5Pcs 1 Channel DC 3V/3.3V Power Relay Module 3V Relay Switch Module with Optocoupler Relay Module Isolated Drive Control Board 10A 250VAC 10A 30VDC Control Development Board

I used a esp32c6 in a fan project and used these the close the green wire of an atx power Supply while the ESP 32 ran off always on purple the C6 triggers the relay which kicks on the power supply that feeds 12 volts to a DC brushless controller and the ESP 32 sends a pwm to it also to control the speed of a Milwaukee brushless drill motor I jammed in it. You can hear it click when it turns on and off which is nice if you want to know if it's working. I only used it on extremely low voltage but I'm confident it would work for high voltage appliances also but 3.3 volts from a microcontroller will trigger it to open and close I didn't get any pictures of the relay itself but here's the completed project

Good value without having to buy more than I need. Worked great for a Raspberry pi project that was controlling 12VDC devices. Quality and workmanship of the board was also very good

If you don't need documentation, these relay modules are very nice. After a little experimentation, I was able to drive this from a Raspberry Pi Zero W.

Wish Id bought the 10 pack. Worked as described, triggered by a raspberry pi pico gpio and a separate 3.5v power supply for the relay module Vcc.

Here's the KiCad schematic I made. It's a nice little board, works great driven from my 8266 ESP-12E dev board output pin, and using the 3.3v output pin for the VCC input. The vendor really should have supplied a schematic for folks!

I added these to ESP32 boards and they work find. The soldering make a good impression as well.

I used these connected to an ESP32 dev board running ESPHome to control various buttons in my house through home assistant. For one, I wired the garage door opener button through the relay and I can remotely press the garage door opener button now. For another one, I wired my old analog door bell chime through the relay and I can trigger the doorbell chime through an automation when someone presses the doorbell button on my smart doorbell. What can I say, 3.3v relay is useful when you have 3.3v microcontrollers.

1/5 dead relays is already a problem as it is. Then, turns out the LED on the board is taking 1.7V of power from powering the coil on the other relays so a Raspberry Pi 3.3V GPIO pin can't power the coil to click the relay. The LED is in series with the power side of the relay coil so you literally have to short the LED to get enough power to the coil. This affects ALL the relays in this product. All these guys did was take a 5V relay module and stick a 3V relay on it. That doesn't work. Buy something else.

Work great. I'm using these to control my door bell solenoids with an ESP32-C6 and Zigbee. Its nice they drive from 3.3 volts and the seem to all work as advertised with no issues. I've got 10 of them for future projects.