ESP32 Forum

Hello,

I am fairly new to the topic of ESP 32. I have worked with these before, and i could connect it and flash it with arduino without any issues.

Since i wanted to add LEDs, I got myself one of the boards without an attached USB adapter and added my own. (https://www.amazon.de/OVNSHVN-Entwicklu ... ter&sr=1-2
https://www.amazon.de/ARCELI-CP2102-Mod ... B07CQTC8P2 )


This is how I connected it:
5v-5v (red)
Gnd-Gnd (green)
RXD - U0T (yellow)
TXD - U0R (orange)
IO0 to GND (brown)




Here is the schematic:



I have installed the most recent driver of the USB adapter.
It shows in the device manager (although there isn't any change to the device manager entry)
However everytime I try to flash something it says: Failed to connect to ESP32: No serial data received.

I have tried two of these boards, ever USB outlet of my PC (with or without intermediate cable).

Is there a way to test whether the ESP32 is actually connected? I mean the USB-Adapter is shown in the device manager. (Just FYI the ready made ESP32+Adapter show in the device manager as USB-Serial CH340)

Thank you in advance!
Kind regards
Felix

If you haven't already, check the TX and RX pins of the adapter. I found that some cheap adapters have their pins "counter-intuitively" labelled, i.e. "TX" at the adapter must be connected to "TX" on the target device...