SainSmart Web TCP/IP 10A Relay Remote Control Kit with Network Web Server 16 Channels Relay Ethernet Controller Remote Control Board + 16-CH Relay Module, Arduino Compatible, LAN WAN Web Server

Addition: I have purchased 4 more of these, and 2 8 channel ones... Still running good, one thing I wanted to throw out, for those long scripts where you literally turning on and off every relay, there is generally a wait before you able to do it again, its like 30 seconds.... Then secondly, the less switches this is connected to will decrease that. Latency is higher I guess... Also keep in mind the ethernet module runs at 10mbps so depending on network bandwidth it will effect it. I also bought heat sinks on Amazon for the 2 ics on the ethernet module as they do get pretty hot over time... There is one box which got hot because of where it was, so I put a AC fan by it, electronics hate heat, this seems to have made it run smoother, I can actually run multiple scripts one after another without it slowing down or locking up. If I did this before without all of the above, as I said I would have to wait like 30 seconds between scripts. I know this sounds odd, but I want to make sure these things work for a very long time.Ok this thing has been an emotional roller coaster for me. I started with the TCP module. It is VERY easy to setup, set IP and all that, but not for someone that doesn't really mess with networks, or computers. I had purchased 2 for 2 separate applications. I have a bar, and a bowling ally. One is to control all the lights in the bowling ally the other is for the bar. For most of you that have been to a bowling ally you're probably familiar with cosmic bowling. We get busy where the lights don't switch over on time, and also, my employees don't do it suddenly. Because when you switch to black lights, and turn all white light off ALL at the same time, people cheer with joy... Let alone timing and consistency are huge. Same with my bar, they will let the day lights run till 9PM costing more on my electric bill... So initially after wiring it, the web based controller (via your web browser) actually sucks. Its too basic, so basic you can't re-name a relay. I looked into this more, and realized once a website is loaded it will trigger the relay, so I made a bunch of .url file (internet browser shortcut). I ran these in a batch script (pretty basic right). It worked only half the time, the web utility would cease to work, and I would have to power cycle this to get it going again.So... I asked a question on here and got a reply from someone, who wrote a PHP script, so once again, my server is already a php server, he sent me his files, and they didn't work. Oddly I never knew this, but his html document's code was in Spanish, ok, so n/m, don't know enough to try it. So I bought the USB module. This is very easy, plug, use the utility it comes with bingo. Ok so the Windows Utility it comes with just shows number 1-16 ON/OFF. Not what I want for automating my lights, then it came with a DOS command program, right up my ally. Wrote a simple script to turn on and off relays. But for whatever reason, I turn on one relay then turn on another, the relay before it turns right off. I have a script of 10 relays all I here is click, click, click, click...So this isn't going to work at all I was going to learn Arduino, its not too expensive and will get the job done, or just buy a PLC and use that, but thats expensive and I have to learn a programming language. Finally I discovered a utility called cURL. This is a dos based utility which basically gets the website and displays it in text as far as content. I've tried everything at this point so screw it.http://curl.haxx.se/download.htmlI ended up download a 32 bit version for windows, as some work stations are 64 and some are 32, 32 will work on both platforms. Basically wrote a script....C:\curl\curl 192.168.1.4/30000/01C:\curl\curl 192.168.1.4/30000/02C:\curl\curl 192.168.1.4/30000/04C:\curl\curl 192.168.1.4/30000/05Flawless.... the lights change in a blink of an eye! Also it doesn't seem to glitch at this point its day 2 and hasn't messed up on me yet. So now you come in, we have half the lights off, by 5PM we have all the lights on, at 9:50PM the lights turn to that cosmic mode, then at 1:15AM it goes back to day mode, then at 1:31 the lights turn off for the bowling lanes, and seating areas hinting to people we are closed. Same with the bar, 7PM lights goto night mode, lights go back to day mode at 1:15AM.The best part is these go on and off at an instant. The main reason for us doing this is to become a greener facility, as well as making it consistent, and to make sure we can get people out by an expected time. When they lock the building I wrote another script, it will automatically shut down the bar lights, and with a 15 second delay, shut down the bowling lights. The delay is there so they can walk to the front door comfortably.These batch scripts are simply ran on a computer using Windows Task Scheduler. Thats it done deal. The computer in question is a cash register as well, and doesn't display anything to disrupt them from working. As a fail safe, both relay boards are on a digital plug time to cut off at 2:30AM to ensure it resets daily, and to make sure not a single light will remain on if the script fails by night.Additionally, these relays have worked solid for a strait year, even made a halloween show, controlling projectors, lights and ect.... check it out:https://www.youtube.com/watch?v=Y_iVUHSwDBA&t=62sThe only thing was a lot of finagling, as well as the foggers and piano weren't installed in this video. I only used 1 16ch for this project, using our pre-existing lighting control and tricks on youtube to make the lights flicker, as well as OMRON LY2 relays with Schnider contactors, to control fans, foggers high power devices at 12V.Here is an alternative to these relays:https://www.amazon.com/gp/product/B01M16MVE1/ref=oh_aui_search_detailpage?ie=UTF8&psc=1Still playing with it, seems to work fine, has a nice GUI, however does not give the option to write scripts which is what I need. But as of right now these are solid especially if using it for home use.

