<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Shane, <div class=""><br class=""></div><div class="">That makes a lot of sense. By looking at a specific time and for a specific carrier frequency (38 kHz), I can better see the signal against the background noise. </div><div class=""><br class=""></div><div class="">So, instead of a phototransistor circuit, I would use an IR receiver sensor such as this one - <a href="http://www.vishay.com/docs/82474/tssp4p38.pdf" class="">http://www.vishay.com/docs/82474/tssp4p38.pdf</a></div><div class=""><br class=""></div><div class="">To reduce the duty cycle, I would only run the 38kHz signal in bursts or 10-12 pulses.</div><div class=""><br class=""></div><div class="">Will check this out.</div><div class=""><br class=""></div><div class="">Chi</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Aug 24, 2016, at 7:58 PM, <a href="mailto:triembed-request@triembed.org" class="">triembed-request@triembed.org</a> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Send TriEmbed mailing list submissions to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><a href="mailto:triembed@triembed.org" class="">triembed@triembed.org</a><br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">or, via email, send a message with subject or body 'help' to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed-request@triembed.org<br class=""><br class="">You can reach the person managing the list at<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed-owner@triembed.org<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: TriEmbed Digest, Vol 39, Issue 19 (Chip McClelland)<br class=""> 2. Re: TriEmbed Digest, Vol 39, Issue 18 (Shane Trent)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Wed, 24 Aug 2016 18:55:27 -0700<br class="">From: Chip McClelland <chip@mcclellands.org><br class="">To: triembed@triembed.org<br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 19<br class="">Message-ID: <F773AEFC-0708-49C4-BD44-D975746435E7@mcclellands.org><br class="">Content-Type: text/plain; charset=us-ascii<br class=""><br class="">Alex, <br class=""><br class="">VERY COOL! I am definitely going to buy one of these. Two problems:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- the pedestrians are walking perpendicular to the sensor so not as much of a doppler shift<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>- at 37mA, it is way over my energy budget. I can only afford 2-3mA max. <br class=""><br class="">Still, cool.<br class=""><br class="">Chip<br class=""><br class=""><br class=""><blockquote type="cite" class="">On Aug 24, 2016, at 6:49 PM, triembed-request@triembed.org wrote:<br class=""><br class="">Send TriEmbed mailing list submissions to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed@triembed.org<br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">or, via email, send a message with subject or body 'help' to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed-request@triembed.org<br class=""><br class="">You can reach the person managing the list at<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed-owner@triembed.org<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: TriEmbed Digest, Vol 39, Issue 18 (Alex Davis)<br class=""> 2. Re: TriEmbed Digest, Vol 39, Issue 18 (Chip McClelland)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Wed, 24 Aug 2016 13:33:20 -0400<br class="">From: Alex Davis <alexd@matrixwide.com><br class="">To: triembed@triembed.org<br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 18<br class="">Message-ID:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><1472060000.2642054.704996873.58776D1D@webmail.messagingengine.com><br class="">Content-Type: text/plain; charset="ISO-8859-1"<br class=""><br class="">tent-Type: text/plain; charset="utf-8"<br class=""><blockquote type="cite" class=""><br class="">If you decide to use 38kHz carrier, you will either use a lot of energy<br class="">or<br class="">limit your distance.<br class="">Here's my suggestion:<br class="">1. set IR LED's current to 100mA or higher (up to 1A,)<br class="">2. send 1us-5us pulses, 10 to 50 per second,<br class="">3. use pin interrupt and timer to detect and count missing pulses<br class="">4. use lens (LED) and IR filter (detector)<br class=""></blockquote><br class="">I wonder if you could adapt these cheapo microwave doppler sensors -<br class="">maybe mount them in a 'cantenna' to make them directional?