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 f...

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 linea...

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 pha...

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 O...

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?