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</o:shapelayout></xml><![endif]--></head><body lang=EN-CA link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There has been some interesting research recently about tracking people passively with Wi-Fi signals, similar to radar…<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Sonar or radar sound the easiest from in terms of tracking the distance as a person is moving away / towards you on a line. If the line is orthogonal to the sensor, then using video might be easiest. You might also want to consider hacking a cheap laser range finder, like the ones that are used to measure rooms.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-Matt<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Lab [mailto:lab-bounces@artengine.ca] <b>On Behalf Of </b>Darcy Whyte<br><b>Sent:</b> 2014.February.05 15:20<br><b>To:</b> Adam Hill<br><b>Cc:</b> lab<br><b>Subject:</b> Re: [Lab] range finding<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>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...<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><div><p class=MsoNormal><br clear=all><o:p></o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>--<o:p></o:p></p></div><div><p class=MsoNormal>Darcy Whyte<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Art+ <a href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> | Aviation <a href="http://rubber-power.com/" target="_blank">rubber-power.com</a><o:p></o:p></p></div><div><p class=MsoNormal>Contact: <a href="mailto:darcy@inventorArtist.com" target="_blank">darcy@inventorArtist.com</a> | 613-563-3634 by appointment (no text)<o:p></o:p></p></div></div></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Wed, Feb 5, 2014 at 3:14 PM, Adam Hill <<a href="mailto:theadbo@gmail.com" target="_blank">theadbo@gmail.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal>Hi Darcy,<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>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'. <o:p></o:p></p></div><div><p class=MsoNormal>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)). <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>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. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Good luck!<o:p></o:p></p></div><div><p class=MsoNormal><span style='color:#888888'>-a<o:p></o:p></span></p></div><div><div><div><p class=MsoNormal><br>On Wednesday, February 5, 2014, Darcy Whyte <<a href="mailto:darcy@inventorartist.com">darcy@inventorartist.com</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal>I was just thinking. In the endgame I want to be tracking a person moving over a 20 foot distance. <o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I'm starting to think I might need to try something else. Ideas?<o:p></o:p></p></div></div><div><p class=MsoNormal><br clear=all><o:p></o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>--<o:p></o:p></p></div><div><p class=MsoNormal>Darcy Whyte<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Art+ <a href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> | Aviation <a href="http://rubber-power.com/" target="_blank">rubber-power.com</a><o:p></o:p></p></div><div><p class=MsoNormal>Contact: <a href="mailto:darcy@inventorArtist.com">darcy@inventorArtist.com</a> | <a href="tel:613-563-3634" target="_blank">613-563-3634</a> by appointment (no text)<o:p></o:p></p></div></div></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><div><p class=MsoNormal>On Wed, Feb 5, 2014 at 2:02 PM, Darcy Whyte <<a href="mailto:darcy@inventorartist.com">darcy@inventorartist.com</a>> wrote:<o:p></o:p></p><div><p class=MsoNormal>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><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>It has four pins.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>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?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I noticed with a piece of paper I can get further (around 70cm). <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>It's supposed to be good for 150cm. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Any ideas what's going on here?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>I have two of them and I tried the other one (in case it was a bu component). But same result...<o:p></o:p></p></div><div><div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>--<o:p></o:p></p></div><div><p class=MsoNormal>Darcy Whyte<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Art+ <a href="http://inventorartist.com/" target="_blank">inventorArtist.com</a> | Aviation <a href="http://rubber-power.com/" target="_blank">rubber-power.com</a><o:p></o:p></p></div><div><p class=MsoNormal>Contact: <a href="mailto:darcy@inventorArtist.com">darcy@inventorArtist.com</a> | <a href="tel:613-563-3634" target="_blank">613-563-3634</a> by appointment (no text)<o:p></o:p></p></div></div></div><div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></div><p class=MsoNormal><br>_______________________________________________<br>Lab mailing list<br>1. subscribe <a href="http://artengine.ca/mailman/listinfo/lab" target="_blank">http://artengine.ca/mailman/listinfo/lab</a><br>2. then email <a href="mailto:Lab@artengine.ca">Lab@artengine.ca</a> to send your message to the list<o:p></o:p></p></div><p class=MsoNormal><o:p> </o:p></p></div></div></body></html>