[Lab] range finding

[Aurelius R]

On The Amp Hour recently (the best podcast ever, by the way) they had a
guest on talking about his new book "Small and Short Range Radar Systems".
His name is Greg Charvat and the podcast is
http://www.theamphour.com/179-greg-charvat-returns-with-a-book-laboratory-literature-laureate/

I would seriously recommend looking into that technology. People always
think of radar as this advanced, difficult technology but it's actually
very easy to set up and use. The interview is great (usually there's two
hosts, Chris Gammell and Dave Jones, but Dave was gone that week) and it's
well worth subscribing to their podcast. I've been listening to it for a
long time now and I never miss a week.

____________________
Peace, Love, Empathy

Alexander Max Rowsell


On 5 February 2014 15:14, 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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