Thread: Discussion Variometer for FPV landing
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Old May 15, 2012, 09:13 AM
Alphactif is offline
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There s no way to use ultrasonic reflection differently ?
If we sent a constant amplitude (or volume) of ultrasonic sound, the amplitude or reflected sound will be highter than the distance to the ground is low.
No need to calculate time between sent and reception sound.

Other idea is based on two laser diodes, we will observe two red points in ground, more ground clearance decreases more points are close
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