Hello, what is the power rating of the two relays on the Arduino Opla board? I am looking to use it to switch the positive leg to a 12vdc compressor motor that draws a non-trivial amount of current, but I can't seem to find a data sheet for the Opla. I need to know whether I can use the onboard relays, or if I have to wire up an external relay with a higher rating using the 5v output. Sorry if this is a n00b question, but the Opla isn't cheap and I'd rather risk the humiliation than let the smoke out of the board.
I had never heard of Opla before seeing this thread so I went and had a look in the store. I'm not even seeing anything that even says Opla has relays, but that might just be me missing something.
Can you post a link to the page/s where you're getting your info so far?
Hey magentaline, thanks for your reply. It states on the product page that it has 2 relays, and I have the board in front of me. It has 2 relay outputs that are marked normally open, normally closed, and common as you'd expect.
Can you give a link to the product page please?
I'll take your word for it 
Can you post a photo of that part of the board?
Do you mean this...
Yes, that's correct. I need to know how much current they'll drive without burning them up. They will switch a normally open circuit to start and run a small 12vdc compressor motor, then run it continuously until an external input is supplied. I don't know how many starting amps or running amps will be required, as they're not documented, so I'll have to test it after the part arrives. If they're not rated high enough, I'll have to use a power source and a more heavy duty relay to switch it, by powering an external relay that is switched on/off by the smaller relays on the Opla. If that makes sense.
I don't think those connections are "from" a relay to drive a load; I think they're more likely to be connectors "to" a relay to control it. May be wrong though...
When I did a search in the store for Opla I saw this in one of the lists. That looks like a relay that would plug into those connectors to be controlled.
Yeah that's different. The Opla also has grove connectors, but they're not the same. A relay input is usually just power, like a wet contact. It's either energized or deenergized. The connector is clearly marked NO, NC, and COM, which is the standard output for a relay. Thank you for looking though, I appreciate it.
So you're satisfied the Opla itself has relays actually on the board. If they're those normal blue or black so-called "sugar cubes" they're normally marked with their ratings like on that Grove board. Or are they solid state?
Sorry I can't help....
Yes they are clearly relays, and are outlined in detail in the programming manual. Problem is, it only says "you can drive up to 24v". It doesn't say, "you can drive up to 24v @ 60amps".
Can you post a pic?
Update: I found the datasheet for the relays themselves. They are Axicom V23079, and will drive approximately 5 amps @ 12vdc. They are rated for up to 220vdc @ 0.2 amps.
Just had to pull the wifi shield off to get a better look.
That being said, looks like it's not a straight shot from the relay contacts to the relays, so the power rating of the relays likely doesn't matter. I need a magnifying glass and a 3rd hand to trace it 
Screw it I'll trigger an external relay. This is obv not heavy duty enough.
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