<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Rodney, <div class=""><br class=""></div><div class="">Sure, here is what I am thinking. </div><div class=""><br class=""></div><div class="">I am working with <a href="http://walkyourcity.org" class="">walkyourcity.org</a> to see if putting up signage in downtown Raleigh will increase pedestrian traffic. To measure this, we have been putting an 18” cable guard across the sidewalk with a vibration sensor inside. When a pedestrian steps on the cable guard, we register an event.</div><div class=""><br class=""></div><div class="">There are a couple advantages with this approach:</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- cable guards do not attract much attention</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- the sensor is completely hidden and protected</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- power usage is low so we can leave it for a couple weeks</div><div class=""><br class=""></div><div class="">However, there are some downsides as well:</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- it can’t tell which side of the sidewalk the person is on (can infer direction)</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- it might not count each pedestrian if two cross at the same time</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- sometimes the cable guard gets moved especially on trash day (don’t ask)</div><div class=""><br class=""></div><div class="">So, I was thinking about a sensor which could be mounted on a pole between the street and the sidewalk and oriented (perpendicularly?) to the walkway. Then we could count each unique range getting a better count and perhaps even getting a sense of which way folks are walking (if you assume Americans walk on the right most of the time).</div><div class=""><br class=""></div><div class="">Some thoughts: </div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- IR beam - having to put a reflector on the other side and worry about alignment could be an issue</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- TOF - cool but unless you want to spend <a href="http://www.teraranger.com/product/teraranger-one-distance-sensor-for-drones-and-robotics/" class="">150 Euros for the CERN model,</a> will lack the range needed.</div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- Ultrasonic - <a href="https://www.sparkfun.com/products/11724" class="">Expensive if you want one that works outdoors</a> and don’t get be started on those cheap Chinese HC-105s - also power hungry</div><div class=""><br class=""></div><div class="">I think I will try this <a href="https://www.sparkfun.com/products/8504" class="">Ultrasonic sensor</a> for a test unless you or anyone else on the list might have a better suggestion. </div><div class=""><br class=""></div><div class="">Thank you all in advance.</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">Charles McClelland</div><div class=""><a href="mailto:chip@mcclellands.org" class="">chip@mcclellands.org</a></div><div class="">919-624-5562</div><div class=""><br class=""></div></div><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"><br class="Apple-interchange-newline">
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<br class=""><div><blockquote type="cite" class=""><div class="">On Feb 13, 2015, at 5:01 PM, Rodney Radford <<a href="mailto:ncgadgetry@gmail.com" class="">ncgadgetry@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><p dir="ltr" class="">Could you describe what you are hoping to measure, or your intent?</p><p dir="ltr" class="">Perhaps there are alternatives...</p>
<div class="gmail_quote">On Feb 13, 2015 3:30 PM, "Charles McClelland" <<a href="mailto:chip@mcclellands.org" class="">chip@mcclellands.org</a>> wrote:<br type="attribution" class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word" class=""><div class="">Rodney, </div><div class=""><br class=""></div><div class="">Glad you mentioned the short range, was about to buy one! Looks like I will need to use the good old fashioned ultrasonic sensor unless someone knows of a version with a 3m range.</div><div class=""><br class=""></div><div class="">I am interested in one that can be used outdoors and will be able to ignore noise. I have used the cheap HC-105 but they are too unreliable. The Maxbotix sensors are much better but 5x the price. The <a href="http://www.amazon.com/Maxbotix-MB7060-XL-MaxSonar-WR1/dp/B00A7YH6M4/ref=sr_1_1?s=industrial&ie=UTF8&qid=1423859198&sr=1-1&keywords=outdoor+ultrasonic" target="_blank" class="">outdoor version</a> is more expensive sill at $100. </div><div class=""><br class=""></div><div class="">Any other ideas for an outdoor distance sensor that would be reliable and resistant to noise?</div><div class=""><br class=""></div><br class=""><div class="">