<br class=""><br class="">http://www.aliexpress.com/item/wholesale-HB100-5pcs-Wireless-Doppler-Radar-Microwave-Motion-Sensor-Module-and-microwave-motion-detector/545656348.html?ws_ab_test=searchweb201556_0,searchweb201602_5_10057_10056_10065_10055_10054_10059_10058_10017_107_10060_10061_10052_414_10062_10053_10050_10051,searchweb201603_7&btsid=f21587b3-a261-46b7-9e49-7bd3216a3d33<br class=""><br class="">You've probably got to accept a degree of false positives with those.<br class=""><br class="">Alex<br class=""><br class=""><br class="">-- <br class="">"The theater of noise is proof of our potential."<br class="">|\ | (? \/ |?\ |V| |\ ?|? |?) | \/ | | | |?\ (? /? /\ |V|<br class="">|-||_ (_ /\ |_/ @| | |-| | | \ | /\ |^| | |_/ (_ . \_ \/ | |<br class=""><br class="">You won't find me on Facebook.<br class=""><br class=""><br class=""><br class="">------------------------------<br class=""><br class="">Message: 2<br class="">Date: Wed, 24 Aug 2016 18:32:37 -0700<br class="">From: Chip McClelland <chip@mcclellands.org><br class="">To: triembed@triembed.org<br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 18<br class="">Message-ID: <6C64A6AA-A568-45D8-83D1-88C5ED12E091@mcclellands.org><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">Robert and all, <br class=""><br class="">So, here is what I am thinking, please let me know if there is a better way.<br class=""><br class="">1) Transmitter - use a LMC555 timer to deliver 10 , 1uSec pulses a second in Astable mode. The data sheet <http://www.ti.com/lit/ds/symlink/lmc555.pdf> for the LMC555 timer says it can handle . This circuit will be turned on and off by the Arduino but that is all no PWM or triggering required. It will drive a 100mA 850nm emitter <http://www.marktechopto.com/pdf/products/datasheet/MTPS8085P_2015-05-07.pdf> with a very focused beam.<br class=""><br class="">2) Receiver - I will use a matched 850nm phototransistor <http://www.vishay.com/docs/81527/bpw77n.pdf> wired as a common emitter amplifier. That way, the received pulse will cause the interrupt pin to go LOW and wake the Arduino. <br class=""><br class="">3) Software, I will create a simple interrupt service routine that will register a pulse and determine how many if any pulses have been missed. I can use a running average smoothing function to get rid of noise so I don?t count a falling leaf.<br class=""><br class=""><br class=""><br class="">I hope I am not missing something. Is there a better way to do this? Will I run into issues with changing ambient light or rain / snow causing problems? Will see but any heads up are appreciated.<br class=""><br class="">Thanks,<br class=""><br class="">Chip<br class=""><br class=""><br class=""><br class=""><blockquote type="cite" class="">On Aug 24, 2016, at 10:00 AM, triembed-request@triembed.org wrote:<br class=""><br class="">Send TriEmbed mailing list submissions to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed@triembed.org<br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">or, via email, send a message with subject or body 'help' to<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed-request@triembed.org<br class=""><br class="">You can reach the person managing the list at<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span>triembed-owner@triembed.org<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: TriEmbed Digest, Vol 39, Issue 16 (Robert Gasiorowski)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Tue, 23 Aug 2016 16:16:57 -0400<br class="">From: Robert Gasiorowski <rgresume@gmail.com><br class="">To: Chip McClelland <chip@mcclellands.org><br class="">Cc: "triembed@triembed.org" <triembed@triembed.org><br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 16<br class="">Message-ID:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><CAEU50hUQ+S3f4_KTHTAXRCEmMx_tGiuGeb1k61Wq1atiCf12dw@mail.gmail.com><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">If you decide to use 38kHz carrier, you will either use a lot of energy or<br class="">limit your distance.<br class="">Here's my suggestion:<br class="">1. set IR LED's current to 100mA or higher (up to 1A,)<br class="">2. send 1us-5us pulses, 10 to 50 per second,<br class="">3. use pin interrupt and timer to detect and count missing pulses<br class="">4. use lens (LED) and IR filter (detector)<br class=""><br class="">Alternatively, you could use short bursts of 38kHz carrier (also at higher<br class="">current, but probably not as high as above.) This way, you could use one of<br class="">Vishay's detectors, which usually come with IR filters.