1 Channel DC 3V/3.3V Power Relay Module 3V Relay Switch Module

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.

Used for a project with ESP8266 D1 Mini. Works great with 3.3v trigger

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.

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

It’s a basic optoisolator and relay that works with 3.3V just fine. I don’t remember if it came with docs, but the jumper functions are pretty obvious from the board layout and allow isolating the power and ground of the relay from the screw terminals if you want to truly optoisolate the relay coil. Although it is a 250V rated relay you would be crazy to use this for mains power since it is not properly Hi-Pot isolated, but it’s great for a 12-48V solenoid such as a water valve or a small motor.

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.