<div style="letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; word-wrap: break-word;" class=""><div style="letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; word-wrap: break-word;" class=""><div class="">Charles McClelland</div><div class=""><a href="mailto:chip@mcclellands.org" target="_blank" class="">chip@mcclellands.org</a></div><div class=""><a href="tel:919-624-5562" value="+19196245562" target="_blank" class="">919-624-5562</a></div><div class=""><br class=""></div></div><br class=""></div><br class=""><br class="">
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<br class=""><div class=""><blockquote type="cite" class=""><div class="">On Feb 13, 2015, at 1:36 PM, <a href="mailto:triembed-request@triembed.org" target="_blank" class="">triembed-request@triembed.org</a> wrote:</div><br class=""><div class="">Send TriEmbed mailing list submissions to<br class=""><span style="white-space:pre-wrap" class=""> </span><a href="mailto:triembed@triembed.org" target="_blank" class="">triembed@triembed.org</a><br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""><span style="white-space:pre-wrap" class=""> </span><a href="http://mail.triembed.org/mailman/listinfo/triembed_triembed.org" target="_blank" class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org</a><br class="">or, via email, send a message with subject or body 'help' to<br class=""><span style="white-space:pre-wrap" class=""> </span><a href="mailto:triembed-request@triembed.org" target="_blank" class="">triembed-request@triembed.org</a><br class=""><br class="">You can reach the person managing the list at<br class=""><span style="white-space:pre-wrap" class=""> </span><a href="mailto:triembed-owner@triembed.org" target="_blank" class="">triembed-owner@triembed.org</a><br class=""><br class="">When replying, please edit your Subject line so it is more specific<br class="">than "Re: Contents of TriEmbed digest..."<br class=""><br class=""><br class="">Today's Topics:<br class=""><br class=""> 1. Re: [TAR] New TOF (time of flight) distance sensor from<br class=""> Sparkfun (Randy Farmer)<br class=""> 2. Re: [TAR] New TOF (time of flight) distance sensor from<br class=""> Sparkfun (Rodney Radford)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Fri, 13 Feb 2015 13:21:19 -0500<br class="">From: Randy Farmer <<a href="mailto:randy.farmer@gmail.com" target="_blank" class="">randy.farmer@gmail.com</a>><br class="">To: <a href="mailto:trianglerobotics@yahoogroups.com" target="_blank" class="">trianglerobotics@yahoogroups.com</a><br class="">Cc: TriEmbed Discussion <<a href="mailto:triembed@triembed.org" target="_blank" class="">triembed@triembed.org</a>><br class="">Subject: Re: [TriEmbed] [TAR] New TOF (time of flight) distance sensor<br class=""><span style="white-space:pre-wrap" class=""> </span>from<span style="white-space:pre-wrap" class=""> </span>Sparkfun<br class="">Message-ID:<br class=""><span style="white-space:pre-wrap" class=""> </span><CAFKBHwNp240BVWLAbr1vArmSKeCa7T84gy=<a href="mailto:iUSYFjkAqN%2BdOCA@mail.gmail.com" target="_blank" class="">iUSYFjkAqN+dOCA@mail.gmail.com</a>><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">Cheaper breakout with just the sensor:<br class=""><br class=""><a href="https://www.sparkfun.com/products/12784" target="_blank" class="">https://www.sparkfun.com/products/12784</a><br class=""><br class=""><br class="">On Fri, Feb 13, 2015 at 1:14 PM, Rodney Radford <a href="mailto:ncgadgetry@gmail.com" target="_blank" class="">ncgadgetry@gmail.com</a><br class="">[trianglerobotics] <<a href="mailto:trianglerobotics@yahoogroups.com" target="_blank" class="">trianglerobotics@yahoogroups.com</a>> wrote:<br class=""><br class=""><blockquote type="cite" class=""><br class=""><br class="">If you are on the Sparkfun mail list, you probably already got this, but<br class="">this guy is interesting enough to warrant an announcement just in case.