RE: [Paparazzi-devel] distance measurement for landing.

[Elden Crom]

I was considering the pressure/altitude route

http://www.hobbycity.com/hobbycity/store/uh_viewItem.asp?idProduct=6776&Product_Name=WS_HowHigh_Altimeter_Feet_&_Meter_(New_Version)

But I think this may require one on the ground station as well to deal with a 
cold front coming in and changing the barometric pressure.

Supposedly, this thing can measure altitude accurately to 14cm.
Does anybody believe that? (I have on one order to see if it's actually that 
accurate)
I wonder how to mount it such that it is not affected by wind speed.




-----Original Message-----
From: Dirk-Willem van Gulik [mailto:address@hidden
Sent: Fri 11/6/2009 1:04 PM
To: address@hidden
Subject: Re: [Paparazzi-devel] distance measurement for landing.
 
Roman Krashanitsa wrote:

> The http://www.maxbotix.com/ founder did some comparison for performance
> of his sensors with Sharp sensors you are linking to. As far as I
> remember, there are some plots in the FAQ section and in "Preformance
> Data" section that might be useful for you.

I found that even very simple DIY shop ultrasonic meters; like below:

http://www.sella.co.nz/general/building-renovation/tools/other-tools/503tx7/

which can be had for 5 to 10 euro's at the local DIY market - are easily 
hacked and not that unreliable.


Thanks,

Dw

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