ESP32 Forum

Hi everyone,

I want to upload the code that I wrote in Arduino IDE to my ESP Dev Kit. But I don't want to use USB-mini. Instead, I want to use a USB-to-UART converter because I have developed my own board with ESP32 Microcontroller on it, and that board is tiny, and I don't want to deal with the soldering of the CP2102 component.

So, I bought a USB-to-UART converter that has CP2102 on it. Then I connected the pins like these:

Converter's 3.3V --------> ESP Dev Kit's 3.3V
Converter's GND --------> ESP Dev Kit's GND
Converter's RX --------> ESP Dev Kit's TX
Converter's TX --------> ESP Dev Kit's RX

After I connect them, I can see the port in my IDE, I upload the code, but it is stuck on the Connecting part. I push the boot(upload) button, but it doesn't cause anything. I try to push both buttons at the same time, but it doesn't work as well.

Do you have any suggestions for this situation?

The correct button trick is to press and hold 'BOOT', then press and release 'RST', then release 'BOOT'; as your setup lacks the auto-reset functionality, you'll have to do this every time. However, if you're using a devboard, an additional issue may be that the on-board USB-to-serial converter chips interferes with your external one. Suggest you look up the schematic for your devkit for that issue; at least our official devkits have resistors you can remove to isolate the RX/TX pins from the onboard CP210x.

Thank you for your suggestion. But, I tried that first I removed the CP2102 chip on the Dev Kit and tried to upload my code to the Dev Kit but it didn't work. Also, I tried to upload the code in the way that you described in your first sentence it didn't work also. I will try to desolder the Esp controller chip and I will solder the RX, TX pins of it to the converter and try to upload the code again.

Were you ever able to find a solution to this question? I am having the same issue.

Same problem here

Okay, I found a solution.

I think the USB-UART controller is setting Rx to high. So just remove the resistors from Rx between the Wroom module and the USB-UART controller.