ESP32-Wroom-32 MODULE (*not* Development Board) does not communicate with Arduino IDE

[rajendrapk@yahoo.com]

Hi, all.

Which "Board" do you select in Arduino?
My new "bare modules" (ESP32-Wroom-32) just do not communicate with Arduino IDE.

I do NOT see any Arduino Board like "ESP32 Wroom32 Dev Module", like I see for other variants like Wroover32, Pico kit, etc.

I already tried with board "ESP32 Dev Module".
It does NOT work.
Also attempted other common variants such as Lolin, WeMos, etc. but No Luck!

Please help.

Rajendra.

[ankayca]

Maybe you can try to update firmware of esp32.
Some times we use AT codes for program it and I update it . After that arduino can not program esp32. You should do it on the contrary

[lbernstone]

"ESP Dev Module" should work to upload to pretty much any device. Perhaps if you explain what "just not communicate" means, then someone could help you more.
On a bare module, you must hold gpio0 low while resetting the device. This will put it into programming mode. You should then see "waiting for download" in the serial monitor. If you see nothing in the serial monitor, then you have a problem with your driver or cabling.

[rajendrapk@yahoo.com]

Okay, ... it was related to EN not being Pulled High!!

I believed, EN is Pulled High internally and Automatically.
No, it is not, at least on ESP32-Wroom32, at least when purchased in September 2020.

WE NEED TO Pull it High.
I placed an available 6.7K resistor between EN and 3V3 and everything started AS EXPECTED!
Sorry for trouble, friends!

Rajendra.

[ESP_Sprite]

Note that you also need a capacitor, to reset the ESP32 on power-up. See the datasheet which advises an 10K/100nF RC combo (it's TBD in the schematics, but there's recommended values in the text)

[rajendrapk@yahoo.com]

Oh, thanks for pointing out, ESP_Sprite!

Rajendra.