SainSmart 5V 2A 8 Channel Solid State Relay Module High Level Trigger Black for Arduino Uno Duemilanove MEGA2560 MEGA1280 ARM DSP PIC

I only needed 3 channels of this relay module (the 8 channels gives me spares....), but it allowed me to make an inexpensive 3 channel chase light system using an ARDUINO UNO R3 as the brains. With programming the Arduino, you can make any combination of chase, forwards, backwards, fast, slow etc. With 2 amps per channel, that is enough amperage to run 30 of the 7 watt C7 bulbs per channel (technically you could do 34 bulbs, but you never want to load something 100% of rated).

As long as you realize 2 things, these are awesome.1. They work only with AC2. They require a load. They can't be used as just normal "switches" like people use mechanical relays.

I purchased this relay board for an aquarium controller project. Upon inspection, I found that there was a missed solder joint on the channel 4 output. I figured it was easier to solder it than to wait for a replacement. Unfortunately, channel 4 still didn't work after assembly. The light comes on but no output. The solder joint I made was on the output terminals, not the relay itself and I have good continuity from the terminal to the relay terminal itself, so not a problem there. Assume it's just a coincidence that the same relay channel had the problem. The rest of the 7 relays are great, nice and quiet, which is the reason I ordered the solid state model in the first place.

This solid state relay module has a transistor input circuit with an indicator LED on every channel, which makes it compatible with 3.3V and 5V interfaces. Even both at the same time if needed. The screw terminals on the power connectors are very strong. My only wish would be a shorting bar to connect all the hot screws together easier.

Very easy to use with an Arduino. Just needs 2 wires for GND + 3.3V and 8 wires for the 8 relays. You can use the newer arduinos that are in 3.3 V logic or a Raspberry Pi GPIO (also in 3.3 V logic) or any of the older Arduino (Uno, Mega) which are 5V.The outputs relays are silent -- search "OMCRON G3MB-202P" for the datasheet.These are zero-crossing PhotoTRIACs with snubber circuits. Their load rating is up to 2 A at 100-250 VAC.Works fine with low-voltage 16 VAC too, for example model train accessories power supply.[Edit] To clarify one thing: the solid state relays use triacs (TRIAC=triode for alternating current) which means the relays will only close when using an AC load. You cannot drive a DC load with these. If you like a schema to understand things, consider this:[arduino] ---[3.3V or 5V DC]---> [SainSmart SSR] <---[AC]---> [Circuit to be controlled]The outputs per relay only have 2 screws for an NO connection.If you need an application with NO/NC or if you need to drive a DC load, you may want to try the 5 V  SainSmart 8-Channel Relay Module .

I used these for a Christmas light controller. They are silent and fast and very easy to drive. I connected directly to RasPi zero w, and had a light controller running really quickly.

When you tighten the screws on the output side, the whole block actually twists on the PCB block - I feel like if I tighten anymore they's rip off the board (but they didn't - and they all work fine). All the output blocks are at a light odd angle. Just make sure you hold them straight when tightening the screws. Other than that they are great.

X-mas lights show is in productions. Tested my setup and configurations. All work well.

seulement 6 des 8 canaux fonctionnent... problème avec pieces omron, défectueuse mais ne semble pas avoir été testé après soudure sur plaque de montage...

Wenn man nichts negatives findet kann man auch keine Punkte abziehen. Die Relais tuen was sie sollen.Hab sie im Einsatz mit einem Arduino und alles funktioniert tadelos wie es soll.