[Lab] range finding

[Adam Hill]

Great reference! Thanks for sharing

On Wednesday, February 5, 2014, Aurelius R <maxrowsell at gmail.com> wrote:

> 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<javascript:_e(%7B%7D,'cvml','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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