All you have to do is move the positive pin over one space to the outside of the connector. So there is an empty space between the positive and negative pins. If you leave the positive pin where it is, it will be connected to the 5V rail and will always be on. Move it over one to connect it to the actual AN port.
These ports can only handle ~10mA by themselves, so be careful.
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You can also plug small LED lights directly into the AN ports:
http://www.hobbyking.com/hobbyking/store/__16382__3_LED_Strip_Red.html
All you have to do is move the positive pin over one space to the outside of the connector. So there is an empty space between the positive and negative pins. If you leave the positive pin where it is, it will be connected to the 5V rail and will always be on. Move it over one to connect it to the actual AN port.
These ports can only handle ~10mA by themselves, so be careful.
Here's another way using a single cheap npn transistor, just not sure how to configure the free port :
http://www.multiwii.com/forum/viewtopic.php?f=15&t=1198&p=8...
Yeah check jD-IOBoard. It listens MAVLink and you can program different type patterns for different flight modes.
Here is simple connection diagram for it
You can find boards from our store at jDrones
Check out the jDrones IO board.