Relay Module with Optocoupler High/Low Level Trigger for Arduino (12, 12V Relay 1 Channel)

Update: I'm dumb. Not the manufacture or Amazons fault, for the failures. I made a miscalculation and was able to fix it. Even the company reached out to see what was wrong!!!Pre purchased these for a project that took a year and a half to finish. I am finally finishing up just to come to find out none of them work even with direct current to the coil leads. Out $15 and have to order something different. Will update as needed. At current time stay away from the single pack ones.

Works great with Raspberry Pi running HomeAssistant

They are what they are at a great price

I have 10 of these single relay 12vdc modules (so far). I use them for MANY applications.In one application, I am powering it from 11.5vdc from a small buck regulator to keep voltage stable.I am triggering from 11.5vdc through a 68k resistor so, = (about)1.6vdc gives me a high trigger. _|-|_For solar applications, I have pulled the relay off and used solid state relay! Easy Peasey!I have also used it to switch my 3000watt power inverter off and on with no relay at all.Yes, I pulled the relay, lifted pins 3 and 4 of the opto coupler out of the board, soldered wires to them. Inserted wires to COMMON and N.O. pads on the PCB!The inverter just needs a small make/break, positive action switch to control its power on / power off logic from its' wired factory remote.The opto couplers output does this perfectly and no relay sucking power.So, a combination of a programmable comparator and this great little board, I have and ATS (automatic transfer switch) controller for my solar which uses FAR LESS energy (and money) than any commercial unit out there. And it turns the inverter off and on! AND a fully programmable solution to meet my LiFePO4's requirements.There are no mechanical relays pulling ~100ma each on either board!When using solar, draining around a quarter amp at 12-13.6 vdc for 12 hours is a lot of waste.So, these little wonders can be used to drive pretty much anything!1- Stock relay works.2- Pull the stock relay and replace with solid state.3- Pull the stock relay out and lift pins 3 & 4 of opto coupler off the board and you can control logic with said pins!Triggers off of very low voltage too!My only CON is the wire capture strips. Really too small and rinky dink.

Works fine with the 3.3 logic level. I'm going to use this to control an automatic sprinkler system. Seems perfect so far. We'll see how long it lasts. Can't beat the price.

I've bought 4 of these, only because it's my only option without waiting 30-40 days for a better product direct from Asia.The 1st was DOA (1 or more channels did not work at all).The 2nd worked initially, but because I slightly "overtightened" (wasn't really too tight) the DC+ input terminal, the connection from that terminal to the board became loose and the unit would not reliably stay on. These things are made SOOOO cheaply!!!The 3rd and 4th were DOA (each had a different channel non-functional). I ordered 2 even though I just needed one, because I needed to work on it this weekend and knew my chances of getting a bad one were high. Guess I should have ordered 10 and hoped for 10% success rate?So now I'm waiting on replacements for the last couple of DOA units. And even if they work, I'll be forever worried that something is going to break and I'll have to take my entire project apart to replace the relay. What are the odds something like this will last 10 years or even 1 year, given how incredibly poorly it is made the the unbelievably high failure rate?I would gladly pay more for something that just works, but this seems to be the only option other than waiting a month or more. (And I will be ordering a couple of those to have on hand, but for now I can't wait that long to use them.)

I got the 24 volt version of this relay board, so I can't attest to the values of the other versions. I took one star off because the product information stated 50mA max current, and my board draws just over 100mA. That spec may have been for a different voltage board. Maybe a 5V board?The board, by itself, draws about 5mA with no relays active. Each relay coil draws about 24mA; so with all four active it pull just over 100mA.I'll be powering this with a 24VDC 1-Amp power supply. With with all eight relays active (four on each board), that will use about 20% of the power supply's capacity. Very good for my application.Edit: Updated to 5-stars. I figured the 50mA max rating was per relay, not 50mA for the board. Then it would be in spec.

Used to control a few small devices with a microcontroller. Well-constructed, clearly labeled, and no dead relays on the one I received