First, let me say that ideas like this are near and dear to my heart. As a software dev with a hardware background who's worked in Embedded Systems his entire career, I love this stuff and I enjoy helping people on online forums.

That said, I simply won't join a site that doesn't tell me much about what it does before I have to sign up. I need to browse. I need to see what the average level of discourse is. I know what level I want to engage people at and I've been at this long enough to grow tired of the "how do I blink an LED with my Arduino?" questions. Nothing wrong with that -- everyone starts somewhere -- but it's not for me.

You're competing with, among others, http://electronics.stackexchange.com/ and http://robotics.stackexchange.com/ Show me how you're different/better before I decide to sign up.