Kuman 5V 8 Channel Relay Shield Module Compatible with ArduinoIDE R3 1280 2560 ARM PIC AVR STM32 Raspberry Pi DSP K30

I got this to use with a Beaglebone Black. It seems reasonably well made and good value. Inputs drive OK directly from the BBB's GPIO pins. Haven't tested thoroughly yet, but would probably buy more.

work great with RPi :) Used to control lights.Very nice, cheap and fun.

Love it works excellent.

Works ok. Terminal blocks not great - they twist and screws easily knurl / strip.

perfect thank you!

These are a very handy set of relays, which can be driven off as little as 5V from a microcontroller. I'm using mine with an Arduino.A great feature of these is that they use optoisolators to protect your microcontroller from the high voltage side, There's also a reasonably sized gap in the PCB under the relay to stop high current jumping between the tracks in the PCB.One thing to note with these is that if your relay doesn't initially work, check to see that the VCC is connected to something and that the IN pins are connected so that they are grounded. To use an Arduino pin to switch these relays, switching the pin LOW will allow current to flow, energising the relay, and similarly setting it HIGH will de-energize it. A Red LED lights to show when the relay should be energised.There are three pins with a jumper connected across two of them. These pins are labelled GND, VCC, and JD-VCC respectively. If you move the jumper to short VCC and GND instead of VCC and JD-VCC, you can use GND to energise all of the relays.

Really easy to use and works exceptionally well. The only down side I found was; if you attach a high wattage transformer to one of the modules, it will fuse the relay open. Keep this to just normal mains (or less) appliances and it's excellent.

Great product, arrived quickly