[TriEmbed] TriEmbed Digest, Vol 39, Issue 16

[Shane Trent]

Chip,

I have read about LED based long range systems that uses lenses to focus
the beam. If you are going to focus the beam to hit a retro-reflector
target (I wonder if SOLAS tape works better than bicycle type reflectors?).
I would try to test the setup with Red LEDs to get you in the ball park
visually. I suggest using a modulated carrier and an IR receiver that
detects the carrier.

Pololu has some receiver modules that might be handy (fixed and adjustable
gain, not sure which would fit your application better). They also have
modules with a modulator and receiver on one board but it looks like their
low power version use 8 ma. However they are not using retro-reflective
targets. The Pololu IR modules might give you a fast and dirty method to
explore the performance envelope of your proposed setup without requiring
much engineering time.

https://www.pololu.com/blog/272/new-products-vishay-38-khz-ir-detector-modules
https://www.pololu.com/product/2461

Shane

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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>>    1. Re: TriEmbed Digest, Vol 39, Issue 15 (Alex Davis)
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>> ----------------------------------------------------------------------
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>> 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
>>
>> --
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>> End of TriEmbed Digest, Vol 39, Issue 16
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