ESP32-EVB becomes unresponsive, when switching loads

LubOlimex · May 07, 2025, 08:56:54 AM

As long as I see this time it is relay 2. So the theory that it is an issue related to relay 1 only is now debunked.

I also forgot to clarify that when you run my demo the board will get IP address that is visible at start of initialization and then you can disconnect USB and ping the IP address it got so you can check if the Ethernet is working over the network without the USB being connected.

I am testing again today, will keep you updated. We will test with different capacitor for C18 and see if that improves the behavior. We will test with different relays. Meanwhile if possible test these two scenarios:

- Test with incandescent bulb, while halogen bulbs should have lower EMI/RF I still see garage door companies clearly recommend avoiding them so maybe they know something that we don't know (like here https://www.admgaragedoors.com/What-Light-bulbs-can-I-use-in-my-garage-door-opener)

- Enlengthen the bulb cables and place the bulb 1 meter away from the board and the rest of the cables. Then test with both bulbs - LED and halogen. See if hang still occur. I believe proximity plays huge role here.

Biblbub · May 07, 2025, 07:51:55 PM

I have attached an extension cord to the relay and then connected a hairdryer instead of a lightbulb to it.
The dryer is far enough away from the board to be in another room, (approx. 2m), so I think I covered the interference angle: I see the same behaviour.
It works a few times and the disconnects:

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LubOlimex · May 08, 2025, 10:20:23 AM

It is probably a hardware problem with this specific board, please contact us over support@olimex.com to arrange warranty replacement. Provide a link to this thread in the e-mail to address the issue faster. Sorry for this.

ESP32-EVB becomes unresponsive, when switching loads

LubOlimex

Biblbub

LubOlimex