thx for reply :smile: yes dragino HE works like yun I think. for linkit as the product seems new, there is a little bit less docs. but I will see, price was so interesting that it was too much tempting lol. I will tell you what I can get... for fun, I have not presented yet, but I have a board in progress for raildin : 8x relays + 8inputs for yun and I added ethernet connector+hub usb chip