Measuring Altitude and Deploying Parachute

GoForSmoke:
We both know how well that takes to handling, wouldn't takeoff do the triggering?

Someone needs to invent a drone that can autorotate.

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Oh yeah, descent and take off must be factored in when coding the threshold of course.

Would I be able to do a simple signal blocker to block the signal when I do my landing / take-off process?