HiLetgo 2pcs 5V One Channel Relay Module Relay Switch with OPTO Isolation High Low Level Trigger

compact and works as stated

Wiring was super intuitive and everything just worked. I was able to power, ground and provide signal all from Arduino and then pull 12V DC from a 4A dedicated power source and connect it directly to the 12V DC magnet when the relay receives a signal. Perfect solution for my secret bookcase door project!Only note was that the relay screws needed the perfect sized screw driver because it felt like it was going to strip with the one little screwdriver I use for everything so I had to get a new small screwdriver kit and then i was able to repeatedly install and change configurations on this board without any problem.

As per usual another solid product from HiLetgo. I have been ordering from them since 2020 quite often. It started out because of the price and reviews mostly good. Now I always try and use this company from resistors to diodes to relays ect. I've only received 1 bad ESP32 and all it took was a soldering iron and 30 seconds and I was on my way. I ordered their relays 3 years ago and the same ones are going strong. So; I ordered these and wasn't let down upon opening.

Works well, but it is NOT a bistable/self-latching relay. Requires power for the NO contact to remain closed after engaging the relay (and the opposite for the NC contact). The control line (marked "IN") must be held to the same level as the jumper to keep the relay engaged, i.e. if the jumper is L, IN must be 0V/Ground/Low, if the jumper is H, IN must be 5V/High.Info: 5V relay uses 1ma with relay off and 64ma with relay on.I'll probably find a use for these relays, but I am disappointed that they are not true self-latching relays.I don't know the duty cycle of the relay, but it gets slightly warm after a minute, and I've left it on for at least 10 minutes straight so far with no problem.

With the caveat that its only been running a few hours, seems good so far. Very simple and easy to connect to my 3.3 Volt Arduino Nano 33. I used 5 volts to power the relay and a 3.3v pin for signal and that seems to work just fine.If I wanted to nitpick, it would be nice if it had solder holes and not just screw terminals. Screws are good for my breadboard prototype; not so much on my final design. So I will try to remove the screw terminals by de-soldering.

I've attached a photo of the relay module schematic. I Ohm'd and traced it out. Now the function of the 2-pin jumper is fairly clear. In my case, I want the coil to be active when the input (IN) is a logic high (3.3V) from an Arduino. Thus, I want the jumper as shown in the schematic (photo).

These are simple and work great! They DO NOT LATCH. You have to use a controller of some sort for them to latch or have a timed relay. These are momentary if you're using a simple switch. They are timed if you're using a controller.The price and quality is fantastic. There's a self-latching version if you do the same search with "self-latching" in your search.

It works at the beginning, but broken after three weeks controlling Christmas lights.I used the little relay to control Christmas lights blinking every night. About 650 blinks per night. It was easy to setup and the green/red operation LEDs on board were very helpful. Initial runs were smooth and successful. However, the relay was broken after 20 days of operation. The relay module failed. The NC is not connecting anymore. Luckily, the package came with two relays. So, I replaced it with the second relay, and it works again. Hope it runs longer this time, at least finish this holiday season.