[Lab] range finding

[Darcy Whyte]

I want to just track their position on a line that's about 10 or 20 feet
long. I haven't figured the distance out yet but it will be something like
that...





--
Darcy Whyte

Art+ inventorArtist.com <http://inventorartist.com/> | Aviation
rubber-power.com
Contact: darcy at inventorArtist.com | 613-563-3634 by appointment (no text)



On Wed, Feb 5, 2014 at 3:14 PM, Adam Hill <theadbo at gmail.com> wrote:

> Hi Darcy,
>
> I've had occasion to think about similar things over the last couple of
> years. I wasn't sure what exactly you meant by '20 foot distance'.
> Do you mean track them in 3 dimensions inside a 20 ft radius? If so, then
> you probably want to go with machine vision (kinect (1st gen) is probably
> easier to get up and running but there are some libraries for doing this
> with a webcam (not as performant)).
>
> If you mean measure a linear distance from the source to the person, or a
> boolean indication of the presence of a person, up to 20ft away, then I
> would say something similar to the hardware you're currently using. I would
> note that in my experience these are not created equally. I like the MB1210
> (
> http://www.abra-electronics.com/products/MB1210-Ultrasonic-Range-Finder-%252d-XL%252dMaxSonar%252dEZ1.html).
> It was the most reliable out to just less than 20 ft, and is specifically
> calibrated for people detection.
>
> Good luck!
> -a
>
> On Wednesday, February 5, 2014, Darcy Whyte <darcy at inventorartist.com>
> wrote:
>
>> I was just thinking. In the endgame I want to be tracking a person moving
>> over a 20 foot distance.
>>
>> I'm starting to think I might need to try something else. Ideas?
>>
>>
>>
>> --
>> Darcy Whyte
>>
>> Art+ inventorArtist.com <http://inventorartist.com/> | Aviation
>> rubber-power.com
>> Contact: darcy at inventorArtist.com | 613-563-3634 by appointment (no text)
>>
>>
>>
>> On Wed, Feb 5, 2014 at 2:02 PM, Darcy Whyte <darcy at inventorartist.com>wrote:
>>
>>> Hi, I have one of these (I think)
>>> http://ramshackblog.blogspot.ca/2012/02/ultrasonic-range-finder-using-sdm-io.html
>>>
>>> It has four pins.
>>>
>>> I've got it working using the code at that page. It measures really well
>>> up to about 30cm then after that it just prints out 999 cm?
>>>
>>> I noticed with a piece of paper I can get further (around 70cm).
>>>
>>> It's supposed to be good for 150cm.
>>>
>>> Any ideas what's going on here?
>>>
>>> I have two of them and I tried the other one (in case it was a bu
>>> component). But same result...
>>>
>>>
>>> --
>>> Darcy Whyte
>>>
>>> Art+ inventorArtist.com <http://inventorartist.com/> | Aviation
>>> rubber-power.com
>>> Contact: darcy at inventorArtist.com | 613-563-3634 by appointment (no
>>> text)
>>>
>>>
>>
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