AITRIP 8 Pack 3V 1 Channel Relay Power Switch Module with Optocoupler Opto Isolation High Level Trigger for IOT ESP8266 Development Board

Good quality build. Mde it easy to turn off a cooler instead of tryingt9 get behind and unplug it.

A nice little device, so far they're all working well

Finally, I have a high power relay that can be driven directly from a 3.3v I/O pin without any need for other supply voltages. I only tried one, but it worked just fine switching 12Vdc loads completely isolated. One reviewer that said these are solid state relays is flat our wrong. These are true hard contact relays that operate at 3v. Very nice find.

Worked great with the ESP32 DEVKITV1 board. If you need help with the code, chatGPT is your friend.

Just putting my prototype together with a ESP32 WROOM-32 DevKit. I wanted to know what the jumpers did and the schematic for this relay module, so I had to reverse engineer it. Hope you find this helpful.

Never used a relay module like this, but it was super easy to incorperate into my project. Just don't power it directly off the board. Wire it similar to how you would a servo. As for noise, I hooked one up in a way as to crate a buzzer and even then, could barely hear it from more than a few feet away

these work as expected. the jumpers don't seem to do what the desc says, but if you just leave them on as they come out of the package the part works as you'd expect & isolates between the HV and LV sides

So far they are working while being driven from a single pin from my ESP8266 development board. The connectors for the load wiring are a bit small for what they are supposedly rated for. More like standard hookup wire size. I have found one so far that had it's board corner broken, no good for mounting, but still works. Worth trying at the price, I have yet to see how many cycles they will run on my project.