[exodust]

Sorry, but just saying "it can do it" without explaining how, is not convincing!

The magnetic switch in the video - I have used before, and they do not distinguish between "open" and "closed".

When someone opens the garage door, a notification is sent: "garage door open".

When someone CLOSES the garage door, a notification is sent: "garage door open".

Unless you can provide further explanation, the device only notifies of "activity", not specific activity such as open or closed. In which case, you're being a tad misleading.

[clement87]

I think you should try again to play with your magnetic switch. Here is some help: http://en.wikipedia.org/wiki/Reed_switch

[exodust]

Ok, thanks for the useful link (I think). When I played with wireless door sensors and Arduino, detecting door state reliably wasn't happening. Maybe it's the wired vs wireless factor that gives yours the edge. Maybe that's the trade off to know open/closed state with certainty, is to use wired sensors.