ESP32 on development board would not accept Flashing when sent on TX Rx pins in spite of Grounding IO0

[rajendrapk@yahoo.com]

Hi all.

I want to Flash my ESP32 via a serial chipset connected to my USB.

I am able to see on-boot messages in Serial Monitor of Arduino IDE, however, while flashing, it would attempt ___...___.... but never succeed.

I first attempted usual way of pressing the push button on the development board, did not succeed.

Also attempted touching a jumper wire from IO0 pin of ESP32 Module directly to the Ground.

No change in observations.

Please help!!

Rajendra.

[username]

If you want to automatically flash you will need 2 more connections. EN & GPIO0. Your USB to serial board does not support it. There is a sequence with these 2 pins to put it into flashing mode.

You can manually put it into flashing mode, but you will have to press and hold down the boot button, then press and release the EN button, then release the boot button.

[ESP_Sprite]

I think that it's more likely that the issue is that your devboard already has an USB-to-serial-converter connected to the Tx and Rx pins, and that connection is interfering. Suggest you use the onboard USB port to program the board instead.

[username]

I think that it's more likely that the issue is that your devboard already has an USB-to-serial-converter connected to the Tx and Rx pins, and that connection is interfering. Suggest you use the onboard USB port to program the board instead.

Dam, something so obvious... Good call ESP_Sprite!

[rajendrapk@yahoo.com]

Hi, everyone, this came out to be Earthing issue!
It worked exactly as it is, when laptop was connected to other electrical board.
Actually I was sensing low-voltage tingling while putting in and putting out the Serial Chipset, somehow it didn't strike me!
Sorry for trouble guys!!

ESP_Sprite thank you for your tip, but it worked without any conflict.
The same TX0 RX0 pins can be used for external peripheral device's serial communication.
So the onboard serial chipset would not come into picture.

Thanks,
Rajendra.