<br class=""><br class="">On Tue, Aug 23, 2016 at 1:23 PM, Chip McClelland via TriEmbed <<br class="">triembed@triembed.org> wrote:<br class=""><br class=""><blockquote type="cite" class="">Alex, yes, bought and tested that one. But humans are not reflective sir<br class="">only about 12'. Cars to 30' easy so will eventually use it to replace the<br class="">pneumatic tubes across the road.<br class=""><br class="">Bought a matched pair of IR emitter and phototransistor yesterday. Will<br class="">see if I can build my own circuit as this seems to be a new and novel<br class="">application (!?).<br class=""><br class="">Thanks, chip<br class=""><br class="">On Tuesday, August 23, 2016, <triembed-request@triembed.org> wrote:<br class=""><br class=""><blockquote type="cite" class="">Send TriEmbed mailing list submissions to<br class=""> triembed@triembed.org<br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">or, via email, send a message with subject or body 'help' to<br class=""> triembed-request@triembed.org<br class=""><br class="">You can reach the person managing the list at<br class=""> triembed-owner@triembed.org<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: TriEmbed Digest, Vol 39, Issue 15 (Alex Davis)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Mon, 22 Aug 2016 13:28:21 -0400<br class="">From: Alex Davis <alexd@matrixwide.com><br class="">To: triembed@triembed.org<br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 15<br class="">Message-ID:<br class=""> <1471886901.1337427.702662641.4268E605@webmail.<br class="">messagingengine.com><br class="">Content-Type: text/plain; charset="ISO-8859-1"<br class=""><br class=""><br class=""><blockquote type="cite" class="">All, any ideas on a low power (5mA and 3.3-5V) IR beam sensor<br class="">(transmitter<br class="">and reflector) I could use in an outdoor setting? Need to count<br class="">pedestrians walking on a gravel road and the width - 30' - is too great<br class="">for<br class="">ultrasonic. Ideally, could buy the sensor components directly and<br class="">integrate<br class="">them with my data logger board.<br class=""></blockquote><br class="">Chip,<br class=""><br class="">looks like this one (https://www.sparkfun.com/products/11724) can be had<br class="">in a 10-meter version, and uses 2.9 mA average, so maybe ultrasonic<br class="">would work.<br class=""><br class="">I think decent-range beam-break is going to take some decent current.<br class=""><br class="">Alex<br class=""><br class="">--<br class="">"The theater of noise is proof of our potential."<br class="">|\ | (? \/ |?\ |V| |\ ?|? |?) | \/ | | | |?\ (? /? /\ |V|<br class="">|-||_ (_ /\ |_/ @| | |-| | | \ | /\ |^| | |_/ (_ . \_ \/ | |<br class=""><br class="">You won't find me on Facebook.<br class=""><br class=""><br class=""><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">TriEmbed mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class=""><br class=""><br class="">------------------------------<br class=""><br class="">End of TriEmbed Digest, Vol 39, Issue 16<br class="">****************************************<br class=""><br class=""></blockquote><br class=""><br class="">--<br class="">Sent from my iPhone - please excuse the typos<br class=""><br class="">_______________________________________________<br class="">Triangle, NC Embedded Computing mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">TriEmbed web site: http://TriEmbed.org<br class=""><br class=""><br class=""></blockquote>-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160823/8522d6a3/attachment-0001.html><br class=""><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">TriEmbed mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class=""><br class=""><br class="">------------------------------<br class=""><br class="">End of TriEmbed Digest, Vol 39, Issue 18<br class="">****************************************<br class=""></blockquote><br class="">-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160824/b9db988b/attachment.html><br class="">-------------- next part --------------<br class="">A non-text attachment was scrubbed...<br class="">Name: Screen Shot 2016-08-24 at 6.28.22 PM.png<br class="">Type: image/png<br class="">Size: 46926 bytes<br class="">Desc: not available<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160824/b9db988b/attachment.png><br class="">-------------- next part --------------<br class="">A non-text attachment was scrubbed...