Either way is ok.
Whats is happening is when it comes out of reset, its checks GPIO0 state. If high then it boots up normally. If low then it goes into flashing mode.

So, just as long as GPIO0 is low BEFORE reset (EN PIN) returns high your in flashing mode.

I downloaded ESP-IDF Tools Installer v2.2. https://docs.espressif.com/projects/esp-idf/en/latest/get-started/windows-setup.html#esp-idf-tools-installer I got an error code 1 during the install. What is the reason it failed? Setup Log 2020-02-19 #003.txt Just in case people are afraid of a virus, her...

No sweat.... To answer your question is yes you can keep it low during flashing.

By the way, do I have to maintain RESET engaged all along the flashing process, or just at the begining ??

If its held in reset, how could you flash it?

https://github.com/espressif/esptool/wi ... -Selection

hold the relevant boot strapping pins up

Lets be clear, what pins are you talking about.

You can't simply just slap a LiPo batter to the input of any regulator, and expect it to work. There is a thing called dropout voltage for regulators. For example, some regulators need to be fed 1.2v above the voltage you want it to regulate at. You need to look at the data sheet for that regulator ...

I have never needed to write to a file that quickly so I dont know if it can ,or there is something going on with your code.
But the point here is that you can slow down your writes while you are still saving the data to ram.

You throw your samples into a ram variable array. Then you have a back end task that is reading those samples and saving it to SPIFF filesystem. Basically create 2 variable. The one to hold your samples, and one to store how many samples you have. uint8_t samples[21000]; uint16_t sample_counter=0; A...

Here ya go

I think your getting to far ahead of yourself. You need to do more reading than plowing into making a PCB. 1. Connected to 3.3v on ESP-WROOM-32 are 2 capacitors: 0.1uF, 22uF. What are their parts? I also have a AMS1117-3.3 beside the esp that is connected at output to 22uF. Does this make the first ...