ESP32-WROOM-32U - soldered - but not flashing

obod0002
Posts: 4
Joined: Sat Apr 13, 2019 2:34 pm

ESP32-WROOM-32U - soldered - but not flashing

Postby obod0002 » Sat Apr 13, 2019 3:00 pm

Dear all,
I'v been using some of the different types of the ESP family - but the last one seems to not like me:

As I need low current, a deep sleep longer than 71minutes as well as an external antenna to increase range, I decided to buy two of the ESP32-WROOM-32U chips as well as the ESP-32S breakout boards.

I soldered both, checked to not soldered two side-by-side pins together and checked RESET button connects EN to GND as well as IO0 button connects GPIO0 to GND.

I'm using Arduino IDE and trying to upload a sketch that I was using together with a NodeMCU-32 development board.

I'm using a UART flasher that works fine with ESP-01, ESP-12 and even the development board of NodeMCU-32 (when not using that nice USB connection).

I'm connecting
ESP-32.....UART.......LiFePO4 (charged)
GND.........GND........GND
VCC..........................VCC
TX............RX
RX............TX
All other pins remain unconnected.

When the IDE is ready for upload, I'm holding down IO0 plus clicking RESET.
But it won't work, I'm always receiving the same error:
A fatal error occurred: Failed to connect to ESP32: Timed out waiting for packet header

Sure, my soldering skills on such tiny devices might be the reason, but I hope it's rather a difference between the various chips I missed out.

Thanks for helping
Olaf

obod0002
Posts: 4
Joined: Sat Apr 13, 2019 2:34 pm

Re: ESP32-WROOM-32U - soldered - but not flashing

Postby obod0002 » Fri Apr 19, 2019 3:16 pm

I found my mistake as I have to additionally connect
IO0 -> GND as well as
EN -> 3V3

Both soldered ESP32's accepted to be flashed. But currently only one is still working.
Maybe I put the other in a state where it's waiting for something different ...?

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