ESP32 Forum

Hi. Is it possible to program an ESP32 using another ESP32? I have an ESP32 where the serial chip burned out when using 6 volts directly over the 5 volt pin .

I hope you can help me.

You can use USB to UART thing, like this:
https://www.amazon.com/usb-uart/s?k=usb+to+uart
https://www.amazon.com/USB-UART-Convert ... B01M33YNAP

It should be possible if you hold the other esp32 in reset

chegewara wrote: ↑

Thu Sep 09, 2021 9:40 pm

You can use USB to UART thing, like this:
https://www.amazon.com/usb-uart/s?k=usb+to+uart
https://www.amazon.com/USB-UART-Convert ... B01M33YNAP

Thanks. I still don't have a USB to serial converter. Is it possible to use an Arduino NANO as a converter? If so, what would it be like?

Like @WiFi said, you can use another esp32 board. UART chip on that board will pass data to fried board.
You have to connect (its not mistake, it is parallel connection):
- TX -> TX
- RX -> RX
- EN -> EX (optional)
- PIN0 -> PIN0 (optional)

More steps:
- when you dont connect EN and PIN) manually switch into bootload mode with buttons on fried board,
- keep pressed reset button on good board; it is important to not let esp32 on this board to start,
- flash.

That should do the trick.

I know this is an old thread, but for anyone googling in 2023+
https://github.com/espressif/esp-serial-flasher

Is there a way to do it over wifi or ble?

thezcx wrote: ↑

Sat Aug 05, 2023 7:44 pm

Is there a way to do it over wifi or ble?

Yes. Use OTA (Over-the-air).
Over WiFi: https://randomnerdtutorials.com/esp32-o ... ogramming/
By Bluettoth: https://github.com/fbiego/ESP32_BLE_OTA_Arduino

LittleRain wrote: ↑

Sat Aug 05, 2023 1:35 am

I know this is an old thread, but for anyone googling in 2023+
https://github.com/espressif/esp-serial-flasher

Thanks for the link

user_MicSG wrote: ↑

Mon Aug 07, 2023 1:27 am

thezcx wrote: ↑

Sat Aug 05, 2023 7:44 pm

Is there a way to do it over wifi or ble?

Yes. Use OTA (Over-the-air).
Over WiFi: https://randomnerdtutorials.com/esp32-o ... ogramming/
By Bluettoth: https://github.com/fbiego/ESP32_BLE_OTA_Arduino

For deep sleep applications i cant use OTA. İm looking for a solution where i use the eps32 as ftdi board wirelessly