I purchased one of these 8-channel relays a few years back for an irrigation controller project and it has worked flawlessly. I’m now building another for a family member so I wanted to stick with what works.My project uses a raspberry pi zero wh and uses this SSR to control 24v to power each irrigation zone.

When controlling true analog devices such as incandescent Christmas lights, it works fine. However, if controlling something more digital such as LED lights, there is a nominal voltage leak when the relays are supposed to be open. The LEDs pick this up and they are dim, not off. You can use an ohm meter and get continuity between the leads when the relays are supposed to be open. Had to return two sets. I assume this is by design, but be aware.

Worked perfectly

I thought it was broken at first because it didn't open the relays when running my test program. But as soon as I added my 110v, it worked. Probably should have some documentation on that included

just the one I wanted. so far works great.

Works great. I used this product combined with a raspberry Pi to control my Xmas lights. No problems at all.

Great solid state opto isolated relay module. I use it in a research instrument to actuate solenoid valves for irrigation. The solid state relays are quick and have stood up to months of use in a hot, humid, and intensely lit greenhouse environment. The price was appropriate, this product is a good value and high quality. I recommend this product for applications where the relays will be switching many times and at a high frequency, these modules are clearly superior to mechanically actuated relays for most applications.The LEDs are great for indicating the status of each relay. This is the second great product I've got from SainSmart, the first being a Arduino Mega 2560, and I will definitely seek out their products in the future.

I was trying to make a circuit like this myself. The cost of fewer than 8 relays alone were over $30 (mouser.com). This was a great value and works well. The LEDs that illuminate to indicate active channels are helpful in testing.I didn't realize at first that with solid-state relays, you cannot test their state (open/closed circuit) by checking continuity. I was doing this and thought all the channels were non-functional. After I connected an actual load though, they worked beautifully. I can ever get them to switch as fast as 200ms!

I've purchased several Arduino-compatible devices from SainStore. All have been packaged well and assembled with reliable components. This is worth 5 stars.There are no heat-sinks on the relays, which is ok for proof-of-concept on a lab bench with limited duty cycle. If you need all 8 of them to switch light loads infrequently, you'll probably be ok. If you need all 8 of them to switch resistive loads, they'll need a heat-sink to keep from heat-soaking each other. This is worth 3 stars, but a great opportunity for Sain to offer an add-on heat-sink that slips over the SSR's so they could run closer to 100% duty-cycle at 70% rated load. In my prototype system, two of the channels on this board are laddered to much larger SSR's with big heat-sinks (switching heavy resistive loads), and other channels are doing things like phase-angle chopping for light inductive loads. There are LOTS of ways to use this little thing.I needed a bank of solid-state relays for an automation project, with limited space in the control box. This SSR board is very compact for what it can do, and seems to work well. This is worth 5 stars.Finding which segment of a prototype system isn't performing can be tedious, but with LED's showing channel state, this assembly is one less place I have to hook up test leads to see if it's receiving the input and applying the output. This is worth at least 4 stars.Overall, a very handy piece at a very reasonable price. Sain, if you're reading this, I'd love to see a couple heat-sink options for this (two different fin orientations on top to work with airflow management in an enclosure).

As an electronics hobbyist, I am planning to design my own Christmas light show this year and dreaded the idea of having to build boards with relays on them that could be controlled by my Arduino. This board has all the features I could possibly want, and it's designed better than what I would have done at a fraction of what it would have cost me to do.NOTE: This uses a triac; so it's not going to work for switching on direct current loads. I verified that with a quick test. It works great for AC loads, but is not designed for DC loads. If you need to control DC loads, then you'll want to purchase the mechanical relay board also made by Sainsmart.A schematic of how each relay is wired is given at the Sainsmart website. Based on that and some measurements I've made, here are some features that aren't obvious from the description.1. Each relay is protected by a fuse. Granted, the fuse is hard-soldered to the board; so if you blow the fuse, you'll have to de-solder and re-solder a new fuse in place, but that's not a huge problem. Protects each circuit from drawing more than the 2 amps that the relay is rated for.2. The signal from the Arduino doesn't cut on the relay directly. Instead, the signal from the Arduino turns on a transistor, which closes a circuit that turns on the relay. The relay itself is optocoupled; so there is plenty of electrical isolation between the Arduino board and the relay. No worries at all on my part about frying my Arduino board.3. Each relay draws about 10 milliamps from the Arduino when switched on. If you're only turning on a few relays at the time, that is not a problem for the Arduino to handle. If you want to turn on LOTS of relays at the same time, the transistor design mentioned above allows you to provide an EXTERNAL dc voltage to turn on the relays and then the Arduino can be used to just switch on the transistors. It's a very elegant design that is ideal.4. Each relay has an LED wired to the circuit so that when the LED lights up when the relay is switched on. This takes the guesswork out of wiring issues and wondering if you hooked things up properly.I plan to eventually use 6 or more of these relay boards to be controlled by an Arduino Mega. Each relay will be used to provide power to an electrical outlet into which I can plug the Christmas lights. The time that I would have spent having to design a relay board just got eliminated so that I can spend more time on my light show design.Overall, this is an excellent design. If I run into any problems, I'll post again, but it looks like it's going to do everything I could possibly want.UPDATE: This board is fantastic! I've been using my Arduino to control AC loads with it. Works like a champ. Excellent buy for the money, since many board on the internet with this capability cost much more. If you want a solid, well built board that works, then this is the one for you.

Alright, I ordered this with some skepticism because the boards commonly recommended by Christmas sequencers out there (like Vixen freeware) are all quite expensive and do-it-yourself intense. When I saw this board for the price, I ordered one to test out with my Arduino Mega board and it took all of 10 minutes to get it hooked up and working like a champ.I have not put it into use with 110VAC yet. (J Fuller, I would LOVE to see how you wired this up)From the LED status it's working PERFECTLY with an Arduino board and Vixen. It took 5V and a ground (provided by the Arduino in the "POWER" section on the Mega 2560 board), and I have no ground in the "GND" connection on the main 9-pin screw-down connector.In short - this board, combined with Arduino and Vixen greatly simplifies these "amazing displays" that you see all over YouTube.-S