Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: NGuggemos on August 13, 2011, 10:40:10 PM

Title: Rangefinders
Post by: NGuggemos on August 13, 2011, 10:40:10 PM
What is a rangefinder capable of finding the range of something 50 feet away that is axon capable?
Title: Re: Rangefinders
Post by: Soeren on August 14, 2011, 03:58:44 AM
What is a rangefinder capable of finding the range of something 50 feet away that is axon capable?
Expensive.
Title: Re: Rangefinders
Post by: rbtying on August 14, 2011, 09:42:00 AM
Doesn't have to be - you could use a 50 foot long stick with a switch at the end, and a linear encoder switch to figure out how much of the stick was extended before hitting an object. (This would be more like a tape measure than a rangefinder... but wtv.)
Title: Re: Rangefinders
Post by: corrado33 on August 14, 2011, 10:11:12 AM
What kind of sensors do they use in those "follow behind" cruise control systems you see in cars?
Title: Re: Rangefinders
Post by: owk on August 14, 2011, 01:43:48 PM
would there be a way to hack the golf laser range finders and feed the info into an axon?
Title: Re: Rangefinders
Post by: Soeren on August 14, 2011, 03:14:49 PM
Hi,

would there be a way to hack the golf laser range finders and feed the info into an axon?
Of course... You just have to find it.

I'd rather hack a Bosch LASER tape though (range: a few cm to ~40m with a precision of ~1mm). - Far better than any Bushnell ranger I know of :)
Title: Re: Rangefinders
Post by: NGuggemos on August 18, 2011, 05:23:48 PM
Thanks for the suggestions!
Title: Re: Rangefinders
Post by: NGuggemos on August 18, 2011, 05:25:10 PM
Does anyone no where to buy these or how expensive they are???
Title: Re: Rangefinders
Post by: TrickyNekro on August 18, 2011, 06:57:18 PM
What is a rangefinder capable of finding the range of something 50 feet away that is axon capable?
Expensive.


That was surrealistic... You can always pinball it....

But hey, really now... You are surrealistic... I did some good research, feels like things have changed.
I mean 30 - 40 dollars.... That not expensive for such a system...

http://www.google.gr/#hl=el&sa=X&ei=vLNNTqSlN8fV4QTkkKm0Bw&sqi=2&ved=0CCEQBSgA&q=diy+laser+rangefinder&spell=1&bav=on.2,or.r_gc.r_pw.&fp=828907e1d731ed99&biw=1280&bih=839 (http://www.google.gr/#hl=el&sa=X&ei=vLNNTqSlN8fV4QTkkKm0Bw&sqi=2&ved=0CCEQBSgA&q=diy+laser+rangefinder&spell=1&bav=on.2,or.r_gc.r_pw.&fp=828907e1d731ed99&biw=1280&bih=839)
Title: Re: Rangefinders
Post by: rbtying on August 19, 2011, 10:38:57 AM
The ~$30 setups are only good for distances <3-4m, from what I recall - 50 feet is more in the range of 15m, and at that point you won't be able to detect the reflected laser light (short of getting a more powerful laser, or doing some filtering / modulation)
Title: Re: Rangefinders
Post by: TrickyNekro on August 19, 2011, 08:30:39 PM
The ~$30 setups are only good for distances <3-4m, from what I recall - 50 feet is more in the range of 15m, and at that point you won't be able to detect the reflected laser light (short of getting a more powerful laser, or doing some filtering / modulation)

You always need to play around with hacking.

Altering the focal plane (by varying the lens distance) and maybe getting a more powerful laser yes...

But... What matters really is the focal plane... No filtering etc...
Of course that way you are altering the sensitivity of the sensor, but in a digital world range comes with a price ;-)
Title: Re: Rangefinders
Post by: NGuggemos on August 25, 2011, 03:00:16 PM
Those sound like good ideas!