No serial data received

Using Arduino Microcontrollers
1

Hi there,

I bought an uPesy ESP32 board last week (here Carte uPesy ESP32 Wroom Low Power DevKit), trying to build a project for the first time.
I started a new code with arduinoIDE, and I've quickly been abled to connect and use wifi, show current hour, then display this on my SSD1306 screen and finally connected a battery to make it autonomous. I was having a lot of fun :slight_smile:

Yesterday, i added code to make it go deepsleep after 30s of display, and everything was still fine.

But since I tried to connect a button so that i am able to wake it up, i never been able to upload my code update, facing a connection problem :

"A fatal error occurred: Failed to connect to ESP32: No serial data received."

  • I tried using the BOOT button and or the EN button
  • the COM port appears/disappear correctly when plugging / un plugging device
  • i disconnected everything from my board
  • i uninstalled / reinstalled the driver
  • i changed my usb cable
  • i tried erasing the flash with esptool directly
  • pushing the EN button raise correctly (?) a message on the monitor :

13:53:12.631 -> ets Jul 29 2019 12:21:46
13:53:12.631 ->
13:53:12.631 -> rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
13:53:12.631 -> configsip: 0, SPIWP:0xee
13:53:12.631 -> clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
13:53:12.631 -> mode:DIO, clock div:1
13:53:12.631 -> load:0x3fff0030,len:1344
13:53:12.631 -> load:0x40078000,len:13964
13:53:12.631 -> load:0x40080400,len:3600
13:53:12.631 -> entry 0x400805f0

But i still have the same problem :

esptool.py v4.5.1
Serial port COM3
Connecting.....................................Une erreur est survenue lors du transfert du croquis
.

A fatal error occurred: Failed to connect to ESP32: No serial data received.
For troubleshooting steps visit: https://docs.espressif.com/projects/esptool/en/latest/troubleshooting.html

I saw several similar posts, but no solution that unlock me until now...
Could you please help ?

Thanks a lot !!

2

Are you using a Nano ESP32 ?

3

Your board does not seem to be a Nano ESP32. hence topic moved to a more suitable location on the forum.

I don't have experience with your board so can't help further.

4

what Tools>Board have you selected?
I tend to use ESP32 Dev Module with the majority of ESP32 dev kits

5

I use the "uPesy ESP32 Wroom devkit", the one recommended by the constructor.
It has been working fine for one week...

6

could be the ESP32 device is damaged
do you have any other microcontrollers you could try?

7

No i do not have another one.
Is there any other way to know if it is damaged ?

Thanks

8

off hand cannot think of one - you tried all the obvious fixes such as changing USB cable etc in post 1
I tend to buy several ESP32 NodeMCU devices on EBAY at a time - cost between £6 and £7 - if buying check you have suitable USB cables - newer boards uses USB type C

9

I finally found a solution !
I tried and found the good EN / BOOT button combination ; pressing BOOT AND EN right after the connection begins and release ONLY EN few seconds after and finally release BOOT few other seconds after.
I tried before a lot of combination and was sure to have already tried this one but this morning it worked.
Thanks a lot for all of you that took time to read and answer my post !

10

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.