[TriEmbed] TriEmbed Digest, Vol 39, Issue 19
Chip McClelland
chip at mcclellands.org
Wed Aug 24 20:55:27 CDT 2016
Alex,
VERY COOL! I am definitely going to buy one of these. Two problems:
- the pedestrians are walking perpendicular to the sensor so not as much of a doppler shift
- at 37mA, it is way over my energy budget. I can only afford 2-3mA max.
Still, cool.
Chip
> On Aug 24, 2016, at 6:49 PM, triembed-request at triembed.org wrote:
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> Today's Topics:
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> 1. Re: TriEmbed Digest, Vol 39, Issue 18 (Alex Davis)
> 2. Re: TriEmbed Digest, Vol 39, Issue 18 (Chip McClelland)
>
>
> ----------------------------------------------------------------------
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> Message: 1
> Date: Wed, 24 Aug 2016 13:33:20 -0400
> From: Alex Davis <alexd at matrixwide.com>
> To: triembed at triembed.org
> Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 18
> Message-ID:
> <1472060000.2642054.704996873.58776D1D at webmail.messagingengine.com>
> Content-Type: text/plain; charset="ISO-8859-1"
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>>
>> If you decide to use 38kHz carrier, you will either use a lot of energy
>> or
>> limit your distance.
>> Here's my suggestion:
>> 1. set IR LED's current to 100mA or higher (up to 1A,)
>> 2. send 1us-5us pulses, 10 to 50 per second,
>> 3. use pin interrupt and timer to detect and count missing pulses
>> 4. use lens (LED) and IR filter (detector)
>
> I wonder if you could adapt these cheapo microwave doppler sensors -
> maybe mount them in a 'cantenna' to make them directional?
>
> 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
>
> You've probably got to accept a degree of false positives with those.
>
> Alex
>
>
> --
> "The theater of noise is proof of our potential."
> |\ | (? \/ |?\ |V| |\ ?|? |?) | \/ | | | |?\ (? /? /\ |V|
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> ------------------------------
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> Message: 2
> Date: Wed, 24 Aug 2016 18:32:37 -0700
> From: Chip McClelland <chip at mcclellands.org>
> To: triembed at triembed.org
> Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 18
> Message-ID: <6C64A6AA-A568-45D8-83D1-88C5ED12E091 at mcclellands.org>
> Content-Type: text/plain; charset="utf-8"
>
> Robert and all,
>
> So, here is what I am thinking, please let me know if there is a better way.
>
> 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.
>
> 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.
>
> 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.
>
>
>
> 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.
>
> Thanks,
>
> Chip
>
>
>
>> On Aug 24, 2016, at 10:00 AM, triembed-request at triembed.org wrote:
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>> 1. Re: TriEmbed Digest, Vol 39, Issue 16 (Robert Gasiorowski)
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>> ----------------------------------------------------------------------
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>> Message: 1
>> Date: Tue, 23 Aug 2016 16:16:57 -0400
>> From: Robert Gasiorowski <rgresume at gmail.com>
>> To: Chip McClelland <chip at mcclellands.org>
>> Cc: "triembed at triembed.org" <triembed at triembed.org>
>> Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 16
>> Message-ID:
>> <CAEU50hUQ+S3f4_KTHTAXRCEmMx_tGiuGeb1k61Wq1atiCf12dw at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> If you decide to use 38kHz carrier, you will either use a lot of energy or
>> limit your distance.
>> Here's my suggestion:
>> 1. set IR LED's current to 100mA or higher (up to 1A,)
>> 2. send 1us-5us pulses, 10 to 50 per second,
>> 3. use pin interrupt and timer to detect and count missing pulses
>> 4. use lens (LED) and IR filter (detector)
>>
>> Alternatively, you could use short bursts of 38kHz carrier (also at higher
>> current, but probably not as high as above.) This way, you could use one of
>> Vishay's detectors, which usually come with IR filters.
>>
>> On Tue, Aug 23, 2016 at 1:23 PM, Chip McClelland via TriEmbed <
>> triembed at triembed.org> wrote:
>>
>>> Alex, yes, bought and tested that one. But humans are not reflective sir
>>> only about 12'. Cars to 30' easy so will eventually use it to replace the
>>> pneumatic tubes across the road.
>>>
>>> Bought a matched pair of IR emitter and phototransistor yesterday. Will
>>> see if I can build my own circuit as this seems to be a new and novel
>>> application (!?).
>>>
>>> Thanks, chip
>>>
>>> On Tuesday, August 23, 2016, <triembed-request at triembed.org> wrote:
>>>
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>>>> Today's Topics:
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>>>> 1. Re: TriEmbed Digest, Vol 39, Issue 15 (Alex Davis)
>>>>
>>>>
>>>> ----------------------------------------------------------------------
>>>>
>>>> Message: 1
>>>> Date: Mon, 22 Aug 2016 13:28:21 -0400
>>>> From: Alex Davis <alexd at matrixwide.com>
>>>> To: triembed at triembed.org
>>>> Subject: Re: [TriEmbed] TriEmbed Digest, Vol 39, Issue 15
>>>> Message-ID:
>>>> <1471886901.1337427.702662641.4268E605 at webmail.
>>>> messagingengine.com>
>>>> Content-Type: text/plain; charset="ISO-8859-1"
>>>>
>>>>
>>>>> All, any ideas on a low power (5mA and 3.3-5V) IR beam sensor
>>>>> (transmitter
>>>>> and reflector) I could use in an outdoor setting? Need to count
>>>>> pedestrians walking on a gravel road and the width - 30' - is too great
>>>>> for
>>>>> ultrasonic. Ideally, could buy the sensor components directly and
>>>>> integrate
>>>>> them with my data logger board.
>>>>
>>>> Chip,
>>>>
>>>> looks like this one (https://www.sparkfun.com/products/11724) can be had
>>>> in a 10-meter version, and uses 2.9 mA average, so maybe ultrasonic
>>>> would work.
>>>>
>>>> I think decent-range beam-break is going to take some decent current.
>>>>
>>>> Alex
>>>>
>>>> --
>>>> "The theater of noise is proof of our potential."
>>>> |\ | (? \/ |?\ |V| |\ ?|? |?) | \/ | | | |?\ (? /? /\ |V|
>>>> |-||_ (_ /\ |_/ @| | |-| | | \ | /\ |^| | |_/ (_ . \_ \/ | |
>>>>
>>>> You won't find me on Facebook.
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>>>
>>>
>>> --
>>> Sent from my iPhone - please excuse the typos
>>>
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