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Topic: Maintain Hover At Given Height (Read 1 time) previous topic - next topic

roboticfan101

I want to get a propeller to get a helicopter to hover about 4-5 feet above the ground. I am trying to figure about how to do so, should i use a pressure sensor? Ping? Infared Distance Sensor? Any links to projects with good desriptions and code examples? Thanks so much everyone!

Grumpy_Mike

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should i use a pressure sensor?

No there is not enough variation in atmospheric pressure to detect 4 feet.

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Infared Distance Sensor?

No you get light interference and the uncertain nature of the reflecting surface will lead to unreliable operation.

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Ping?

Best of the three but not to sure about the reflectivity of the surface and any turbulence caused by the copter.

PeterH

I've read about people achieving surprisingly good resolution with a pressure sensor so that seems like a viable option as long as you get a sensor with adequate resolution. There are ping sensors that operate up to that sort of range, but I don't know how well they would work just reflecting off ground, especially if they're in a noisy environment.

I assume you have recognised the separate problems of holding the vehicle level and stationary.
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CrossRoads

I'm thinking tie a string to a big rock and  hold full up hover power ;)

No serious suggestion tho ...
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fungus

#4
Nov 09, 2012, 10:02 am Last Edit: Nov 09, 2012, 10:31 am by fungus Reason: 1

I've read about people achieving surprisingly good resolution with a pressure sensor


To within a few inches of altitude? Underneath a helicopter rotor?


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Ping?

Best of the three but not to sure about the reflectivity of the surface and any turbulence caused by the copter.


I don't think low frequency turbulence will affect ultrasonic sounds much... but yeah, lawns, carpets, etc. aren't very reflective.


I got no ideas though. You might be able to cheat if it's in a fixed, known environment.

If you just want to go out onto a field and expect it to work...that's a difficult problem. The only thing that occurs to me is have an external sensor that can see the height of the helicopter (a "human" is commonly used for this but you might be able to automate it...)



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