<div dir="ltr">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 <a href="http://www.theamphour.com/179-greg-charvat-returns-with-a-book-laboratory-literature-laureate/">http://www.theamphour.com/179-greg-charvat-returns-with-a-book-laboratory-literature-laureate/</a><div>
<br></div><div>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.</div>
</div><div class="gmail_extra"><br clear="all"><div>____________________<br>Peace, Love, Empathy<br><br>Alexander Max Rowsell<br></div>
<br><br><div class="gmail_quote">On 5 February 2014 15:14, Adam Hill <span dir="ltr"><<a href="mailto:theadbo@gmail.com" target="_blank">theadbo@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi Darcy,<div><br></div><div>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'. </div><div>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)). </div>
<div><br></div><div>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 (<a href="http://www.abra-electronics.com/products/MB1210-Ultrasonic-Range-Finder-%252d-XL%252dMaxSonar%252dEZ1.html" target="_blank">http://www.abra-electronics.com/products/MB1210-Ultrasonic-Range-Finder-%252d-XL%252dMaxSonar%252dEZ1.html</a>). It was the most reliable out to just less than 20 ft, and is specifically calibrated for people detection. </div>
<div><br></div><div>Good luck!</div><span class="HOEnZb"><font color="#888888"><div>-a</div></font></span><div class="HOEnZb"><div class="h5">
<div><br>On Wednesday, February 5, 2014, Darcy Whyte <<a>darcy@inventorartist.com</a>> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">I was just thinking. In the endgame I want to be tracking a person moving over a 20 foot distance. <div><br></div><div>I'm starting to think I might need to try something else. Ideas?</div></div><div class="gmail_extra">
<br clear="all"><div><div dir="ltr"><br><div><div><br></div><div><div>--</div><div>Darcy Whyte</div><div><br></div><div>Art+ <a href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> | Aviation <a href="http://rubber-power.com/" target="_blank">rubber-power.com</a></div>
<div>Contact: <a>darcy@inventorArtist.com</a> | <a href="tel:613-563-3634" value="+16135633634" target="_blank">613-563-3634</a> by appointment (no text)</div></div></div><div><br></div></div>
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<br><br><div class="gmail_quote">On Wed, Feb 5, 2014 at 2:02 PM, Darcy Whyte <span dir="ltr"><<a>darcy@inventorartist.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Hi, I have one of these (I think) <a href="http://ramshackblog.blogspot.ca/2012/02/ultrasonic-range-finder-using-sdm-io.html" target="_blank">http://ramshackblog.blogspot.ca/2012/02/ultrasonic-range-finder-using-sdm-io.html</a><div>
<br></div><div>It has four pins.</div><div><br></div><div>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?</div><div><br></div><div>
I noticed with a piece of paper I can get further (around 70cm). </div>
<div><br></div><div>It's supposed to be good for 150cm. </div><div><br></div><div>Any ideas what's going on here?</div><div><br></div><div>I have two of them and I tried the other one (in case it was a bu component). But same result...</div>
<div><div dir="ltr"><br><div><div><br></div><div><div>--</div><div>Darcy Whyte</div><div><br></div><div>Art+ <a href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> | Aviation <a href="http://rubber-power.com/" target="_blank">rubber-power.com</a></div>
<div>Contact: <a>darcy@inventorArtist.com</a> | <a href="tel:613-563-3634" value="+16135633634" target="_blank">613-563-3634</a> by appointment (no text)</div>
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