UART comunication with ESP32-3248S035

Other Hardware 3rd Party Boards
1

Hello everyone, I am having a problem with UART communication between 2 esp32.
On one side I have an esp32 DevKit V2 from AZdelivery and on the other, an ESP32-3248S035. Both are connected to their UART 0 port
Wiring :
TX -> RX
RX <- TX
GND - GND
My code is the same for the 2 boards but only the esp32 devkit receives the data.
So I tried different tests and the problem seems to come from a "voltage scale" problem.
Here is the shematic of the ESP32-3248S035 part :

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When I apply TX from DevKit after the resistor the ESP32-3248S035 receives the information.

I wonder if it is possible to adjust the output voltage of the TX of the devKit so that the ESP32-3248S035 detects its input or if I have to change the circuit of the ESP32-3248S035 in order to put a wire rather than a résistor.

If anyone can help me with this situation.I can provide you with other information on the schematics, the code used or any other useful information.

PS: Sorry if I got the section wrong, I put Hardware because I think my problem is hardware but if it needs to be modified, don't hesitate to tell me.

2

did you measure the operating voltage (3.3V) of devkit? and 3248S035?

3

3.27V for devkit and 3.33 for 3248S035

4

Bad wire on tx or common ground?

5

No, I checked to connect TX with RX for the 2 board and the common ground, it works one way but not the other.

6

Are you using Serial0

7

Yes it is the only one available on the 3248S035.

8

And using also USB serial?

9

Yes

10

You are sharing the uart0. Could you move Usb serial logging to devkit and free that other board from usb-serial?
Edit: With expectation your devkit has uart1 o uart2 still free

11

I mean are you using Serial0.read() and NOT Serial.read()

12

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