ESP32 WiFi goes OFF when output pin is continuously toggled

[chuxyz]

I'm having challenge with my ESP32 Dev board. Whenever I connect to wifi and try to trigger the output pin, everything seems to work fine except that the WiFi goes OFF at some point and does not come ON until I switch OFF and then ON the power supply. Anyone know what the problem is?

[ESP_Sprite]

Can you share code? What do you mean with 'wifi goes OFF', can you share serial logs when that happens?

[chuxyz]

I don't think the problem is with my code because everything works fine when plug ESP board to my PC. The problem only happens when I connect ESP board to my circuit to switch load. What I mean by WiFi goes OFF is that the WiFi network disappears completely and only reappears when I switch OFF and ON power supply.

[ESP_Sprite]

to switch load.

Ah, you didn't mention that before. What circuit are you using, can you post a schematic, or at least tell us what components are involved?

[felmue]

Hello @chuxyz

you might need something like a snubber (https://en.wikipedia.org/wiki/Snubber) to reduce EMI. I had a similar issue where I could switch a relay by itself just fine, but some weird stuff started to happen when I attached a light bulb to the relay. Adding a snubber fixed the issue for me.

Thanks
Felix

[chuxyz]

to switch load.

Ah, you didn't mention that before. What circuit are you using, can you post a schematic, or at least tell us what components are involved?

My circuit is a very simple one. Output pin of ESP circuit triggers a 5Vdc relay which in turn triggers a 220Vac relay that powers a single phase electric motor. I used a linear power supply to power ESP board

[chuxyz]

to switch load.

Ah, you didn't mention that before. What circuit are you using, can you post a schematic, or at least tell us what components are involved?

Output pin of ESP circuit triggers a 5Vdc relay which in turn triggers a 220Vac relay that powers a single phase electric motor. I used a linear power supply to power ESP board.

[chuxyz]

Hello @chuxyz

you might need something like a snubber (https://en.wikipedia.org/wiki/Snubber) to reduce EMI. I had a similar issue where I could switch a relay by itself just fine, but some weird stuff started to happen when I attached a light bulb to the relay. Adding a snubber fixed the issue for me.

Thanks
Felix

Thank you Felix.

Should the snubber be in parallel with relay contact or with the load?

[felmue]

Hello @chuxyz

In my case I used an RC snubber with is in parallel to the relay contact.

Please be careful when doing experiments with mains voltages.

Thanks
Felix