The board works fine when I have the wall-wart turned. However, I sometimes accidentally turn off the wall-wart and then it's powered by usb. Usb power does not work the relays, wh...

Hey, I have tried this shield but can't get it to work. It seems that I can control the pin state with a simple script since the corresponding LED for each relay lights up on the board. But the relay(s) does not switch (close/open). The NC remains closed and the NO remains open regardless of the associated input pin state. I first connected between COM and NO or NC a 12 V driver to control a LED strip and then a simple resistor/LED test circuit powered by the 5 V from the arduino. I also got a new shield to make sure the first one was not defective but same result with the test circuit. Did I miss anything obvious? Could it be because I am using an Arduino Uno R3 clone?

What gauge wire can the screw terminals accept? I bought a relay board and the screw terminals won't accept 14GA cable. I understand that for a max of 5A load a 14gauge wire is unnecessary but that was the gauge wire the system to which I'm connecting uses.

Is it OK if I power the board with 12VDC instead of 9V?

hi, can i use an arduino mega with this shield?

The jumper pins seem to be non standard. My female jumper wires fit very loosely on the central jumper headers.

Jn Md, did you ever get the wifi bee-esp8266 to work on this relay board? and were you using just the ESP8266 or did you have this shield on an UNO? I've bought all three items (UNO, wifibee, and relay shield) but don't have quite the know how to figure it out quickly.

udins9, did you ever get the wifi bee-esp8266 to work on this relay board? and were you using just the ESP8266 or did you have this shield on an UNO? I've bought all three items (UNO, wifibee, and relay shield) but don't have quite the know how to figure it out quickly.

Thanks Wendy for the response. Good advice. I found a supplier in Canada for 4 Channel 10 Amp relay module and will order there.
Thanks so much

No. Just plug it into the shield.

Will this board work with a Mega? I'm running out of pins, and may need to move up to a mega. This board meets other needs I have.

I recently got this board and it's amazing! Because the relay's power supply is totally separate, they do not add any noise to my analog readings. Great!
However i thing your choice of pins used to drive relays is unfortunate. The same ones are used by the Ethernet shield, especially your W5200 shield, i am having to make connections to pins 8 and 10.
Do I understand right that the Servo PWR can be directly connected to external power supply and will drive all the power rails on the board? How does that work with the power supplied from Arduino's regulators?

Can it use the Vin pin on Arduino for power?
That way I could plug in the power supply just in into the Arduino, and the board would still draw from the wall-wart, not the Arduino's on-board Regs.

Can this shield also be used with a intel edison breakout board?

I'm sorry,there has not a good way to detect which power the board got. May be you can demultiplexed wall-wart to a light or something:) or step-down to 5v and use arduino digitalread/analogread to detect power