HiLetgo 12V 8 Channel Relay Module with OPTO-Isolated High and Low Level Trigger 8 Ways Relay Switch Module for Arduino

Works as advertised. I have used several of these for various projects, all worked fine, all are reliable. Everything is labeled clearly on the board. It can be triggered by 12v or 5v, there are little jumpers to change this, again, all clearly labeled. The isolation is a nice feature, though not important in any of the applications I need. The screw terminals hold stranded 18 gauge wire very securely (you can even get two in if you are careful.) I really like the LEDs for each relay that light up when the relay is triggered, makes keeping track of things while setting up complex wiring a lot easier.I can say from experience that these are robust. I accidentally hooked up a few wires incorrectly and shorted 3 of the relays. The plastic on my wires melted before I could unhook from the power supply.... but the board suffered no damage.Some reviewers complained that there are no directions, but honestly, if you don't know what +, -, NC, NO and com are, and if you don't know how to change jumpers, you need a course in basic electronics: directions aren't going to help you. Everything is labeled, the specs are in the description.At less than ten bucks, these things are a bargain.

I put an array of switches on top of the dash of my jeep but did not have enough room to route big cables to power the lights, etc the switches were meant to control. So I just ran a CAT 6 cable, which cannot carry any current speak of, to the switches and then to this relay board. Then of course powered the relay board with real wire and it worked awesome. I mounted the board on a piece of cheap cutting board I bought from Wally world and mounted it under my steering wheel area in my jeep. Honestly it’s kind of a bragging point to show folks the board with integrated relays and the way I wired it. Looks pretty sweet and nerd cool. I’m an automation engineer and this was the cheapest solution I could ever dream of and still works great. I have an in-line blade fuse holder for each incoming power line and quick connectors on the harness for ease of mounting or removing from the vehicle.

I bought this relay so I could make my own Wi-Fi connect sprinkler clock. I wasn't about to pay $400 for one. Instead I got a raspberry pi zero wh ($15.00), power supply for pi ($8.00) and this 8 channel relay ($12.00) for a grand total of $35.00. To put it together load up your pi software then download opensprinklerpi (OSPI). There are directions online that you can follow to set it up to use the GPIO pins to trigger the relay. One thing to note as I didn't realize when I bought this relay is you do actually need a 12 volt input to trigger the relay. The pi was not able to do it on the 5volt pin. I thought it was working when I tested it on my table as it cycled thru the program and turned on the red led for each relay block. However when I connected it to the sprinkler power lines, the relays would not click on. That when I realized that I didn't have enough juice to turn them on. Since this board is a knock off it did not have the separate vvc, vcc-??, Gnd just Dc+, Dc-, 1-8 inputs. So I went and found an old wall wart transformed that had an output of 12volts, this one also happened to be 20 watts which is more than enough but ok to use. The way you have to wire it up is take the Dc+ wire from the power supply and connect to the relay boards Dc+ terminal. Then you connect the power supply Dc- wire to the relay boards Dc- terminal and connect a jumper wire from the relay boards Dc- terminal to a negative GPIO pin on the pi. If you had a jumper from the pi 5 volt GPIO pin to the relay boards Dc+ pin you need to remove it. Hope this helps someone. So far so good with it!!

I love that these have screw terminals instead of pins. I don't have to secure the wires to make sure they don't come off. The boards are as advertised. With other vendors I've gotten boards that claimed you could control if the relays were triggered by a high or low signal, but then arrived without that ability. These have it. I've had no problems and the reliability has been great.

Not sure if just a bad batch but 2/3 purchased boards had dead on arrival relay in position 1.

Well made product... I understand that if your using one of these then your familiar with the wiring.My only suggestion is to have some wiring diagrams for these, other than awesome product.

I used this to control a handicap chair in a van. Works good. Seem to be holding up no problem.

The media could not be loaded. I’ve been wanting a multi relay module like this for some time. This works just as I expected. The input voltage requires 12v but the trigger voltage can work straight off the 5v from an Arduino or similar microcontroller. The circuit board is designed well and is a good quality board.I put together a quick and easy Arduino program to cycle through each of the relays to test everything. It worked like a charm. See my uploaded video. This is a great product at a reasonable price.