2PCS 5V 4 Channel Relay with Optocoupler High/Low Level Trigger

Nice relay board. Lo and Hi voltage systems are completely isolated. All 4 relays Hi voltage side are completely isolated from each other, which makes it very nice if you have system with multiple power systems. In my case I have 120VAC, 24VDC and 5VDC powers, so this works out real nice. Has jumpers to FLIP the inputs (Active lo or Active Hi) and all relays are 3-way and have both NO and NC function, so that adds extra flexibility. Built-in Back-EMF suppression circuit to protect your micro. Overall, very well made.

Great 4 channel relay module for Arduino & Raspberry Pi. Includes a 5V in and ground screw terminal pair (marked as DC+ and DC-, respectively), along with four inputs for each channel. The relays all have optocouplers, transistors, flyback diodes, and LED indicators, so you don’t need to worry about adding those yourself. The opposite side of the board has Normally Closed, Common, and Normally Open connectors (marked as NC, COM, and NO respectively) for each relay.

Works as expected so far. One had some superficial damage to the jumpers, the other had a large gob of solder connecting the rightmost diode to the ground plane, so much so that it looked like someone sculpted the letter "Y" with it. I hit it with a bit of solder wick and it seems to function fine. Not a problem for me, but it would have possibly disabled the 4th relay for someone that didn't have the right tools to fix it.

Reliably switching 24v sprinkler solenoid valves for over a year. Good price! Got a backup... It's in an outdoor enclosure so I don't care about the noise (yes, it's a mechanical relay) or the LED (nice visual feedback). Easy to integrate with an Arduino and I think it'll do just fine. The system doesn’t stay out in the winter but it's there during the 100°+ heat. I have not experienced any negative issues with the Arduino and I assume it's optically isolated to the controller/signal.

Nicely made with neat soldering. Good stuff.

one ⭐ review: wrote a basic HIGH LOW program to cycle through relays all relay function except the damaged one. up date Feb 3, 2023 2:12 AM: contacted ANMBEST about damaged relay they responded promptly and resolved the problem with a refund. updating to ⭐⭐⭐⭐⭐ for customer service.

I bought 2 of them, the electronic part is pretty good, you can decide if you want to trigger the relay with 0v or 5v, it has good LED indications to show if the module has power and if the relay is on or off, the problem is relay in this module are crap, TERRIBLE quality, both of the modules I purchased went bad, the one got one relay bad while I was testing my project, aka you have 4 relays, you are testing with only one and that one went bad. Then I use the second module and moved my project to production, relay only has to trigger once a day and this second module got the relay bad in less than a month. So in less than 30 on-off cycles the relays went bad.. So what a nice quality... Now whether you trigger the relay on or off it just remains on and you have to hit the relay for the spring to come back to off... Do not by them Updated review:: I just crack opened one relay, they do not even have a spring, so they are trusting in God knows what in order to go back to the original position once you cut the power

I use these on a Tram that goes up and down a steep slope. The relay board on the winch end is for up, down, fast and slow speed control. The relay board on the tram end is for steering via a linear actuator and for leveling the tram via another set of linear actuators. These relays are activated by arduino boards and activate larger high current relays. They are also easy to troubleshoot because each relay on the board has an led that lights up when relay is active. I have been using these for a year with no problems and considering the low price are a great investment.