<br class="">Name: Screen Shot 2016-08-24 at 6.27.39 PM.png<br class="">Type: image/png<br class="">Size: 18620 bytes<br class="">Desc: not available<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160824/b9db988b/attachment-0001.png><br class=""><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">TriEmbed mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class=""><br class=""><br class="">------------------------------<br class=""><br class="">End of TriEmbed Digest, Vol 39, Issue 19<br class="">****************************************<br class=""></blockquote><br class=""><br class=""><br class=""><br class="">------------------------------<br class=""><br class="">Message: 2<br class="">Date: Thu, 25 Aug 2016 02:53:58 +0000<br class="">From: Shane Trent <shanedtrent@gmail.com><br class="">To: Chip McClelland <chip@mcclellands.org>, triembed@triembed.org<br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 18<br class="">Message-ID:<br class=""><span class="Apple-tab-span" style="white-space:pre"> </span><CAAFjd3rs3=XRP9sNps_gevNupt=WVxzP3nSLJpQEOPBqQFXTUA@mail.gmail.com><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class="">Chip,<br class=""><br class="">You may have a hard time differentiating your pulses from ambient solar IR.<br class="">And getting the level just right to trigger an interrupt reliability under<br class="">changing solar brightness conditions may be a challenge. Good shielding of<br class="">your receiver will help.<br class=""><br class="">You may need a modulated carrier to help pull your signal from the<br class="">background IR. Some demodulators (IR detector) can lock on to the carrier<br class="">in 10 cycles or so. In theory this means a demodulator could detect a<br class="">packet of 38 kHz pulses that contains 10 pulses and have a total length of<br class="">around 0.26 milliseconds.<br class=""><br class="">So you could gate your 555 timer (or just use a timer on the uController to<br class="">generate the 38 kHz carrier) to generate packets of IR at high current but<br class="">at a low repeat rate and use the output of your demodulator to trigger your<br class="">interrupt. Using a 50% on/off ratio on a 38 kHz carrier you could sample<br class="">your IR optical path for completion at a rate of 1.9 kHz (= 0.5 * 38 kHz /<br class="">10 pulses).<br class=""><br class="">So just figure out how quickly you need to sample to not miss an any<br class="">objects and you are set. So if you decide you can sample at 38 Hz and catch<br class="">everything you want, I believe you would be running at about a 1%<br class="">duty-cycle on your IR emitter.<br class=""><br class="">You would set a timer to fire every 26 milliseconds and generate 10 cycles<br class="">(may want to make it 11 or 12?) of 38 kHz (taking 0.26 milliseconds) and<br class="">after the end of the last pulse check to see for a interrupt from the IR<br class="">detector set the "detected" flag and go back to sleep until the 26<br class="">millisecond timer fires again. Or would that make the LED duty-cycle 0.5%<br class="">since it is only on for half of the 0.26 milliseconds? Anyway you can<br class="">really hammer on the LED since your duty-cycle is so low. And you will sill<br class="">have a low average current on the transmitter.<br class=""><br class="">Shane<br class=""><br class="">On Wed, Aug 24, 2016 at 9:49 PM Chip McClelland via TriEmbed <<br class="">triembed@triembed.org> wrote:<br class=""><br class=""><blockquote type="cite" class="">Robert and all,<br class=""><br class="">So, here is what I am thinking, please let me know if there is a better<br class="">way.<br class=""><br class="">1) Transmitter - use a LMC555 timer to deliver 10 , 1uSec pulses a second<br class="">in Astable mode. The data sheet<br class=""><http://www.ti.com/lit/ds/symlink/lmc555.pdf> for the LMC555 timer says<br class="">it can handle . This circuit will be turned on and off by the Arduino but<br class="">that is all no PWM or triggering required. It will drive a 100mA 850nm<br class="">emitter<br class=""><http://www.marktechopto.com/pdf/products/datasheet/MTPS8085P_2015-05-07.pdf> with<br class="">a very focused beam.<br class=""><br class="">2) Receiver - I will use a matched 850nm phototransistor<br class=""><http://www.vishay.com/docs/81527/bpw77n.pdf> wired as a common emitter<br class="">amplifier. That way, the received pulse will cause the interrupt pin to go<br class="">LOW and wake the Arduino.