I asked a friend of me to (help him) to buy a plain 8 port relay for his arduino project.
To my surprise he came back with 2 Arduino compatible shields from DFRobot both are 4 ports. (2 times 4 makes 8 too)
One is the 1.2 version and the other is the 2.1 version.
The 2.1 version is a mystery for me,
Even Google image search doesn't know of its assistance.
I couldn't find any documentation on their site about this product, but based on their forum some people use it too.
So i was hoping maybe someone knows where the manual can be downloaded, and the sample code.
Another thing i note these boards have a power connector, that surprises me a little as a relay board shouldn't use that much power wouldn't an Arduino Uno be enough to power them ?, or is it common that shield boards have a power connector, i never before had the luxury of a real arduino compatible shield.. so i wonder why this is (they didn't put 2 extra DC adapters in.. so i doubt its required).
PS (i asked this question on their site too, but out of experience i know the most advanced arduino engineers are on this site, i think i will have better luck here)