ED

!ArduPilot Mega board

http://ardupilot-mega.googlecode.com/svn/ArduPilotMegaImages/APM.jpg

**LEDs:**	**Behavior:**
Power	On when powered
MUX	On when mode toggle switch is not in manual position
PPM	Flashing when PPM encoder is working

IMU Shield

http://ardupilot-mega.googlecode.com/svn/ArduPilotMegaImages/LEDs.jpg

**LEDs:**	**Behavior:**
Power	On when powered
TX	Shows data coming in USB/FTDI port
RX	Shows data going out on USB/FTDI port
ABC	Fast flashing while calibrating gyros, then pause, then rotation flashing (about 45 seconds total). After that, B is solid on and C blinks while waiting for GPS lock; When GPS lock is achieved C will go solid on, too, and you are ready to fly

Note: in the 1.0 Beta code there is a slight bug in the !MediaTek setup routine, which requires you to reset your board after a cold start before the GPS lock will be registered. So if you're using the !MediaTek GPS, wait until the blue lock LED on that module goes solid, then press the reset button on your APM board or shield. This will do a warm start of the board, and the LED behavior should be as shown in the table above.