropbox.com/preview/esp32_20201005.pdf