<br class=""><br class=""><a href="https://www.sparkfun.com/products/12785" target="_blank" class="">https://www.sparkfun.com/products/12785</a><br class=""><br class="">It is a $24.95 TOF (time of flight) distance sensor - this means that it<br class="">actually measures the amount of time to send light (IR) to and from the<br class="">object, so it is immune from surface reflectivity issues, and also immune<br class="">from many of the problems with ultrasonic sensors.<br class=""><br class="">The only drawback that I see is the relatively short range - 0.5 meters is<br class="">listed in the spec sheet, but if you look at the app note they are<br class="">measuring distance out to almost 2 meters. The actual distance is<br class="">dependent upon ambient light and surface reflection. Note that while the<br class="">maximum dept allowed is dependent upon surface reflection, the actual value<br class="">of the measurement does not.<br class=""><br class="">I will be ordering one of these soon (too bad I did not know about it<br class="">before placing two orders to them just last week).<br class=""><br class="">Take a look at both the datasheet and the appnote.<br class=""><br class=""><br class=""> __._,_.___<br class=""> ------------------------------<br class="">Posted by: Rodney Radford <<a href="mailto:ncgadgetry@gmail.com" target="_blank" class="">ncgadgetry@gmail.com</a>><br class="">------------------------------<br class=""> Reply via web post<br class=""><<a href="https://groups.yahoo.com/neo/groups/trianglerobotics/conversations/messages/5062;_ylc=X3oDMTJwMTFrMzJpBF9TAzk3MzU5NzE0BGdycElkAzM3NTYxODEEZ3Jwc3BJZAMxNzA1MTM3MDc4BG1zZ0lkAzUwNjIEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxNDIzODUxMjg3?act=reply&messageNum=5062" target="_blank" class="">https://groups.yahoo.com/neo/groups/trianglerobotics/conversations/messages/5062;_ylc=X3oDMTJwMTFrMzJpBF9TAzk3MzU5NzE0BGdycElkAzM3NTYxODEEZ3Jwc3BJZAMxNzA1MTM3MDc4BG1zZ0lkAzUwNjIEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxNDIzODUxMjg3?act=reply&messageNum=5062</a>><br class="">? 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Groups]<br class=""><<a href="https://groups.yahoo.com/neo;_ylc=X3oDMTJkbWhwZ29sBF9TAzk3NDc2NTkwBGdycElkAzM3NTYxODEEZ3Jwc3BJZAMxNzA1MTM3MDc4BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxNDIzODUxMjg3" target="_blank" class="">https://groups.yahoo.com/neo;_ylc=X3oDMTJkbWhwZ29sBF9TAzk3NDc2NTkwBGdycElkAzM3NTYxODEEZ3Jwc3BJZAMxNzA1MTM3MDc4BHNlYwNmdHIEc2xrA2dmcARzdGltZQMxNDIzODUxMjg3</a>><br class="">? Privacy <<a href="https://info.yahoo.com/privacy/us/yahoo/groups/details.html" target="_blank" class="">https://info.yahoo.com/privacy/us/yahoo/groups/details.html</a>> ?<br class="">Unsubscribe<br class=""><<a href="http://trianglerobotics-unsubscribe@yahoogroups.com/?subject=Unsubscribe" target="_blank" class="">trianglerobotics-unsubscribe@yahoogroups.com?subject=Unsubscribe</a>> ? Terms<br class="">of Use <<a href="https://info.yahoo.com/legal/us/yahoo/utos/terms/" target="_blank" class="">https://info.yahoo.com/legal/us/yahoo/utos/terms/</a>><br class=""><br class=""> .<br class=""><br class=""> __,_._,___<br class=""><br class=""></blockquote>-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <<a href="http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20150213/bbaa7928/attachment-0001.html" target="_blank" class="">http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20150213/bbaa7928/attachment-0001.html</a>><br class=""><br class="">------------------------------<br class=""><br class="">Message: 2<br class="">Date: Fri, 13 Feb 2015 13:36:12 -0500<br class="">From: Rodney Radford <<a href="mailto:ncgadgetry@gmail.com" target="_blank" class="">ncgadgetry@gmail.com</a>><br class="">To: trianglerobotics <<a href="mailto:trianglerobotics@yahoogroups.com" target="_blank" class="">trianglerobotics@yahoogroups.com</a>><br class="">Cc: TriEmbed Discussion <<a href="mailto:triembed@triembed.org" target="_blank" class="">triembed@triembed.org</a>><br class="">Subject: Re: [TriEmbed] [TAR] New TOF (time of