AEDIKO 10pcs Relay Module DC 12V Relay Board 1 Channel with Optocoupler Isolation Support High or Low Level Trigger

These relays work well with both high and low level inputs.One thing that lets them down is the quality of the screw terminal blocks - I have seen better.

The terminal blocks have a weird flap on and is can be really difficult to get even a thin wire in. Not sure why they couldn't just make them normal plain screws.That said, they work fine and have choice of NC/NO like every other relay in the world. I was activating these 5v relays using 5v from an arduino or using 3xAAA batteries. No problems either way. Bought from amazon as I needed them the next day and couldn't wait 38 days to get them delivered from you know who.

I used this relay to drive a pond pump (240v) via a float switch (reed) driven by a 12 v supply… to control water level in a pondWorks well

These modules while great in some respects, they are cheap and so as expected the first module I used failed within minutes. But at this price I am not too worried so long as the bulk of the 4 work for a relatively long time

Bought the board to add to an arduino nano GRBL board for my CNC plasma machine… it works what more could you ask for..

Do exactly when they should.

Using these to switch ceiling lights on and off, work perfectly- thanks

I guess you get what you pay for but only 3 of my relay modules functioned. The fourth relay refuses to activate and just gets hot.