HiLetgo 2pcs DC 12V 2 Channel Relay Module with Isolated Optocoupler High and Low Level H/L Level Trigger Module Triggered by DC 12V

These are great relay assemblies. The fact they operate on the presence of + or - 12VDC and do not draw current on the signaling circuit is ideal for my application. I needed to control a pump with a negative lead signal and return a positive lead signal to the control board to activate an LED pump run indication. This device let me switch the pump and generate the positive signal for the LED. Very happy so far.

My Sony projector activated either 12V trigger A, or 12V trigger A+B, depending on the aspect ratio selected. I needed to change the second trigger function to be only B so that the wide screen would descend but the regular screen would retract. Some basic jumpering created the logic I needed and it has worked flawlessly for 6 years. I powered it from a separate PSU but don't remember why. Maybe the current on trigger A was too weak.

These relays function as expected. Installation was straightforward for my project, and I've had no issues during two years of use.

The Arduino Mega 2560 has a DC barrel connector that accepts 12V in. In order to get this relay to work I connect 2 wires to the VIN pin on the Arduino. VIN outputs 12volts if you have a 12v power source connected to the Arduino. The other end of these wires go to the DC+ terminal, and NO1 (or 2) when NO1 and NO2 are jumpered together. GND from the arduino goes to NC1 or NC2 which is jumpered. Then DC- goes to another GND on the arduino. I have IN1 and IN2 going to pins 7 & 8, but that's variable. The COM1 and COM2 terminals are connected to my 12v linear actuator. This works to open and close the relay. The way the LEDS light up is confusing . . . both light up when I expect only one to, but everything functions properly. NOTE that your board must put out 12v to power the relay (if you are powering from the board) like my the Arduino Mega 2560 does, but I believe (did not test, but according to documentation) pins 7&8 (in my case, or if you use other output pins) only put out 5 volts. SO . . . 5 volts is OK for setting the high or low signals, but you need 12v to power. I was confused by the seller's description which I misunderstood, and thought this couldn't work with Arduino at all. BUT BE WARNED . . . make sure your actuator is not drawing too much amperage for the board to handle. If that is the case you can power directly off of the 12v power source to the NO and NC terminals and bypass the VIN pin. However, you can still control the relay with the 5v pins to set HIGH and LOW . . . which the description led me to believe wasn't possible

I ordered the two pack the first time. One unit worked fine the other did not. The relays actuated fine but the front end electronics did not work. I ordered two more and they both came on time and worked fine. The board is small has mounting holes and terminal strips which making field wiring connections easy for both input and output. I have installed in my device and like it very much.

Used this in my Winnebago Class C RV to switch 120VAC for the battery charger mounted under the hood and the other circuit to switch on and off the heating strip I installed along the new main water line running in conduit under the rig. Only complaint would be the terminals are very small and had trouble getting 14 gauge wire to fit under the screws on the relay side. I typically like to crimp the fine stranded wire before placing under a terminal but the crimp for 14 gauge was too large for these terminals and the bare copper alone was a struggle to fit. There is a green LED when board is powered and then a red LED for each relay circuit that lights when its triggered. Picture shows board with relay 1 triggered. Great value as in the past I have paid double for a single 120VAC relay and this deal provides 2 boards each with 2 relays. Bargain! Each circuit is running around 3 to 5 amps which is half the rated load of each relay so hopefully they last.

These will actually run at 22 or so volts, so no problem subbing them into 16/18 volt controls.

These little relays are quick, reliable, and almost bullet proof! It's handy to have two sets of two relays, that are both DPDT and can be triggered by positive or negative switching! I used one to reverse polarity to a 12v servo to open a chicken coop door, and used the other one to choose whether to send the power through to the first relay or to a DPDT switch to manually control the door. I also had to use a diode to prevent the manual switch from sending power back through the normally closed contact of the first relay. Since it was reversing polarity, one of the positions would create a short. The diode did the trick. However in the process of figuring that out, I shorted these out (trial and error), but they did not damage. They are very tough built. I'm impressed!

JUST WHAT I NEEDED

soprattutto per la possibilità di scegliere il tipo di trigger (alto o basso). Si presta a molteplici applicazioni, economico e ben fatto. Soprattutto, averne due in una sola basetta.

I used this to wire up the Siren (bell) and Strobe light for our NVR. Being 2 channels in one piece board save us another unit. All those fit perfect into a small 1-gang box. Worked perfect, very happy with it

works well

I will be putting it into my sun seeker today the turn the solar cell to face the sun all day