6Pack 2 Channel DC 5V Relay Module with Optocoupler Relay Board for Arduino Raspberry Pi MEGA2560

Only includes 10 DuPont wires. Each relay module needs 4 wires so make sure you have more wires if you plan to hook up more than 2 of the 6 modules. Build quality is good. Soldering of components is high quality. Input/output terminals are well marked. Works perfectly with an Arduino board. The terminals can be a bit hard to insert a wire crimped with a ferrule but the connections are secure once I was able to get the wires in.

Love the functionality and versatility of these. I used one for a watering system for my baby tomatoe plants using a raspberry pi. Easy to wire up.

Excelente producto

Only triggers on high. Not selectable.

Can be tricky to understand wiring so research it if you are new to using these. Once you understand that they are cool

GREAT addition for my hobby project

In the first package of these, at least one of the two relays on each board would not click when switched on, until I tapped it with my finger. I checked the operation with a multimeter, they were sticking and not switching on. Returned that set and got another one, it was exactly the same. I took the one board that had two working relays and cycled them on and off for a few minutes. After a minute or so they both just stopped clicking, until I tapped on them again. The second set was returned as well. I will have to find something like this from another source. Several different "brands" of these boards on Amazon have the exact same brand of Songle relay on them.

Great relay modules using industry standard components. These are what SainSmart used to carry but they no longer list dual relay modules. Given the price for this, I think I understand why. I had actually looked there first, noted they don't sell them any more, then hit AMZ and found them here. I have modules from both sources and these are exactly the same - same pcbs, same components, same placement, etc. Good stuff!