I'm putting together schematics for my YADIYA board (http://www.diydrones.com/forum/topics/yadiya-yet-another-diy), and I was wondering how many switches, pushbuttons, and LEDs should I use and for what (so I can label them properly). If you read my post above, you will see that I am trying to make this as general purpose and expandable as possible. Here are my thoughts so far:

LEDs
1. Power
2. GPS lock
3. Failsafe activated
4. Sensors ready (indicated sensors are "warmed up". See: http://www.diydrones.com/profiles/blogs/razor-6dof-imu-arduino-dcm)

Pushbuttons:
1. Reset
2. ?

Switches:
1. ?

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I might add a Mode LED if your autopilot has several modes, like ArduPilot (waypoint, rtl, fly-by-wire, manual)
That's a good idea. I can use an RGB led (like http://www.sparkfun.com/commerce/product_info.php?products_id=7844). 3 colors for the 3 modes, and off when in manual mode! Noted :)
Hi, I would think of 3 leds:
1. green: board has power
2. yellow: non-critical error (you can fly the plane manually, but autopilot won't work - can be sensor issues, also gps.)
3. red: critical error, unsafe to fly plane (at least one RX input is missing, voltage too low, etc)

I would connect serial display in order to get more detailed fault information when alarmed by led's.
I've seen some really nice surface mount LEDs that have three colors on the one LED.

Those are called individually addressable LEDs.  If you search around the YouTube videos you'll see some incredibly cool projects people have put together using arduino-controlled addressable LEDs.  Thus far, I haven't seen any attempts at incorporating strips of these for doing light shows on multirotors.  Seems like an apt project, though probably very power-consuming, and might require a dedicated power supply in the same way that an FPV system might. 

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