Gasea 2 Packs Relay Module 4 Channel DC 12V with Optocoupler for Arduino UNO R3 MEGA 2560 Project 1280 DSP ARM PIC AVR STM32 Raspberry Pi

Great kit and easy to use

i could not have bought the parts for that price and work well for what i wanted

excellent quality works as defined.

Good for controlling small signals but if you’re going to control AC dont bother... The relays are rated at 10A 230V but thats not even close. I ran a few outside lights with one relay, total wattage of 50W (approx 200mA) and the relay began to stick ON. Im guessing the contacts welded together...changed it to a solid state and worked perfectly

Bought these in Jan 2022, not used until yesterday. Both modules did not work. LED comes on but relay does not operate.

I ordered three packs of these for a project and they come nicely packaged with each board in it's own heat-sealed antistatic bag. They come with no documentation at all, so a bit of circuit following and trial and error was required to make them work.The first thing that is apparent is that the relays fitted are all 12 V relays (TONGLING JCQ-3FF-S-Z) which DO NOT WORK if you energise them at 5 V.The main header contains 10 pins: GND, 8 inputs and VCC (which is all that is required if you tie them together, see above).The relays are switched on by pulling the input line low, at which point an LED is lit. If you power the whole board at 12 V, the voltage on these pins is around 9.5 V when they are not pulled low (the 12 V goes through a 2.2 k resistor, the opto-isolator and the LED). As such, I am very wary about hooking these pins up to an Arduino with the whole thing powered at 12 V.This means that in order to use the board safely with an Arduino (or other 5 V devices), you need two seperate power rails, one at 5 V and one at 12 V. The right hand side of the board has a specific header for this,, labelled GND, VCC (for the opto-isolators) and JD-VCC (for the relay power). I wired this up as GND, 5V and 12 V respectively.The boards come with a jumper fitted between the VCC and JD-VCC pins. If the relays were 5 V (or you could drive the whole thing at 12 V), this ties the two power rails together meaning you only need a single supply connection. Be aware that if you do this, you are tying the relay coil supply to your logic supply, removing some of the benefit of the opto-isolators!All-in-all, the boards are usable, but I was disappointed to need a 12 V supply when the product page images so clearly show 5 V relays.I can't speak to reliability, but I am about to start a long series of tests in which they will see thousands of cycles, so I will update as appropriate.

item works well, i bough these to fit into a display board at a museum there working with an Arduino UNO cycling some lighting.