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rubenB , 09-17-2024, 06:24 AM

I finished Robert's tutorial on DIY ESP32 using Altium. I soldered and tested the board. I used Arduino IDE example for Blinking LED and both USB port works. However, only one USB port works when I use the simple WiFi LED example in Arduino IDE.

In this picture, this USB port would not work with the simple WiFi example. It uploads but it does not output anything in Serial Monitor. Help pls!!

Robert Feranec , 09-17-2024, 02:33 PM

did you try reset?

Robert Feranec , 09-17-2024, 02:33 PM

btw, well done 🙂

Robert Feranec , 09-17-2024, 02:34 PM

also, on what serial are you sending the output? If on the standard serial port, you may need to connect the second cable (?) .. I am only guessing, didn't try it

rubenB , 09-17-2024, 04:51 PM

I tried reset but it still didn't work. I connected it to the standard serial port labeled (ESP) which is usb2. I will try connecting the second cable and see if that works. For the jumper, do i keep it on the standard port or should i place it in the UART port if i connect the second cable?

Robert Feranec , 09-17-2024, 06:20 PM

I mean in your code, were do you send the serial output?

Robert Feranec , 09-17-2024, 06:22 PM

I don't have the board here, but by default the serial output may go to the other USB, so you may need to connect it and then use a serial terminal to see what is sent there (?) maybe ?

Arij feki , 09-18-2024, 12:03 AM

when you upload the code click you must hold down the 'Boot' button and press the 'Reset' button once.

rubenB , 09-18-2024, 04:00 AM

I tried connecting both ports at the same time, but it keeps connecting and disconnecting. Not sure if I am shorting somewhere.. but the board starts freaking out when both USB ports are connected

EDIT: It is a mistake on my end.. I have two Arduino IDE opened and trying to connect to the same port hehe. Everything works well 👍

rubenB , 09-19-2024, 01:39 AM

@Robert Feranec sorry to open up the thread again, i finished another board and same thing happens on my end where if both usb ports are connected, no matter whcih pin the jumper is connected, the esp usb port keeps connecting and disconnecting, while the UART usb port remains stable and connected.

rubenB , 09-19-2024, 01:45 AM

I also noticed this connecting/disconnecting stops when I run the simpleWifiServer example in ArduinoIDE while both ports are plugged in

Robert Feranec , 09-19-2024, 03:48 AM

do you have both cables connected to the same usb hub? also how do you power up your board? This behavior is often caused by ground loops.

rubenB , 09-19-2024, 04:55 AM

Yes both ports are connected directly to my laptop. I am powering it using the usb ports as well, it does it regardless of which usb port powering the board

QDrives , 09-19-2024, 11:46 AM

Does it reset due to watchdog or power problems?

Robert Feranec , 09-19-2024, 02:45 PM

are the cables the same length and are they short? Are they connected to the USB ports close to each other? That is what I would try first. Possibly if you disconnect laptop from charger and run it from battery, is there a difference?

rubenB , 09-19-2024, 02:48 PM

Not sure how to answer this but i probed the 3.3v pin of the regulator and it has a stable voltage

rubenB , 09-19-2024, 02:50 PM

I ran it from battery and plugged in as well, no difference. I am using two different lengths and one is USB C to USB C and the other cable is USB A to USB C

Robert Feranec , 09-19-2024, 02:51 PM

if ground on one cable is different to the ground on the other cable then the voltages on USB can get some noise and that could cause problems

Robert Feranec , 09-19-2024, 02:52 PM

that is why I suggested ports close to each other, short cable and test it, just to see if it helps .. if that is the problem. If you have one port on one side of laptop, the other port on other side of the laptop and different cable lengths that could also be maybe problem

rubenB , 09-19-2024, 02:53 PM

I will try that and let you know if it fixes the issue, thanks!

Robert Feranec , 09-19-2024, 03:29 PM

use exactly the same cables, as short as possible and plug them into the ports near to each other

Robert Feranec , 09-19-2024, 03:45 PM

USB on the FTDI chip may be more robust comparing to the USB on ESP ... but that is only my guess, that may be why you see the problem on the ESP one (I could not find much information about USB characteristics on ESP32). I have not played much with the USB on ESP, but I have seen a lot of problems with boards which are connecting grounds through multiple cables.