Arduino IDE does not see the /dev/ttyS0 port. It cannot see the ESP32 device, there is no way to upl

Question

The Arduino IDE cannot see my device and claims that the only port that is selectable does not exist... In the Arduino IDE the project passes the check (Verify) and compiles, but the Arduino IDE throws errors about a connection problem / does not find such a port as /dev/ttyS0. Only this port is...

khoam · Accepted Answer

This is not a USB port. USB ports should identify themselves as /dev/ttyUSB0, /dev/ttyUSB1 etc. It looks like there is no communication working on the USB port that the board with the ESP32 is connected to.

khoam · Accepted Answer

Maybe the board doesn't have autoreset support? What kind of model is it? The RESET button doesn't work either?

khoam · Accepted Answer

With this USB port, it could be a power problem. Maybe this port has too little current capacity. DevKit draws some of that current.

CC_PL wrote:
But the Arduino IDE doesn't respond to reset

And is the speed in Serial.begin() in the program the same as the one set in the Arduino IDE monitor? If so, this could also be a USB power issue.

CC_PL · Answer

Yes, you are definitely right! In ArduinoIDE, the /dev/ttyUSB0 port shows up and disappears. I don't know why. I managed to upload the soft to the ESP32 3 times and then it disappears, sometimes it appears, disappears,.... /dev/ttyUSB0. What could this be caused by? I have a metre USB cable with filter, a fairly good quality cable (for the phone charger).

khoam · Answer

Would suggest trying with a different USB cable to start with. Maybe even a shorter one.

CC_PL · Answer

I'll make sure to get a shorter cable.

What are the correct next steps after showing up in IDE (after flashing):

Quote:

Leaving....
Hard resetting via RTS pin...

Remove and re-insert USB? I tried resetting, but something doesn't work (in any case, the Arduino IDE doesn't detect that I'm resetting the board). And I would like to receive messages / information from the serial of the board.

CC_PL · Answer

The reset button has, so does the BOOT. But the Arduino IDE does not respond to reset, the board yes resets (after pressing the button). This is DEVKiT- ESP32-2432S035. The problem with the port has returned - the USB port disappears. I'm already trying with the third cable I'm giving shorter and shorter cables, but the port is not visible at the moment. lsusb dumps: .

CC_PL · Answer

Yes I have 115200 in the IDE and in the code. The USB port has moved after being plugged into another USB socket. Hopefully for longer .

CC_PL · Answer

I have changed the cables, the third shortest one seems to be OK. I can burn the program to a disc, but I have no communication with the disc after the serial. I.e. after uploading the software I get the message:

Quote:

Leaving....
Hard resetting via RTS pin...

and that's where the fun ends. The board does not automatically reset, as a result I have no access to the data sent over the serial.

khoam · Answer

I'm guessing you are referring to the board from this thread: https://www.elektroda.pl/rtvforum/topic3966948.html
Do you have a schematic of this board? It was in the documentation you provided links to, but unfortunately I don't think they work anymore.
Otherwise, what soft are you referring to specifically?

CC_PL · Answer

I work with the same one all the time: ESP32-2432S035, this is an extended Dev Kit with touchscreen display based on ESP-WROOM-32.

Soft are examples from the Arduino IDE and my own apps. They work - I have this confirmed via another channel. Specifically, I send information via BLE and receive on the phone. Everything works as expected. So flashing works

On the other hand, I can't talk to the board over serial.

khoam · Answer

This board has little to do with the official DevKit from the manufacturer Espressif, hence my question about the schematic.

CC_PL · Answer

I will attach the schematic soon. However, I also have RESET and BOOT buttons on it. It's just that resetting it doesn't have the desired effect. The Arduino IDE doesn't seem to know about it (?).

I will find the schematic and upload it.

khoam · Answer

Do you have Serial Monitor open in Arduino IDE at this time?

CC_PL · Answer

Thank you for your help and guidance! Another cable replacement helped 🙂 Now everything works as it should.

[Solved] Arduino IDE does not see the /dev/ttyS0 port. It cannot see the ESP32 device, there is no way to upl

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Post #14

Post #15

Post #16

Topic summary