Youngneer 5v Relay Board Relay Module 1 Channel Opto-Isolated for ARM PIC AVR MCU（6Pack)

this relay is all you need for an arduino project. btw it's not necessary to plug the + and s pins in seperately, you can just tie them together to a single output on an arduino. great for turning things on and off. i just used one to make a timed billiard ball polisher, and another to turn a tv on when my computer is turned on.

I bought a batch of a similar board from ebay. The led's would light, but no clicking. I have no idea why they didn't work, maybe it was expecting 5vAC?Anyway, these are straight forward. ground to ground, positive 5vdc to the other 2 pins.. CLICK! Perfect for enabling an AC device (especially DC plugs). Couldn't be happier with these!

The item is as described. I am using these relays as controls in Halloween props. In this instance I am using them as an interface between a EFX Prop2 controller and a MDFLY audio board. I see many uses in the future with sensors and prop controllers.It would have been nice if a wiring diagram was available, I couldn't find one. It wasn't too hard to figure out. I am sure that I will be buying more in the future.

The 5V relays are nice and compact. I made a mistake, realized I dont have an easy 5V source to drive them. They drive fine at 3.3v, turn on with hi on select.

All of the relays I purchased worked amazingly except for one. I contacted support and got a replacement within 2 days. Very good customer support and the products work very well. Perfect for any Arduino projects.

all are working fine.

There built with a high quality circuit board. Frankly I don't know how they sell these at this price.

Works well in an automated Christmas tree project with the Attiny85.