This is how I've mounted the ultrasonic range finder. It needs to be mounted some distance away from other electronics to avoid interference. I still don't know if this will work but it's a first try. Otherwise I'll have to find another solution. The range finder has a maximum range of five meters and should be pretty exact. I still have no clue how the flight controller will treat it's information in conjunction with it's on-board barometer. That's for the future to tell.
The other sensor, or should I say alarm, is a lost signal alarm. It reacts by emitting beeps after one minute of no change to the servo I've attached it to. It's currently attached to the throttle and so, if I don't change the throttle for one minute, it'll start beeping. I'd say the theory is that if you don't move the stick for more then a minute, your signal should probably be lost. Anyhow, then after another minute, it'll sound a more than 85dB beep until it's regained signal. In theory you should then be able to find your model if it's crashed somewhere out of sight. Cheap insurance policy.
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