SainSmart Network Web Server 16 Channels Relay Ethernet Controller Module, Remote Control Board, LAN WAN Web Server, RJ45 Port, Control Under WiFi Connected Network

This worked just as great as the first one that I shorted out. I will note there is a reset button on there that I didn't know was on there.

This device will pair properly with the SainSmart 16 channel relay.Both devices can be powered by the 12v to the relay.The relays are completely independent. They may have 5v, 12v, 24v, or different sources to each channel.Controlling the device is not as easy as you may/may not think. The web interface did not work well. I experienced consistent lock ups where the device would hang and need to be reset.There are many ways around this. But be prepared to make your own connector and front end. Others have mentioned cURL or downloading 3rd party programs. If you have Windows 10, use Powershell. Invoke-Webrequest will get you started.This device is not for people with no command line or programming experience. But you do not need to be a code ninja to get it working.I would give 5 Stars if the interface and documentation was better (there is none). But it does work as advertised and you should know going into a product like this there is going to be tinkering. Only other pain is I have so far been unable find a way to change the state of multiple relays at once. There is an all on/off but so far I have not found a way to say turn on 1,5,10,15 simultaneously. You can do it quickly, in about a second, but not simultaneously.The device is being used to control 24v exterior lighting and irrigation.

I never had to write a bad review on Amazon but this will be my first. After successfully programming the IP address of this device, I dropped it on my network and had it controlling a relay module in a short amount of time. The real problem with this device is it will not STAY on the network. After a few hours it just disappears! The LED's on the RJ45 jack are blinking but no one is home. I tried multiple high quality 5v regulated power supplies and it did the same thing. Completely disconnecting it from any external relay modules makes no difference. The device does get rather warm for something that really does nothing for most of the day. It also sits in a climate controlled server room so I did not think my environment was a contributing factor to the repeated random failures. I set up a program to PING this device every five minutes to observe when it fails. It will respond for hours or a full day but then disappear into a black hole never to respond again until the power is cycled. Contacting SainSmart support will yield similar results where they say "a development team member is working on a solution", but I can assure you just like the device, your request ends up in the same black hole. Don't waste your time, spend a little more and find a better solution, or better yet build your own from an Arduino. Thank goodness I bought this through Amazon instead of directly through their website. I am sure a direct purchase would have been a nightmare to return!

just what I wanted

These devices are very easy to use and will allow you to change the IP address per device to have many of them on a network, and this goes to the airospace guy who didn't know that...Since its commands are just an address with a port number, it makes these very easy to automate via HTML and scripts...When I find my list of commands I will post them here soon...

No documentation whatsoever. Nothing of much help on the website either, so it was a "suck it and see" kind of day. I couldn't get this to work to start with, plugged into an 8 channel relay board. Only when I discovered that the 5v & ground on the output connector were the wrong way round (?) was I able to get this to work by connecting it back to front. Which meant bending the pins on the relay board over to 45 degrees to enable connection. I guess I could fabricate an extension or use wires but didn't have any to hand.Also the http commands are wrong as stated above; I was however able to map the correct commands to turn on/off all relays individually. The all on/all off worked as stated and I was able to change the IP address from the default. However once that has been done, you can't operate it from the Sainsmart app.After further investigation I realise I have the 16 relay version, there is an 8 channel available (costs more!). Should work fine with 16 channel relay board as pins are opposite on that. However the 8 channel version looks identical to the 16 except it only has a one row connector instead of the double row, so don't know if pins are reversed on that.

I just discovered what I now see several people have written about already for several years: all of these have the same MAC address and it is not registered. So you can't effectively have more than one on the same network. I did get a quick response from their tech support with the answer in the first reply (oh, maybe it's a canned answer since there are probably a lot of people complaining about it!). So, A+ for tech support, F for product design. I needed two for my project, so at least for now, I'm going to try putting them on different LANs with a router in-between. It would be a great product if they played by the rules!

Sehr schlecht! Keine anteitung! Auch im internet keine anleitung! Nie wieder werde ich so was kaufen von sainsmart! Bin entauscht