SainSmart 8-Channel Relay Module

All good Thank you

I attached this to my Raspberry Pi - Piface board and with 3 wires and a bit of python code got it switching a relay controlling a mains lamp on and off on command. A bit of HTML and its now working over my LAN from my Samsung S4. So really pleased with it so far. My ultimate aim is to get the PI controlling various mains appliances in response to the power being generated by my solar panels automatically.

I bought this relay module to hook up to my raspberry pi to allow me to control small appliances such as my desk lamp and it works like a charm i used a piece of rubber at the bottom so that i didn't short any of the connections only real downfall is that the raspberry pi won't power all the switches but that isnt a problem with this product.

Great piece of kit.Be aware that the default is "active low", so if you're controlling it from, say, a Raspberry Pi, setting a GPIO low will energize the relay, setting the pin high will due energize it.Had me slightly baffled for a while!

First things first: The module showed up on time packed well and no issues. Unfortunately I then had to surf the net for a few hours to put together a list of the board mounted components so as to assemble a knowledge base so I could use said board. Don't get me wrong! It wasn't rocket science or anything...just inconvenient as I assumed incorrectly that a schematic of some sort would have been included.So the board works. It is controlling some valves and works just fine. Paperwork would have been nice.

I have hooked this up to a Raspberry Pi and it works perfectly!This is a really inexpensive way to add relay control to the Pi, and not too big.Definitely going to be investigating the other products in this range...

Was going to build my own, this is the better option, save time and money.Great product and good quality.

excellent quality build.excellent arrangementthis is the perfect and most important component to start with when cinecting to high foltage automations.

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Very impressive ratings for the relays in terms of VAC and VDC and rather high amps. I cant yet answer how many cycles they will last-- if they last 10 000 closures, then they are perhaps not great, but if they last 100k, impressive. Also, they have excellent board quality, easy connections. All round, excellent value.

Excelente producto, muy bien fabricado y muy simple de utilizar. Lo recomiendo ampliamente a quien necesite hacer algún proyecto electrónico

Experience: Software engineer, learning electronics with my Arduino. My dad is an EE talked me through all current measurements.SETUP:- Connect arduino powersupply 5v to VCC- Connect arduino Digital ground to ground- Connect arduino digital output to any IN1-IN8- You're in business!CURRENT:I connected my meter in series and found I was drawing 64mA across the Arduino 5v power supply and 1.9mA across the Arduino output pin.I flipped it over and measured 7100ohms across the coil, meaning the coil is drawing 0.7mA at 5v.These numbers honestly seem a little low to me - e.g. I expected more like 19mA across the output, but 64mA across the power supply seems very reasonable with all eight relays drawing 400mA per the spec.Note: Arduino max power supply voltage is 500mA on USB, so you're good there too.PROS:- This won't blow up your Arduino.- I didn't realize this model had LEDs. I looked at the 4 relay model and the LEDs are bigger, but these are smaller and work great.- LED's in the circuit act as diodes. My dad told me when the field collapses on a DC coil it generates a negative voltage. If you don't have a diode in the way you could burn up your output transistor.- This has NC (Normal Closed) and NO (Normal Open) contacts on the high voltage side. So if you want your lights ON or OFF by default you can do that. It has a nice diagram on the board showing how the high voltage contacts are laid out.- Price- 4 mounting holes on the board if you need to bolt it to something!- Lot's of fun - you should buy one!CONS:- N/AOTHER:- The header PINs are really nice, but I only have male breadboard jumpers and need to buy some male-female jumpers from radio shack before I can hook this baby up to my xMas light setup!!