So far so good. I do want to clear a few things up for more technical people like me who read about this and are left confused. This does default to 192.168.1.4. That isnt great, but you can plug it into a switch and statically configure the IP on your computer to 192.168.1.something and change the IP. So I read some reviews that changing the IP was a problem... I didnt have any. Worked great. Ports... um, well all I can say is the people who made this are really confused on what a port is. This unit uses port 80 (http). What they call a port is actually a URL segment. It is very strange, but the default address to hit is http://192.168.1.4/30000 and they call the 30000 the port. Thats not a port. The web interface works fine... and actually is much faster than I thought it would be. I use mine to toggle the power and reset buttons on servers, and it works great. It uses GET requests, and does a full page load on each click... no JavaScript here. The URLs are interesting, and playing with the UI will reveal everything you need to know.... 30000/01 turns relay 1 on, and 30000/00 turns it off... 30000/03 turns 2 on and 30000/02 turns 2 off. UI links are a little small for a phone, but still can be used.

Great board but like other reviews the web interface is not good and should not be your plan to control this board. Web interface worked at first when i received the board and i was able to change the IP address to have it work with my network. But once i connected to it again after changing the IP address it didn't function properly. I could connect to it but when i would try to turn on a relay with the interface it would remove the dots from the IP address and not function. So i could connect to the board at[...]and when i would hit relay 1 to turn it on it would try to connect to[...]to turn it on.I wrote a control program in C# and board functions properly and without delay.Others have said that you need to give both 12v to the relay board and 5v to the Ethernet controller but i have only 12v going to the relay board and it is all functioning properly*****EDIT*****OK this board is good yes. But only when you need to use one. I bought a few of them thinking i could use all of them at once but you can't. All the Boards come programmed with the EXACT same MAC Address so it is nearly impossible to use multiple boards on the same network at the same time.

Works great but lacks documentation. The default IP is 192.168.1.4, and can be changed by opening the web page at that address. Unlike the iMatic version which requires you to hook up an arduino to the relay controller, you can just hit the web page and enter in your new IP and port that you'd like. I also didn't realize that the relay controller can be powered from the 12v power supplied to the actual relay board, meaning you don't have to supply the 5v to the control chip, which is really nice.I'm building a speaker selector with the relay board to allow control remotely to turn zones on or off.

 Board works great! Powered up the relay board with a 12V DC supply and connected to the units IP no problem. The ethernet control board is supplied 5V DC from the relay board via the multi-pin connector, so there is no need for additional 5V power to the control board. Tested the listed http commands and everything works as it should!With all relays ON the relay board + controller draws about 550mA of current on the 12V DC supply. So make sure your PSU can handle that load.I am toying with the idea of powering the unit with a PoE “splitter” to power the unit as it falls well within standard PoE current draw budget.