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This is the third iteration of my Ardupilot Mega to Hitec telemetry adapter. Adapter no longer requires modifications to APM itself, but instead connects to telemetry port of APM and it has a pass through connector for telemetry transmitter. I made PCB this time using SMD parts for smaller size:

It's possible to have the device automatically display different information based on airframe type. Currently shown vario and airspeed readings are not that useful for hexa, but for example heading might be. I just got my hexa so I've yet to decide what to show. Unfortunately compared to previous versions, it's not anymore possible to show "mAh used" reading since to my understanding that information is not sent in any mavlink message. When using different types of batteries, that information would be more useful than percentage remaining reading. Should we add mavlink message for it?

For more information about the device and sources, see http://antibore.wordpress.com/2013/02/28/showing-apm-telemetry-data-on-hitec-auroras-screen-3rd-edition/

Now if I only could get my hands on some different telemetry capable systems, I could try to make this adapter universal one...