flight) distance sensor<br class=""><span style="white-space:pre-wrap" class=""> </span>from<span style="white-space:pre-wrap" class=""> </span>Sparkfun<br class="">Message-ID:<br class=""><span style="white-space:pre-wrap" class=""> </span><CA+kfaxGLmRAXTDRA200NyiuoV5hDLinY2J_Ng=<a href="mailto:M5N-q9TNZAew@mail.gmail.com" target="_blank" class="">M5N-q9TNZAew@mail.gmail.com</a>><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">Yet an additional followup - while reading the comments on the bare sensor,<br class="">someone mentioned the ST eval board and it is $19.95 and includes an<br class="">arm-cortex-4 processor and USB interface:<br class=""><br class=""><a href="http://www.mouser.com/ProductDetail/STMicroelectronics/EVALKIT-VL6180X/?qs=sGAEpiMZZMvfpQN6QVmrfGjb%252b49cDybCa83Lgq8kEXU%3d" target="_blank" class="">http://www.mouser.com/ProductDetail/STMicroelectronics/EVALKIT-VL6180X/?qs=sGAEpiMZZMvfpQN6QVmrfGjb%252b49cDybCa83Lgq8kEXU%3d</a><br class=""><br class=""><br class="">On Fri, Feb 13, 2015 at 1:21 PM, Randy Farmer <a href="mailto:randy.farmer@gmail.com" target="_blank" class="">randy.farmer@gmail.com</a><br class="">[trianglerobotics] <<a href="mailto:trianglerobotics@yahoogroups.com" target="_blank" class="">trianglerobotics@yahoogroups.com</a>> wrote:<br class=""><br class=""><blockquote type="cite" class=""><br class=""><br class="">Cheaper breakout with just the sensor:<br class=""><br class=""><a href="https://www.sparkfun.com/products/12784" target="_blank" class="">https://www.sparkfun.com/products/12784</a><br class=""><br class=""><br class="">On Fri, Feb 13, 2015 at 1:14 PM, Rodney Radford <a href="mailto:ncgadgetry@gmail.com" target="_blank" class="">ncgadgetry@gmail.com</a><br class="">[trianglerobotics] <<a href="mailto:trianglerobotics@yahoogroups.com" target="_blank" class="">trianglerobotics@yahoogroups.com</a>> wrote:<br class=""><br class=""><blockquote type="cite" class=""><br class=""><br class="">If you are on the Sparkfun mail list, you probably already got this, but<br class="">this guy is interesting enough to warrant an announcement just in case.<br class=""><br class=""><a href="https://www.sparkfun.com/products/12785" target="_blank" class="">https://www.sparkfun.com/products/12785</a><br class=""><br class="">It is a $24.95 TOF (time of flight) distance sensor - this means that it<br class="">actually measures the amount of time to send light (IR) to and from the<br class="">object, so it is immune from surface reflectivity issues, and also immune<br class="">from many of the problems with ultrasonic sensors.<br class=""><br class="">The only drawback that I see is the relatively short range - 0.5 meters<br class="">is listed in the spec sheet, but if you look at the app note they are<br class="">measuring distance out to almost 2 meters. The actual distance is<br class="">dependent upon ambient light and surface reflection. Note that while the<br class="">maximum dept allowed is dependent upon surface reflection, the actual value<br class="">of the measurement does not.<br class=""><br class="">I will be ordering one of these soon (too bad I did not know about it<br class="">before placing two orders to them just last week).<br class=""><br class="">Take a look at both the datasheet and the appnote.<br class=""><br class=""><br class=""><br class=""></blockquote> __._,_.___<br class=""> ------------------------------<br class="">Posted by: Randy Farmer <<a href="mailto:randy.farmer@gmail.com" target="_blank" class="">randy.farmer@gmail.com</a>><br class="">------------------------------<br class=""> Reply via web post<br class=""><<a href="https://groups.yahoo.com/neo/groups/trianglerobotics/conversations/messages/5063;_ylc=X3oDMTJwMDg0a3V0BF9TAzk3MzU5NzE0BGdycElkAzM3NTYxODEEZ3Jwc3BJZAMxNzA1MTM3MDc4BG1zZ0lkAzUwNjMEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxNDIzODUxNjgx?act=reply&messageNum=5063" target="_blank" class="">https://groups.yahoo.com/neo/groups/trianglerobotics/conversations/messages/5063;_ylc=X3oDMTJwMDg0a3V0BF9TAzk3MzU5NzE0BGdycElkAzM3NTYxODEEZ3Jwc3BJZAMxNzA1MTM3MDc4BG1zZ0lkAzUwNjMEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxNDIzODUxNjgx?act=reply&messageNum=5063</a>><br class="">? 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