<br class=""><br class="">3) Software, I will create a simple interrupt service routine that will<br class="">register a pulse and determine how many if any pulses have been missed. I<br class="">can use a running average smoothing function to get rid of noise so I don?t<br class="">count a falling leaf.<br class=""><br class=""><br class="">I hope I am not missing something. Is there a better way to do this?<br class="">Will I run into issues with changing ambient light or rain / snow causing<br class="">problems? Will see but any heads up are appreciated.<br class=""><br class="">Thanks,<br class=""><br class="">Chip<br class=""><br class=""><br class=""><br class="">On Aug 24, 2016, at 10:00 AM, triembed-request@triembed.org wrote:<br class=""><br class="">Send TriEmbed mailing list submissions to<br class="">triembed@triembed.org<br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">or, via email, send a message with subject or body 'help' to<br class="">triembed-request@triembed.org<br class=""><br class="">You can reach the person managing the list at<br class="">triembed-owner@triembed.org<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: TriEmbed Digest, Vol 39, Issue 16 (Robert Gasiorowski)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Tue, 23 Aug 2016 16:16:57 -0400<br class="">From: Robert Gasiorowski <rgresume@gmail.com><br class="">To: Chip McClelland <chip@mcclellands.org><br class="">Cc: "triembed@triembed.org" <triembed@triembed.org><br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 16<br class="">Message-ID:<br class=""><CAEU50hUQ+S3f4_KTHTAXRCEmMx_tGiuGeb1k61Wq1atiCf12dw@mail.gmail.com><br class="">Content-Type: text/plain; charset="utf-8"<br class=""><br class=""><br class=""><br class="">If you decide to use 38kHz carrier, you will either use a lot of energy or<br class="">limit your distance.<br class="">Here's my suggestion:<br class="">1. set IR LED's current to 100mA or higher (up to 1A,)<br class="">2. send 1us-5us pulses, 10 to 50 per second,<br class="">3. use pin interrupt and timer to detect and count missing pulses<br class="">4. use lens (LED) and IR filter (detector)<br class=""><br class="">Alternatively, you could use short bursts of 38kHz carrier (also at higher<br class="">current, but probably not as high as above.) This way, you could use one of<br class="">Vishay's detectors, which usually come with IR filters.<br class=""><br class="">On Tue, Aug 23, 2016 at 1:23 PM, Chip McClelland via TriEmbed <<br class="">triembed@triembed.org> wrote:<br class=""><br class="">Alex, yes, bought and tested that one. But humans are not reflective sir<br class="">only about 12'. Cars to 30' easy so will eventually use it to replace the<br class="">pneumatic tubes across the road.<br class=""><br class="">Bought a matched pair of IR emitter and phototransistor yesterday. Will<br class="">see if I can build my own circuit as this seems to be a new and novel<br class="">application (!?).<br class=""><br class="">Thanks, chip<br class=""><br class="">On Tuesday, August 23, 2016, <triembed-request@triembed.org> wrote:<br class=""><br class="">Send TriEmbed mailing list submissions to<br class=""> triembed@triembed.org<br class=""><br class="">To subscribe or unsubscribe via the World Wide Web, visit<br class=""> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">or, via email, send a message with subject or body 'help' to<br class=""> triembed-request@triembed.org<br class=""><br class="">You can reach the person managing the list at<br class=""> triembed-owner@triembed.org<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: TriEmbed Digest, Vol 39, Issue 15 (Alex Davis)<br class=""><br class=""><br class="">----------------------------------------------------------------------<br class=""><br class="">Message: 1<br class="">Date: Mon, 22 Aug 2016 13:28:21 -0400<br class="">From: Alex Davis <alexd@matrixwide.com><br class="">To: triembed@triembed.org<br class="">Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 15<br class="">Message-ID:<br class=""> <1471886901.1337427.702662641.4268E605@webmail.<br class="">messagingengine.com><br class="">Content-Type: text/plain; charset="ISO-8859-1"<br class=""><br class=""><br class="">All, any ideas on a low power (5mA and 3.3-5V) IR beam sensor<br class="">(transmitter<br class="">and reflector) I could use in an outdoor setting? Need to count<br class="">pedestrians walking on a gravel road and the width - 30' - is too great<br class="">for<br class="">ultrasonic. Ideally, could buy the sensor components directly and<br class="">integrate<br class="">them with my data logger board.