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 Post subject: Woo, Xensr and tape measure - at same time!
PostPosted: Fri Jan 15, 2016 8:30 am 
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Joined: Fri Sep 11, 2009 3:15 am
Posts: 1674
Someone please do this and post results!

I want the one calibrated to jump higher!

lol :naughty:

I dont knwo how they work, think they are awesome, but just cant get my head around how they can be accurate to within a few ms without using an estimation algorithm based on acceloration or whatever too - do fast accelerating kites (c kites) register as much as slower ones - ones that fly up slowly - or the other way around...

mythbusters comes to kiteforum...


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 Post subject: Re: Woo, Xensr and tape measure - at same time!
PostPosted: Fri Jan 15, 2016 8:35 am 
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Joined: Wed Nov 24, 2010 11:03 am
Posts: 350
Easy - just put pile of construction site level lasers on beach and receiver on kiter..

http://www.constructionsupplies.net.au/mce-lasers/lsrhk2-builders-laser-level-p-376.html


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 Post subject: Re: Woo, Xensr and tape measure - at same time!
PostPosted: Fri Jan 15, 2016 10:43 am 
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longwhitecloud wrote:

I dont knwo how they work, think they are awesome, but just cant get my head around how they can be accurate to within a few ms without using an estimation algorithm based on acceloration or whatever too


So, how do they do it? Integration!:)

https://www.khanacademy.org/math/integral-calculus/indefinite-definite-integrals/indefinite_integrals/v/antiderivative-acceleration


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 Post subject: Re: Woo, Xensr and tape measure - at same time!
PostPosted: Fri Jan 15, 2016 11:24 am 
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Inhuman wrote:
longwhitecloud wrote:

I dont knwo how they work, think they are awesome, but just cant get my head around how they can be accurate to within a few ms without using an estimation algorithm based on acceloration or whatever too


So, how do they do it? Integration!:)

https://www.khanacademy.org/math/integral-calculus/indefinite-definite-integrals/indefinite_integrals/v/antiderivative-acceleration


Before they double integrate z-axis acceleration to position they (IMU units) must orient themselves by using AHRS like Madgwick algorithm..

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 Post subject: Re: Woo, Xensr and tape measure - at same time!
PostPosted: Fri Jan 15, 2016 2:50 pm 
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Joined: Thu Jun 16, 2011 2:21 am
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joriws wrote:
Easy - just put pile of construction site level lasers on beach and receiver on kiter..

http://www.constructionsupplies.net.au/mce-lasers/lsrhk2-builders-laser-level-p-376.html

I found the lazer tapemeasure works well.I have it connected to a custom Bluetooth transmitter that sends data to my cell phone.I put a constant on feature with an upgraded battery for extended life.Mounted to the tip of my board for a true height reading.Working on the power output,trying to see if I can up power enough to cut through kite lines or leading edges for those pesky crowded days or for kook control.


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 Post subject: Re: Woo, Xensr and tape measure - at same time!
PostPosted: Fri Jan 15, 2016 4:51 pm 
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Joined: Fri Apr 04, 2014 4:01 pm
Posts: 340
Will that construction laser measure when it's bouncing off water?


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 Post subject: Re: Woo, Xensr and tape measure - at same time!
PostPosted: Fri Jan 15, 2016 6:16 pm 
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Joined: Thu Jun 16, 2011 2:21 am
Posts: 469
NHKitesurfer wrote:
Will that construction laser measure when it's bouncing off water?

I try to aim at it all the guys mowing the lawn on foils,I aim for their tin foil hats.


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