<br class=""><br class=""><br class="">Chip,<br class=""><br class="">looks like this one (https://www.sparkfun.com/products/11724) can be had<br class="">in a 10-meter version, and uses 2.9 mA average, so maybe ultrasonic<br class="">would work.<br class=""><br class="">I think decent-range beam-break is going to take some decent current.<br class=""><br class=""><br class=""><br class="">Alex<br class=""><br class="">--<br class="">"The theater of noise is proof of our potential."<br class=""><br class="">|\ | (? \/ |?\ |V| |\ ?|? |?) | \/ | | | |?\ (? /? /\ |V|<br class=""><br class=""><br class="">|-||_ (_ /\ |_/ @| | |-| | | \ | /\ |^| | |_/ (_ . \_ \/ | |<br class=""><br class="">You won't find me on Facebook.<br class=""><br class=""><br class=""><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">TriEmbed mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class=""><br class=""><br class="">------------------------------<br class=""><br class="">End of TriEmbed Digest, Vol 39, Issue 16<br class="">****************************************<br class=""><br class=""><br class=""><br class="">--<br class="">Sent from my iPhone - please excuse the typos<br class=""><br class=""><br class=""><br class="">_______________________________________________<br class="">Triangle, NC Embedded Computing mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">TriEmbed web site: http://TriEmbed.org<br class=""><br class=""><br class="">-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <<br class="">http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160823/8522d6a3/attachment-0001.html<br class=""><blockquote type="cite" class=""><br class=""></blockquote><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">TriEmbed mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class=""><br class=""><br class="">------------------------------<br class=""><br class="">End of TriEmbed Digest, Vol 39, Issue 18<br class="">****************************************<br class=""><br class=""><br class="">_______________________________________________<br class="">Triangle, NC Embedded Computing mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class="">TriEmbed web site: http://TriEmbed.org<br class=""><br class=""></blockquote>-------------- next part --------------<br class="">An HTML attachment was scrubbed...<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160825/d551821d/attachment.html><br class="">-------------- next part --------------<br class="">A non-text attachment was scrubbed...<br class="">Name: Screen Shot 2016-08-24 at 6.28.22 PM.png<br class="">Type: image/png<br class="">Size: 46926 bytes<br class="">Desc: not available<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160825/d551821d/attachment.png><br class="">-------------- next part --------------<br class="">A non-text attachment was scrubbed...<br class="">Name: Screen Shot 2016-08-24 at 6.27.39 PM.png<br class="">Type: image/png<br class="">Size: 18620 bytes<br class="">Desc: not available<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160825/d551821d/attachment-0001.png><br class="">-------------- next part --------------<br class="">A non-text attachment was scrubbed...<br class="">Name: Screen Shot 2016-08-24 at 6.28.22 PM.png<br class="">Type: image/png<br class="">Size: 46926 bytes<br class="">Desc: not available<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160825/d551821d/attachment-0002.png><br class="">-------------- next part --------------<br class="">A non-text attachment was scrubbed...<br class="">Name: Screen Shot 2016-08-24 at 6.27.39 PM.png<br class="">Type: image/png<br class="">Size: 18620 bytes<br class="">Desc: not available<br class="">URL: <http://mail.triembed.org/pipermail/triembed_triembed.org/attachments/20160825/d551821d/attachment-0003.png><br class=""><br class="">------------------------------<br class=""><br class="">Subject: Digest Footer<br class=""><br class="">_______________________________________________<br class="">TriEmbed mailing list<br class="">TriEmbed@triembed.org<br class="">http://mail.triembed.org/mailman/listinfo/triembed_triembed.org<br class=""><br class=""><br class="">------------------------------<br class=""><br class="">End of TriEmbed Digest, Vol 39, Issue 20<br class="">****************************************<br class=""></div></div></blockquote></div><br class=""></div></body></html>